{"id":24631,"date":"2025-11-21T17:36:38","date_gmt":"2025-11-21T17:36:38","guid":{"rendered":"https:\/\/pokecon.jp\/job\/?p=24631"},"modified":"2025-11-21T17:36:38","modified_gmt":"2025-11-21T17:36:38","slug":"ctr%e4%ba%88%e6%b8%ac%e3%81%a7%e3%82%82-target-encoding-%e3%81%af%e5%a4%a7%e4%ba%8b%e3%81%a0%e3%81%a8%e3%81%84%e3%81%86%e8%a9%b1-microad-developers-blog","status":"publish","type":"post","link":"https:\/\/pokecon.jp\/job\/24631\/","title":{"rendered":"CTR\u4e88\u6e2c\u3067\u3082 Target Encoding \u306f\u5927\u4e8b\u3060\u3068\u3044\u3046\u8a71 &#8211; MicroAd Developers Blog"},"content":{"rendered":"\n<\/p>\n<div>\n<p>\u3053\u3093\u306b\u3061\u306f\u3002\u30de\u30a4\u30af\u30ed\u30a2\u30c9\u3067\u6a5f\u68b0\u5b66\u7fd2\u30a8\u30f3\u30b8\u30cb\u30a2\u3092\u3057\u3066\u3044\u308b\u524d\u7530\u3001\u7c00\u6cb3\u539f\u3067\u3059\u3002<\/p>\n<p>\u3053\u306e\u8a18\u4e8b\u3067\u306f\u3001\u30de\u30a4\u30af\u30ed\u30a2\u30c9\u306b\u304a\u3051\u308b Click Through Rate (CTR) \u4e88\u6e2c\u306e\u7cbe\u5ea6\u304a\u3088\u3073\u5b89\u5b9a\u6027\u5411\u4e0a\u306e\u305f\u3081\u306b Target Encoding \u3092\u6d3b\u7528\u3057\u305f\u4e8b\u4f8b\u3092\u7d39\u4ecb\u3057\u307e\u3059\u3002<\/p>\n<p>Real Time Bidding (RTB) \u3067\u306f\u4e0b\u56f3\u306e\u3088\u3046\u306b\u3001\u5e83\u544a\u4e3b\u3068\u30e1\u30c7\u30a3\u30a2\u9593\u3067\u30ea\u30a2\u30eb\u30bf\u30a4\u30e0\u306b\u30aa\u30fc\u30af\u30b7\u30e7\u30f3\u304c\u958b\u50ac\u3055\u308c\u3001\u30aa\u30fc\u30af\u30b7\u30e7\u30f3\u306b\u52dd\u5229\u3057\u305f\u5e83\u544a\u304c\u30e1\u30c7\u30a3\u30a2\u306b\u8868\u793a\u3055\u308c\u307e\u3059\u3002<\/p>\n<p><figure class=\"figure-image figure-image-fotolife\"><span itemscope=\"\" itemtype=\"http:\/\/schema.org\/Photograph\"><img decoding=\"async\" src=\"https:\/\/cdn-ak.f.st-hatena.com\/images\/fotolife\/m\/microad-developers\/20251121\/20251121180008.png\" width=\"638\" height=\"182\" loading=\"lazy\" title=\"\" class=\"hatena-fotolife\" itemprop=\"image\"\/><\/span><figcaption>RTB\u3092\u7c21\u7565\u5316\u3057\u305f\u56f3<\/figcaption><\/figure>\n<\/p>\n<p>\u30de\u30a4\u30af\u30ed\u30a2\u30c9\u3067\u306f\u73fe\u5728\u30aa\u30fc\u30af\u30b7\u30e7\u30f3\u306e\u5165\u672d\u984d\u306f\u6b21\u306e\u3088\u3046\u306b\u4e88\u6e2c CTR \u3068\u76ee\u6a19 CPC (Cost per Click) \u306e\u7a4d\u306b\u4f9d\u5b58\u3059\u308b\u5f62\u3067\u6c7a\u5b9a\u3057\u3066\u3044\u307e\u3059\u3002 <a target=\"_blank\" href=\"http:\/\/www0.cs.ucl.ac.uk\/staff\/w.zhang\/papers\/ortb-kdd.pdf\">Zhang, 2014<\/a><\/p>\n<div align=\"center\"><img decoding=\"async\" src=\"https:\/\/chart.apis.google.com\/chart?cht=tx&amp;chl=%0A%5Ctext%7B%E5%85%A5%E6%9C%AD%E9%A1%8D%7D%20%5Cpropto%20%5Ctext%7B%E7%9B%AE%E6%A8%99%20CPC%7D%20%5Ctimes%20%5Ctext%7B%E4%BA%88%E6%B8%AC%20CTR%7D%0A\" alt=\"&#10;\\text{\u5165\u672d\u984d} \\propto \\text{\u76ee\u6a19 CPC} \\times \\text{\u4e88\u6e2c CTR}&#10;\"\/><\/div>\n<p>CTR \u306f\u5e83\u544a\u304c\u8868\u793a\u3055\u308c\u305f\u3068\u304d\u306b\u30af\u30ea\u30c3\u30af\u3055\u308c\u308b\u78ba\u7387\u3067\u3001 \u904e\u53bb\u306e\u914d\u4fe1\u30ed\u30b0\u304b\u3089\u6a5f\u68b0\u5b66\u7fd2\u30e2\u30c7\u30eb\u3092\u5b66\u7fd2\u3057\u3066\u4e88\u6e2c\u3057\u3066\u3044\u307e\u3059\u3002\u30aa\u30fc\u30af\u30b7\u30e7\u30f3\u306e\u52dd\u7387\u30fb\u914d\u4fe1\u52b9\u679c\u306b\u76f4\u7d50\u3059\u308b\u305f\u3081\u3001\u6b63\u78ba\u306a CTR \u3092\u4e88\u6e2c\u3059\u308b\u3053\u3068\u304c\u6c42\u3081\u3089\u308c\u307e\u3059\u3002<\/p>\n<p>CTR \u4e88\u6e2c\u306b\u95a2\u3059\u308b\u904e\u53bb\u306e\u30de\u30a4\u30af\u30ed\u30a2\u30c9\u306e\u53d6\u308a\u7d44\u307f\u306f\u3053\u3061\u3089<a target=\"_blank\" href=\"#f-a427137a\" id=\"fn-a427137a\" name=\"fn-a427137a\" title=\"https:\/\/developers.microad.co.jp\/entry\/2021\/01\/25\/063000\">*1<\/a><a target=\"_blank\" href=\"#f-c0d3506a\" id=\"fn-c0d3506a\" name=\"fn-c0d3506a\" title=\"https:\/\/developers.microad.co.jp\/entry\/2021\/04\/26\/060000#fn-7f0087c7\">*2<\/a><a target=\"_blank\" href=\"#f-cca06cb0\" id=\"fn-cca06cb0\" name=\"fn-cca06cb0\" title=\"https:\/\/developers.microad.co.jp\/entry\/2021\/04\/26\/060000\">*3<\/a><\/p>\n<p>\u904e\u53bb\u306e\u914d\u4fe1\u30ed\u30b0\u306f\u30c6\u30fc\u30d6\u30eb\u5f62\u5f0f\u306e\u30c7\u30fc\u30bf\u3067\u3001\u5927\u534a\u304c\u5e83\u544aID\u3084\u5e83\u544a\u914d\u4fe1\u5148\u30c9\u30e1\u30a4\u30f3\u306a\u3069\u3068\u3044\u3063\u305f\u30ab\u30c6\u30b4\u30ea\u5909\u6570\u306b\u306a\u3063\u3066\u3044\u307e\u3059\u3002<\/p>\n<p>\u30ab\u30c6\u30b4\u30ea\u5909\u6570\u3092\u591a\u304f\u306e\u6a5f\u68b0\u5b66\u7fd2\u30e2\u30c7\u30eb\u304c\u53d6\u308a\u6271\u3048\u308b\u6570\u5024\u8868\u73fe\u306b\u5909\u63db\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<br \/>\n\u30ab\u30c6\u30b4\u30ea\u5909\u6570\u3092\u6570\u5024\u8868\u73fe\u306b\u5909\u63db\u3059\u308b\u4ee3\u8868\u7684\u306a\u65b9\u6cd5\u306f\u3044\u304f\u3064\u304b\u3042\u308a\u3001One-hot Encoding \u3084 Label Encoding \u306a\u3069\u304c\u3042\u308a\u307e\u3059\u304c\u3053\u3053\u3067\u306f Target Encoding \u3068\u547c\u3070\u308c\u308b\u624b\u6cd5\u306b\u3064\u3044\u3066\u306e\u4e00\u822c\u7684\u306a\u7d39\u4ecb\u3092\u3057\u307e\u3059\u3002<\/p>\n<p>Target Encoding \u306f\u30ab\u30c6\u30b4\u30ea\u30ab\u30eb\u7279\u5fb4\u91cf\u3092\u3001\u305d\u306e\u30ab\u30c6\u30b4\u30ea\u304c\u4e0e\u3048\u3089\u308c\u305f\u3068\u304d\u306e\u76ee\u7684\u5909\u6570\uff08CTR \u4e88\u6e2c\u306a\u3089\u3070\u30af\u30ea\u30c3\u30af\u3057\u305f\u304b\u5426\u304b\uff09\u306e\u5e73\u5747\u5024\u3067\u7f6e\u304d\u63db\u3048\u308b\u624b\u6cd5\u3067\u3059\u3002<\/p>\n<p><a target=\"_blank\" href=\"https:\/\/arxiv.org\/pdf\/1706.09516\">Liudmila et al., 2019<\/a>\u3092\u53c2\u8003\u306b\u3057\u3066\u3084\u3084\u5f62\u5f0f\u3070\u3063\u305f\u8868\u73fe\u3092\u3059\u308b\u3068\u3001\u4ee5\u4e0b\u306e\u901a\u308a\u3067\u3059\u3002<\/p>\n<p>\u30c7\u30fc\u30bf\u30bb\u30c3\u30c8: <img decoding=\"async\" src=\"https:\/\/chart.apis.google.com\/chart?cht=tx&amp;chl=%5Cmathcal%7BD%7D%20%3D%20%7B%28%5Cmathbb%7Bx%7D_%7Bk%7D%2C%20y_%7Bk%7D%29%7D_%7Bk%3D1...n%7D\" alt=\"\\mathcal{D} = {(\\mathbb{x}_{k}, y_{k})}_{k=1...n}\"\/> \u306b\u5bfe\u3057\u3066\u3001<img decoding=\"async\" src=\"https:\/\/chart.apis.google.com\/chart?cht=tx&amp;chl=k\" alt=\"k\"\/> \u756a\u76ee\u306e\u8a13\u7df4\u30c7\u30fc\u30bf\u306b\u304a\u3051\u308b\u30ab\u30c6\u30b4\u30ea\u30ab\u30eb\u7279\u5fb4\u91cf <img decoding=\"async\" src=\"https:\/\/chart.apis.google.com\/chart?cht=tx&amp;chl=i\" alt=\"i\"\/> \u3092 <img decoding=\"async\" src=\"https:\/\/chart.apis.google.com\/chart?cht=tx&amp;chl=x_%7Bk%7D%5E%7Bi%7D\" alt=\"x_{k}^{i}\"\/> \u3068\u3057\u307e\u3059\u3002<br \/>\nTarget Encoding \u306f <img decoding=\"async\" src=\"https:\/\/chart.apis.google.com\/chart?cht=tx&amp;chl=x_%7Bk%7D%5E%7Bi%7D\" alt=\"x_{k}^{i}\"\/> \u3092\u305d\u306e\u30ab\u30c6\u30b4\u30ea\u304c\u4e0e\u3048\u3089\u308c\u305f\u6761\u4ef6\u4e0b\u3067\u306e\u30bf\u30fc\u30b2\u30c3\u30c8\u306b\u95a2\u3059\u308b\u7d71\u8a08\u91cf <img decoding=\"async\" src=\"https:\/\/chart.apis.google.com\/chart?cht=tx&amp;chl=%5Chat%7Bx%7D_%7Bk%7D%5E%7Bi%7D\" alt=\"\\hat{x}_{k}^{i}\"\/> \u3067\u7f6e\u304d\u63db\u3048\u308b\u624b\u6cd5\u3092 Target Encoding \u3068\u547c\u3073\u307e\u3059\u3002<\/p>\n<div align=\"center\"><img decoding=\"async\" src=\"https:\/\/chart.apis.google.com\/chart?cht=tx&amp;chl=%0A%5Chat%7Bx%7D_%7Bk%7D%5E%7Bi%7D%20%5Capprox%20%5Cmathbb%7BE%7D%5By%7Cx%5E%7Bi%7D%20%3D%20x_%7Bk%7D%5E%7Bi%7D%5D.%0A\" alt=\"&#10;\\hat{x}_{k}^{i} \\approx \\mathbb{E}[y|x^{i} = x_{k}^{i}].&#10;\"\/><\/div>\n<p>\u3053\u306e <img decoding=\"async\" src=\"https:\/\/chart.apis.google.com\/chart?cht=tx&amp;chl=%5Cmathbb%7BE%7D%5By%7Cx%5E%7Bi%7D%20%3D%20x_%7Bk%7D%5E%7Bi%7D%5D\" alt=\"\\mathbb{E}[y|x^{i} = x_{k}^{i}]\"\/> \u3092\u3069\u306e\u3088\u3046\u306b\u8a08\u7b97\u3057\u3066\u8fd1\u4f3c\u3059\u308b\u304b\u306b\u3088\u3063\u3066\u3001Target Encoding \u306e\u7a2e\u985e\u304c\u5206\u304b\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n<p>\u4ee5\u4e0b\u3067\u306f\u4ee3\u8868\u7684\u306a Target Encoding \u624b\u6cd5\u3092\u7d39\u4ecb\u3057\u307e\u3059\u3002<\/p>\n<h3 id=\"Greedy-Target-Encoding\">Greedy Target Encoding<\/h3>\n<p>\u81ea\u8eab\u3092\u542b\u3081\u305f\u5168\u3066\u306e\u8a13\u7df4\u30c7\u30fc\u30bf\u3092\u4f7f\u3063\u3066 <img decoding=\"async\" src=\"https:\/\/chart.apis.google.com\/chart?cht=tx&amp;chl=%20%5Chat%7Bx%7D_%7Bk%7D%5E%7Bi%7D\" alt=\" \\hat{x}_{k}^{i}\"\/> \u3092\u8a08\u7b97\u3057\u307e\u3059\u3002<\/p>\n<div align=\"center\"><img decoding=\"async\" src=\"https:\/\/chart.apis.google.com\/chart?cht=tx&amp;chl=%0A%5Chat%7Bx%7D_%7Bk%7D%5E%7Bi%7D%20%3D%20%5Cdfrac%7B%5Csum_%7Bj%3D1%7D%5E%7Bn%7D%5Cmathbb%7B1%7D_%7Bx_%7Bj%7D%5E%7Bi%7D%3Dx_%7Bk%7D%5E%7Bi%7D%20%7D%5Ccdot%20y_%7Bj%7D%20%7D%7B%5Csum_%7Bj%3D1%7D%5E%7Bn%7D%5Cmathbb%7B1%7D_%7Bx_%7Bj%7D%5E%7Bi%7D%3Dx_%7Bk%7D%5E%7Bi%7D%20%7D%20%7D.%0A\" alt=\"&#10;\\hat{x}_{k}^{i} = \\dfrac{\\sum_{j=1}^{n}\\mathbb{1}_{x_{j}^{i}=x_{k}^{i} }\\cdot y_{j} }{\\sum_{j=1}^{n}\\mathbb{1}_{x_{j}^{i}=x_{k}^{i} } }.&#10;\"\/><\/div>\n<p><img decoding=\"async\" src=\"https:\/\/chart.apis.google.com\/chart?cht=tx&amp;chl=x_%7Bk%7D%5E%7Bi%7D\" alt=\"x_{k}^{i}\"\/> \u3068\u540c\u3058\u30ab\u30c6\u30b4\u30ea\u5024\u3092\u6301\u3064\u30c7\u30fc\u30bf\u304c\u5c11\u306a\u3044\u5834\u5408\u306b <img decoding=\"async\" src=\"https:\/\/chart.apis.google.com\/chart?cht=tx&amp;chl=%5Chat%7Bx%7D_%7Bk%7D%5E%7Bi%7D\" alt=\"\\hat{x}_{k}^{i}\"\/> \u304c\u4e0d\u5b89\u5b9a\u306b\u306a\u308b\u306e\u3092\u9632\u3050\u305f\u3081\u306b\u30ca\u30a4\u30fc\u30d6\u306a\u5e73\u5747\u3067\u306f\u306a\u304f\u4e8b\u524d\u5206\u5e03 <img decoding=\"async\" src=\"https:\/\/chart.apis.google.com\/chart?cht=tx&amp;chl=p\" alt=\"p\"\/>\uff08\u57fa\u672c\u7684\u306b\u306f\u30c7\u30fc\u30bf\u30bb\u30c3\u30c8\u5168\u4f53\u306e <img decoding=\"async\" src=\"https:\/\/chart.apis.google.com\/chart?cht=tx&amp;chl=y\" alt=\"y\"\/> \u306e\u5e73\u5747\u5024\uff09\u3092\u7528\u3044\u305f\u30d9\u30a4\u30ba\u5e73\u5747\u3092\u53d6\u308b\u5834\u5408\u304c\u591a\u3044\u3067\u3059\u3002<\/p>\n<div align=\"center\"><img decoding=\"async\" src=\"https:\/\/chart.apis.google.com\/chart?cht=tx&amp;chl=%0A%5Chat%7Bx%7D_%7Bk%7D%5E%7Bi%7D%20%3D%20%5Cdfrac%7B%5Csum_%7Bj%3D1%7D%5E%7Bn%7D%5Cmathbb%7B1%7D_%7Bx_%7Bj%7D%5E%7Bi%7D%3Dx_%7Bk%7D%5E%7Bi%7D%20%7D%5Ccdot%20y_%7Bj%7D%20%2B%20ap%20%7D%7B%5Csum_%7Bj%3D1%7D%5E%7Bn%7D%5Cmathbb%7B1%7D_%7Bx_%7Bj%7D%5E%7Bi%7D%3Dx_%7Bk%7D%5E%7Bi%7D%20%7D%20%2B%20a%20%7D.%0A\" alt=\"&#10;\\hat{x}_{k}^{i} = \\dfrac{\\sum_{j=1}^{n}\\mathbb{1}_{x_{j}^{i}=x_{k}^{i} }\\cdot y_{j} + ap }{\\sum_{j=1}^{n}\\mathbb{1}_{x_{j}^{i}=x_{k}^{i} } + a }.&#10;\"\/><\/div>\n<p>\u6700\u3082\u5358\u7d14\u306a Target Encoding \u3067\u3001\u30ea\u30fc\u30af\u306b\u3088\u308b\u6c4e\u5316\u6027\u80fd\u306e\u4f4e\u4e0b\u3092\u5f15\u304d\u8d77\u3053\u3059\u53ef\u80fd\u6027\u304c\u9ad8\u3044\u305f\u3081\u57fa\u672c\u7684\u306b\u306fNG\u306a\u624b\u6cd5\u3068\u3055\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n<p>\u30a8\u30f3\u30b3\u30fc\u30c9\u7d50\u679c\u306e\u4f8b\u3002<\/p>\n<p>\u30a8\u30f3\u30b3\u30fc\u30c9\u524d<\/p>\n<div class=\"s_table\"><table>\n<thead>\n<tr>\n<th>   <\/th>\n<th> \u5e83\u544a\u30b8\u30e3\u30f3\u30eb <\/th>\n<th>Click<sup id=\"fnref:1\"><a target=\"_blank\" href=\"#fn:1\" rel=\"footnote\">1<\/a><\/sup> <\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td> 1 <\/td>\n<td> \u7f8e\u5bb9   <\/td>\n<td> 0 <\/td>\n<\/tr>\n<tr>\n<td> 2 <\/td>\n<td> \u30a2\u30cb\u30e1\u30fb\u6f2b\u753b   <\/td>\n<td> 1 <\/td>\n<\/tr>\n<tr>\n<td> 3 <\/td>\n<td> \u7f8e\u5bb9   <\/td>\n<td> 1  <\/td>\n<\/tr>\n<tr>\n<td> 4 <\/td>\n<td> \u30a2\u30cb\u30e1\u30fb\u6f2b\u753b   <\/td>\n<td> 0  <\/td>\n<\/tr>\n<tr>\n<td> 5 <\/td>\n<td> \u30a2\u30cb\u30e1\u30fb\u6f2b\u753b   <\/td>\n<td> 1  <\/td>\n<\/tr>\n<\/tbody>\n<\/table><\/div>\n<p>\u30a8\u30f3\u30b3\u30fc\u30c9\u5f8c<\/p>\n<div class=\"s_table\"><table>\n<thead>\n<tr>\n<th>   <\/th>\n<th> \u5e83\u544a\u30b8\u30e3\u30f3\u30eb <\/th>\n<th> Click <\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td> 1 <\/td>\n<td> 0.5  <\/td>\n<td> 0 <\/td>\n<\/tr>\n<tr>\n<td> 2 <\/td>\n<td> 0.666&#8230; <\/td>\n<td> 1 <\/td>\n<\/tr>\n<tr>\n<td> 3 <\/td>\n<td> 0.5  <\/td>\n<td> 1 <\/td>\n<\/tr>\n<tr>\n<td> 4 <\/td>\n<td> 0.666&#8230; <\/td>\n<td> 0  <\/td>\n<\/tr>\n<tr>\n<td> 5 <\/td>\n<td> 0.666&#8230; <\/td>\n<td> 1  <\/td>\n<\/tr>\n<\/tbody>\n<\/table><\/div>\n<p>\u3053\u3053\u3067\u306f <img decoding=\"async\" src=\"https:\/\/chart.apis.google.com\/chart?cht=tx&amp;chl=%5Chat%7Bx%7D_%7Bk%7D%5E%7Bi%7D\" alt=\"\\hat{x}_{k}^{i}\"\/> \u306b <img decoding=\"async\" src=\"https:\/\/chart.apis.google.com\/chart?cht=tx&amp;chl=y_%7Bk%7D\" alt=\"y_{k}\"\/> \u304c\u542b\u307e\u308c\u3066\u3044\u308b\u3053\u3068\u3092\u30ea\u30fc\u30af\u3068\u547c\u3076\u3053\u3068\u306b\u3057\u307e\u3059\u3002<\/p>\n<h3 id=\"Leave-one-out-Target-Encoding\">Leave-one-out Target Encoding<\/h3>\n<p>\u81ea\u8eab\u4ee5\u5916\u306e\u30c7\u30fc\u30bf\u3092\u4f7f\u3063\u3066 Target Encoding \u3092\u884c\u3046\u624b\u6cd5\u3067\u3059\u3002<\/p>\n<div align=\"center\"><img decoding=\"async\" src=\"https:\/\/chart.apis.google.com\/chart?cht=tx&amp;chl=%0A%5Chat%7Bx%7D_%7Bk%7D%5E%7Bi%7D%20%3D%20%5Cdfrac%7Bn%5E%7B%2B%7D%20-%20y_k%20%2B%20ap%7D%7Bn%20-%201%20%2B%20a%7D.%0A\" alt=\"&#10;\\hat{x}_{k}^{i} = \\dfrac{n^{+} - y_k + ap}{n - 1 + a}.&#10;\"\/><\/div>\n<p>\u3053\u3053\u3067<img decoding=\"async\" src=\"https:\/\/chart.apis.google.com\/chart?cht=tx&amp;chl=n%5E%7B%2B%7D%20%3D%20%5Csum_%7Bj%3D1%7D%5E%7Bn%7D%5Cmathbb%7B1%7D_%7Bx_%7Bj%7D%5E%7Bi%7D%3Dx_%7Bk%7D%5E%7Bi%7D%20%7D%5Ccdot%20y_%7Bj%7D%2C%20n%20%3D%20%5Csum_%7Bj%3D1%7D%5E%7Bn%7D%5Cmathbb%7B1%7D_%7Bx_%7Bj%7D%5E%7Bi%7D%3Dx_%7Bk%7D%5E%7Bi%7D%20%7D\" alt=\"n^{+} = \\sum_{j=1}^{n}\\mathbb{1}_{x_{j}^{i}=x_{k}^{i} }\\cdot y_{j}, n = \\sum_{j=1}^{n}\\mathbb{1}_{x_{j}^{i}=x_{k}^{i} }\"\/>.<\/p>\n<p>\u30a8\u30f3\u30b3\u30fc\u30c9\u7d50\u679c\u306e\u4f8b\u3002<\/p>\n<p>\u30a8\u30f3\u30b3\u30fc\u30c9\u524d<\/p>\n<div class=\"s_table\"><table>\n<thead>\n<tr>\n<th>   <\/th>\n<th> \u5e83\u544a\u30b8\u30e3\u30f3\u30eb <\/th>\n<th>Click <\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td> 1 <\/td>\n<td> \u7f8e\u5bb9   <\/td>\n<td> 0 <\/td>\n<\/tr>\n<tr>\n<td> 2 <\/td>\n<td> \u30a2\u30cb\u30e1\u30fb\u6f2b\u753b   <\/td>\n<td> 1 <\/td>\n<\/tr>\n<tr>\n<td> 3 <\/td>\n<td> \u7f8e\u5bb9   <\/td>\n<td> 1  <\/td>\n<\/tr>\n<tr>\n<td> 4 <\/td>\n<td> \u30a2\u30cb\u30e1\u30fb\u6f2b\u753b   <\/td>\n<td> 0  <\/td>\n<\/tr>\n<tr>\n<td> 5 <\/td>\n<td> \u30a2\u30cb\u30e1\u30fb\u6f2b\u753b   <\/td>\n<td> 1  <\/td>\n<\/tr>\n<\/tbody>\n<\/table><\/div>\n<p>\u30a8\u30f3\u30b3\u30fc\u30c9\u5f8c<\/p>\n<div class=\"s_table\"><table>\n<thead>\n<tr>\n<th>   <\/th>\n<th> \u5e83\u544a\u30b8\u30e3\u30f3\u30eb <\/th>\n<th> Click <\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td> 1 <\/td>\n<td> 0  <\/td>\n<td> 0 <\/td>\n<\/tr>\n<tr>\n<td> 2 <\/td>\n<td> 0.5 <\/td>\n<td> 1 <\/td>\n<\/tr>\n<tr>\n<td> 3 <\/td>\n<td> 1  <\/td>\n<td> 1 <\/td>\n<\/tr>\n<tr>\n<td> 4 <\/td>\n<td> 1 <\/td>\n<td> 0  <\/td>\n<\/tr>\n<tr>\n<td> 5 <\/td>\n<td> 0.5 <\/td>\n<td> 1  <\/td>\n<\/tr>\n<\/tbody>\n<\/table><\/div>\n<p>\u81ea\u8eab\u306e\u30e9\u30d9\u30eb\u306e\u60c5\u5831\u3092\u4f7f\u3063\u3066\u3044\u306a\u3044\u305f\u3081\u30ea\u30fc\u30af\u304c\u767a\u751f\u3057\u306a\u3044\u3088\u3046\u306b\u898b\u3048\u307e\u3059\u304c <img decoding=\"async\" src=\"https:\/\/chart.apis.google.com\/chart?cht=tx&amp;chl=%5Chat%7Bx%7D_%7Bk%7D%5E%7Bi%7D\" alt=\"\\hat{x}_{k}^{i}\"\/>\u5185\u306b<img decoding=\"async\" src=\"https:\/\/chart.apis.google.com\/chart?cht=tx&amp;chl=y_k\" alt=\"y_k\"\/> \u304c\u51fa\u73fe\u3057\u3066\u3044\u308b\u305f\u3081\u3001\u5b9f\u969b\u306b\u306f\u30ea\u30fc\u30af\u304c\u767a\u751f\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n<h3 id=\"K-fold-Target-Encoding\">K-fold Target Encoding<\/h3>\n<p>\u30c7\u30fc\u30bf\u30bb\u30c3\u30c8\u3092K\u500b\u306b\u5206\u5272\u3057\u3066\u3001\u4ea4\u5dee\u691c\u8a3c\u306e\u8981\u9818\u3067 Target Encoding \u3092\u884c\u3046\u624b\u6cd5\u3067\u3059\u3002<\/p>\n<div align=\"center\"><img decoding=\"async\" src=\"https:\/\/chart.apis.google.com\/chart?cht=tx&amp;chl=%0A%5Chat%7Bx%7D_%7Bk%7D%5E%7Bi%7D%20%3D%20%5Cdfrac%7Bn%5E%7B%2B%7D%20-%20n_%7BK%7D%5E%7B%2B%7D%20%2B%20ap%7D%7Bn%20-%20n_%7BK%7D%20%2B%20a%7D.%0A\" alt=\"&#10;\\hat{x}_{k}^{i} = \\dfrac{n^{+} - n_{K}^{+} + ap}{n - n_{K} + a}.&#10;\"\/><\/div>\n<p>\u3053\u3053\u3067 <img decoding=\"async\" src=\"https:\/\/chart.apis.google.com\/chart?cht=tx&amp;chl=n_%7BK%7D\" alt=\"n_{K}\"\/> \u306f <img decoding=\"async\" src=\"https:\/\/chart.apis.google.com\/chart?cht=tx&amp;chl=k\" alt=\"k\"\/> \u756a\u76ee\u306e\u30c7\u30fc\u30bf\u3092\u542b\u3080\u5206\u5272\u5f8c\u306e\u30c7\u30fc\u30bf\u6570\u3092\u8868\u3059\u3002<\/p>\n<p>(1, 2) \u3092 <img decoding=\"async\" src=\"https:\/\/chart.apis.google.com\/chart?cht=tx&amp;chl=K%3D1\" alt=\"K=1\"\/> , (3, 4, 5) \u3092 <img decoding=\"async\" src=\"https:\/\/chart.apis.google.com\/chart?cht=tx&amp;chl=K%3D2\" alt=\"K=2\"\/> \u3068\u3057\u3066\u30c7\u30fc\u30bf\u30bb\u30c3\u30c8\u30922\u5206\u5272\u3057\u305f\u3068\u304d\u306e\u30a8\u30f3\u30b3\u30fc\u30c9\u7d50\u679c\u306e\u4f8b<\/p>\n<p>\u30a8\u30f3\u30b3\u30fc\u30c9\u524d<\/p>\n<div class=\"s_table\"><table>\n<thead>\n<tr>\n<th>   <\/th>\n<th> \u5e83\u544a\u30b8\u30e3\u30f3\u30eb <\/th>\n<th>Click <\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td> 1 <\/td>\n<td> \u7f8e\u5bb9   <\/td>\n<td> 0 <\/td>\n<\/tr>\n<tr>\n<td> 2 <\/td>\n<td> \u30a2\u30cb\u30e1\u30fb\u6f2b\u753b   <\/td>\n<td> 1 <\/td>\n<\/tr>\n<tr>\n<td> 3 <\/td>\n<td> \u7f8e\u5bb9   <\/td>\n<td> 1  <\/td>\n<\/tr>\n<tr>\n<td> 4 <\/td>\n<td> \u30a2\u30cb\u30e1\u30fb\u6f2b\u753b   <\/td>\n<td> 0  <\/td>\n<\/tr>\n<tr>\n<td> 5 <\/td>\n<td> \u30a2\u30cb\u30e1\u30fb\u6f2b\u753b   <\/td>\n<td> 1  <\/td>\n<\/tr>\n<\/tbody>\n<\/table><\/div>\n<p>\u30a8\u30f3\u30b3\u30fc\u30c9\u5f8c<\/p>\n<div class=\"s_table\"><table>\n<thead>\n<tr>\n<th>   <\/th>\n<th> \u5e83\u544a\u30b8\u30e3\u30f3\u30eb <\/th>\n<th> Click <\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td> 1 <\/td>\n<td> 1  <\/td>\n<td> 0 <\/td>\n<\/tr>\n<tr>\n<td> 2 <\/td>\n<td> 0.5 <\/td>\n<td> 1 <\/td>\n<\/tr>\n<tr>\n<td> 3 <\/td>\n<td> 0  <\/td>\n<td> 1 <\/td>\n<\/tr>\n<tr>\n<td> 4 <\/td>\n<td> 1 <\/td>\n<td> 0  <\/td>\n<\/tr>\n<tr>\n<td> 5 <\/td>\n<td> 1 <\/td>\n<td> 1  <\/td>\n<\/tr>\n<\/tbody>\n<\/table><\/div>\n<p>Leave-one-out Target Encoding \u3068\u540c\u69d8\u306b\u3001<img decoding=\"async\" src=\"https:\/\/chart.apis.google.com\/chart?cht=tx&amp;chl=n_%7BK%7D\" alt=\"n_{K}\"\/>\u306b\u306f<img decoding=\"async\" src=\"https:\/\/chart.apis.google.com\/chart?cht=tx&amp;chl=y_%7Bk%7D\" alt=\"y_{k}\"\/> \u306e\u60c5\u5831\u304c\u542b\u307e\u308c\u3066\u3044\u308b\u305f\u3081\u3001\u53b3\u5bc6\u306b\u306f\u30ea\u30fc\u30af\u304c\u767a\u751f\u3057\u3066\u3044\u307e\u3059\u3002\u305f\u3060\u3057\u305d\u306e\u5f71\u97ff\u306f Leave-one-out Target Encoding \u3088\u308a\u3082\u5c0f\u3055\u3044\u3068\u3055\u308c\u307e\u3059\u3002<\/p>\n<h3 id=\"Holdout-Target-Encoding\">Holdout Target Encoding<\/h3>\n<p>\u30e2\u30c7\u30eb\u306e\u8a13\u7df4\u30c7\u30fc\u30bf\u30bb\u30c3\u30c8\u3068\u306f\u5225\u306b Target Encoding \u7528\u306e\u30c7\u30fc\u30bf\u30bb\u30c3\u30c8\u3092\u7528\u610f\u3059\u308b\u624b\u6cd5\u3067\u3059\u3002<\/p>\n<p>\u30a8\u30f3\u30b3\u30fc\u30c9\u7528\u30c7\u30fc\u30bf\u30bb\u30c3\u30c8<\/p>\n<div class=\"s_table\"><table>\n<thead>\n<tr>\n<th>   <\/th>\n<th> \u5e83\u544a\u30b8\u30e3\u30f3\u30eb <\/th>\n<th>Click<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td> 1 <\/td>\n<td> \u7f8e\u5bb9  <\/td>\n<td> 0 <\/td>\n<\/tr>\n<tr>\n<td> 2 <\/td>\n<td> \u7f8e\u5bb9  <\/td>\n<td> 0 <\/td>\n<\/tr>\n<tr>\n<td> 3 <\/td>\n<td> \u7f8e\u5bb9  <\/td>\n<td> 1  <\/td>\n<\/tr>\n<tr>\n<td> 4 <\/td>\n<td> \u30a2\u30cb\u30e1\u30fb\u6f2b\u753b   <\/td>\n<td> 0  <\/td>\n<\/tr>\n<tr>\n<td> 5 <\/td>\n<td> \u30a2\u30cb\u30e1\u30fb\u6f2b\u753b   <\/td>\n<td> 1  <\/td>\n<\/tr>\n<\/tbody>\n<\/table><\/div>\n<p>\u4e0a\u8a18\u306e\u30a8\u30f3\u30b3\u30fc\u30c9\u7528\u30c7\u30fc\u30bf\u30bb\u30c3\u30c8\u3092\u4e0e\u3048\u305f\u5834\u5408\u306e\u30a8\u30f3\u30b3\u30fc\u30c9\u7d50\u679c\u306e\u4f8b\u3002<\/p>\n<p>\u30a8\u30f3\u30b3\u30fc\u30c9\u524d<\/p>\n<div class=\"s_table\"><table>\n<thead>\n<tr>\n<th>   <\/th>\n<th> \u5e83\u544a\u30b8\u30e3\u30f3\u30eb <\/th>\n<th>Click[^1] <\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td> 1 <\/td>\n<td> \u7f8e\u5bb9   <\/td>\n<td> 0 <\/td>\n<\/tr>\n<tr>\n<td> 2 <\/td>\n<td> \u30a2\u30cb\u30e1\u30fb\u6f2b\u753b   <\/td>\n<td> 1 <\/td>\n<\/tr>\n<tr>\n<td> 3 <\/td>\n<td> \u7f8e\u5bb9   <\/td>\n<td> 1  <\/td>\n<\/tr>\n<tr>\n<td> 4 <\/td>\n<td> \u30a2\u30cb\u30e1\u30fb\u6f2b\u753b   <\/td>\n<td> 0  <\/td>\n<\/tr>\n<tr>\n<td> 5 <\/td>\n<td> \u30a2\u30cb\u30e1\u30fb\u6f2b\u753b   <\/td>\n<td> 1  <\/td>\n<\/tr>\n<\/tbody>\n<\/table><\/div>\n<p>\u30a8\u30f3\u30b3\u30fc\u30c9\u5f8c<\/p>\n<div class=\"s_table\"><table>\n<thead>\n<tr>\n<th>   <\/th>\n<th> \u5e83\u544a\u30b8\u30e3\u30f3\u30eb <\/th>\n<th> Click <\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td> 1 <\/td>\n<td> 0.33&#8230;  <\/td>\n<td> 0 <\/td>\n<\/tr>\n<tr>\n<td> 2 <\/td>\n<td> 0.5 <\/td>\n<td> 1 <\/td>\n<\/tr>\n<tr>\n<td> 3 <\/td>\n<td> 0.33&#8230;  <\/td>\n<td> 1 <\/td>\n<\/tr>\n<tr>\n<td> 4 <\/td>\n<td> 0.5 <\/td>\n<td> 0  <\/td>\n<\/tr>\n<tr>\n<td> 5 <\/td>\n<td> 0.5 <\/td>\n<td> 1  <\/td>\n<\/tr>\n<\/tbody>\n<\/table><\/div>\n<p>\u30ea\u30fc\u30af\u306f\u767a\u751f\u3057\u307e\u305b\u3093\u304c\u3001\u5b9f\u7528\u4e0a\u306f\u8a13\u7df4\u306b\u4f7f\u7528\u3067\u304d\u308b\u30c7\u30fc\u30bf\u6570\u304c\u5c11\u306a\u304f\u306a\u3063\u3066\u3057\u307e\u3046\u3068\u3044\u3046\u554f\u984c\u3092\u62b1\u3048\u3066\u3044\u307e\u3059\u3002<\/p>\n<h3 id=\"Ordered-Target-Encoding\">Ordered Target Encoding<\/h3>\n<p>\u30c7\u30fc\u30bf\u30bb\u30c3\u30c8\u306b\u4eee\u306e\u6642\u7cfb\u5217\u9806\u5e8f\u3092\u4e0e\u3048\u3001\u81ea\u8eab\u3088\u308a\u904e\u53bb\u306e\u30c7\u30fc\u30bf\u306e\u307f\u3092\u4f7f\u3063\u3066 Target Encoding \u3092\u884c\u3046\u624b\u6cd5\u3067\u3059\u3002<\/p>\n<p>\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u4eee\u306e\u9806\u5e8f\u3092\u4e0e\u3048\u305f\u5834\u5408\u306e\u30a8\u30f3\u30b3\u30fc\u30c9\u7d50\u679c\u306e\u4f8b\u3002<\/p>\n<p>\u30a8\u30f3\u30b3\u30fc\u30c9\u524d<\/p>\n<div class=\"s_table\"><table>\n<thead>\n<tr>\n<th>   <\/th>\n<th> \u4eee\u306e\u9806\u5e8f <\/th>\n<th> \u5e83\u544a\u30b8\u30e3\u30f3\u30eb <\/th>\n<th>Click <\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td> 1 <\/td>\n<td> 0 <\/td>\n<td>\u7f8e\u5bb9   <\/td>\n<td> 0 <\/td>\n<\/tr>\n<tr>\n<td> 2 <\/td>\n<td> 1 <\/td>\n<td>\u30a2\u30cb\u30e1\u30fb\u6f2b\u753b   <\/td>\n<td> 1 <\/td>\n<\/tr>\n<tr>\n<td> 3 <\/td>\n<td> 2 <\/td>\n<td>\u7f8e\u5bb9   <\/td>\n<td> 1  <\/td>\n<\/tr>\n<tr>\n<td> 4 <\/td>\n<td> 3 <\/td>\n<td>\u30a2\u30cb\u30e1\u30fb\u6f2b\u753b   <\/td>\n<td> 0  <\/td>\n<\/tr>\n<tr>\n<td> 5 <\/td>\n<td> 4 <\/td>\n<td>\u30a2\u30cb\u30e1\u30fb\u6f2b\u753b   <\/td>\n<td> 1  <\/td>\n<\/tr>\n<\/tbody>\n<\/table><\/div>\n<p>\u30a8\u30f3\u30b3\u30fc\u30c9\u5f8c<\/p>\n<div class=\"s_table\"><table>\n<thead>\n<tr>\n<th>   <\/th>\n<th> \u4eee\u306e\u9806\u5e8f <\/th>\n<th> \u5e83\u544a\u30b8\u30e3\u30f3\u30eb <\/th>\n<th> Click <\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td> 1 <\/td>\n<td> 0 <\/td>\n<td> &#8211;<sup id=\"fnref:2\"><a target=\"_blank\" href=\"#fn:2\" rel=\"footnote\">2<\/a><\/sup> <\/td>\n<td> 0 <\/td>\n<\/tr>\n<tr>\n<td> 2 <\/td>\n<td> 1 <\/td>\n<td> &#8211; <\/td>\n<td> 1 <\/td>\n<\/tr>\n<tr>\n<td> 3 <\/td>\n<td> 2 <\/td>\n<td> 0  <\/td>\n<td> 1 <\/td>\n<\/tr>\n<tr>\n<td> 4 <\/td>\n<td> 3 <\/td>\n<td> 1 <\/td>\n<td> 0  <\/td>\n<\/tr>\n<tr>\n<td> 5 <\/td>\n<td> 4 <\/td>\n<td> 0.5 <\/td>\n<td> 1  <\/td>\n<\/tr>\n<\/tbody>\n<\/table><\/div>\n<p>\u30ea\u30fc\u30af\u3092\u767a\u751f\u3055\u305b\u305a\u306b\u5168\u3066\u306e\u30c7\u30fc\u30bf\u3092\u8a13\u7df4\u306b\u4f7f\u7528\u3067\u304d\u307e\u3059\u304c\u3001\u82e5\u3044\u9806\u5e8f\u3092\u4e0e\u3048\u3089\u308c\u305f\u30c7\u30fc\u30bf\u306b\u3064\u3044\u3066\u306f Target Encoding \u306e\u7d50\u679c\u304c\u4e0d\u5b89\u5b9a\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<p>\u3053\u306e\u3088\u3046\u306b Target Encoding \u306f\u5f37\u529b\u306a\u624b\u6cd5\u3067\u3059\u304c\u3001\u624b\u6cd5\u306b\u3088\u3063\u3066\u306f\u30ea\u30fc\u30af\u3084\u30a8\u30f3\u30b3\u30fc\u30c9\u7d50\u679c\u306e\u5b89\u5b9a\u6027\u306a\u3069\u306e\u554f\u984c\u304c\u3042\u308b\u305f\u3081\u53d6\u308a\u6271\u3044\u304c\u6bd4\u8f03\u7684\u96e3\u3057\u3044\u30a8\u30f3\u30b3\u30fc\u30c7\u30a3\u30f3\u30b0\u624b\u6cd5\u3068\u3044\u3048\u307e\u3059\u3002<\/p>\n<p>\u3053\u3053\u304b\u3089\u306f Target Encoding \u306e\u6d3b\u7528\u30a4\u30e1\u30fc\u30b8\u3092\u63b4\u3093\u3067\u3082\u3089\u3046\u305f\u3081\u306b\u3001\u30de\u30a4\u30af\u30ed\u30a2\u30c9\u306b\u304a\u3051\u308b\u5b9f\u4e8b\u4f8b\u30921\u3064\u7d39\u4ecb\u3057\u307e\u3059\u3002<\/p>\n<h2 id=\"\u554f\u984c\u8a2d\u5b9a-\u5e83\u544a\u67a0\u306e-Target-Encoding\">\u554f\u984c\u8a2d\u5b9a: \u5e83\u544a\u67a0\u306e Target Encoding<\/h2>\n<p>\u5e83\u544a\u67a0\u3068\u306f\u3001\u30e1\u30c7\u30a3\u30a2\u306b\u8a2d\u7f6e\u3055\u308c\u3066\u3044\u308b\u5e83\u544a\u306e\u8868\u793a\u9818\u57df\u306e\u3053\u3068\u3092\u6307\u3057\u307e\u3059\u3002<br \/>\n\u9001\u3089\u308c\u3066\u304f\u308b\u5165\u672d\u30ea\u30af\u30a8\u30b9\u30c8\u306b\u306f\u5e83\u544a\u67a0\u306e ID \u304c\u542b\u307e\u308c\u3066\u304a\u308a\u3001\u5e83\u544a\u67a0\u3082 CTR \u3092\u6c7a\u5b9a\u4ed8\u3051\u308b1\u3064\u306e\u8981\u7d20\u306a\u306e\u3067\u3001CTR \u4e88\u6e2c\u30e2\u30c7\u30eb\u306e\u7279\u5fb4\u91cf\u3068\u3057\u3066\u6d3b\u7528\u3055\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n<p>\u4e00\u822c\u7684\u306b\u5e83\u544a\u67a0\u306f<\/p>\n<ul>\n<li>\u305d\u306e\u67a0\u304c\u5b58\u5728\u3059\u308b\u30e1\u30c7\u30a3\u30a2\u306e\u6027\u8cea\u3084\u8868\u793a\u4f4d\u7f6e\u306b\u3088\u308a\u3001\u5e73\u5747\u7684\u306a CTR \u306e\u50be\u5411\u5dee\u304c\u3042\u308b (\u5e38\u65e5\u9803\u304b\u3089 CTR \u304c\u9ad8\u3044\u67a0\u3082\u3042\u308c\u3070\u4f4e\u3044\u67a0\u3082\u3042\u308b)<\/li>\n<li>\u9577\u671f\u9593\u5b89\u5b9a\u3057\u3066\u540c\u3058\u5e83\u544a\u67a0\u304b\u3089\u5165\u672d\u30ea\u30af\u30a8\u30b9\u30c8\u304c\u3042\u308b\u308f\u3051\u3067\u306f\u306a\u304f\u3001\u3042\u308b\u65e5\u7a81\u7136\u30aa\u30fc\u30af\u30b7\u30e7\u30f3\u5e02\u5834\u306b\u65b0\u898f\u67a0\u304c\u51fa\u73fe\u3059\u308b\uff08\u9006\u306b\u6d88\u3048\u308b\u3053\u3068\u3082\u3042\u308b\uff09<\/li>\n<\/ul>\n<p>\u306e\u7279\u5fb4\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<p>\u305d\u306e\u305f\u3081\u3001\u5e73\u5747\u7684\u306a CTR \u304b\u3089\u9038\u8131\u3057\u305f\u65b0\u3057\u3044\u67a0\u304c\u51fa\u73fe\u3057\u305f\u5834\u5408\u3001\u305d\u306e\u67a0\u306e\u30ea\u30af\u30a8\u30b9\u30c8\u306b\u3064\u3044\u3066\u4e88\u6e2c CTR \u3068\u771f\u306e CTR \u304c\u4e56\u96e2\u3059\u308b\u3053\u3068\u306b\u3088\u308b\u914d\u4fe1\u52b9\u679c\u306e\u60aa\u5316\u3092\u78ba\u8a8d\u3057\u3066\u3044\u307e\u3057\u305f\u3002<br \/>\n\u4e00\u65b9\u3067\u3001\u6642\u9593\u304c\u7d4c\u904e\u3057\u3055\u3048\u3059\u308c\u3070\u5b9f\u7e3e\uff08\u904e\u53bb\u30ed\u30b0\uff09\u304c\u84c4\u7a4d\u3055\u308c\u3066\u5b66\u7fd2\u30c7\u30fc\u30bf\u30bb\u30c3\u30c8\u306b\u8ffd\u52a0\u3055\u308c\u308b\u305f\u3081\u3001\u5b89\u5b9a\u7684\u306a\u4e88\u6e2c\u304c\u53ef\u80fd\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<p>\u3053\u306e\u3088\u3046\u306a\u80cc\u666f\u304b\u3089\u3001<\/p>\n<ul>\n<li>\u65b0\u898f\u67a0\u306e 0 \u3082\u3057\u304f\u306f\u5c11\u306a\u3044\u5b9f\u7e3e\u306f\u4fe1\u7528\u3057\u306a\u3044\u3002<\/li>\n<li>\u65b0\u898f\u67a0\u306e\u914d\u4fe1\u304c\u5341\u5206\u306b\u51fa\u308c\u3070\u5b9f\u7e3e\u3092\u4fe1\u7528\u3057\u59cb\u3081\u3066\u3082\u826f\u3044\u3002<\/li>\n<\/ul>\n<p>\u3092\u30e2\u30c7\u30eb\u304c\u304d\u3061\u3093\u3068\u89e3\u91c8\u3057\u3066\u6b63\u3057\u3044\u4e88\u6e2c\u304c\u3067\u304d\u308b\u3088\u3046\u306b\u3001\u67a0ID \u3092\u30ab\u30c6\u30b4\u30ea\u5909\u6570\u3068\u3057\u3066\u6271\u3046\u306e\u3067\u306f\u306a\u304f\u3001Target Encoding \u306b\u3088\u308b\u30a8\u30f3\u30b3\u30fc\u30c9\u5024\u3092\u6d3b\u7528\u3059\u308b\u3053\u3068\u306b\u3057\u307e\u3057\u305f\u3002<\/p>\n<h2 id=\"Ordered-Target-Encoding-x-Smoothing\">Ordered Target Encoding x Smoothing<\/h2>\n<p>\u8981\u4ef6\u3092\u6574\u7406\u3059\u308b\u3068\u3001<\/p>\n<ul>\n<li>\u904e\u53bb\u306e\u5b9f\u7e3e\u3092\u57fa\u6e96\u306b\u3059\u308b \u2192 Ordered Target Encoding \u306e\u6d3b\u7528<\/li>\n<li>\u65b0\u898f\u67a0\u306e\u914d\u4fe1\u671f\u9593\u306b\u3088\u3063\u3066\u4fe1\u7528\u5ea6\u3092\u5909\u3048\u305f\u3044 \u2192 Smoothing <sup id=\"fnref:3\"><a target=\"_blank\" href=\"#fn:3\" rel=\"footnote\">3<\/a><\/sup> \u306e\u6d3b\u7528<\/li>\n<\/ul>\n<p>\u304c\u81ea\u7136\u306a\u767a\u60f3\u306b\u306a\u308a\u307e\u3059\u3002<br \/>\n\u6570\u5f0f\u306b\u843d\u3068\u3057\u8fbc\u3080\u3068\u3053\u3046\u3067\u3059:<\/p>\n<div align=\"center\"><img decoding=\"async\" src=\"https:\/\/chart.apis.google.com\/chart?cht=tx&amp;chl=%0A%5Chat%7Bx%7D_k%5Ei%20%3D%20%5Clambda%28n_i%29%20%5Ccdot%20%5Ctext%7BCTR%7D%5Ei_%5Ctext%7BLOCAL%7D%20%2B%20%281%20-%20%5Clambda%28n_i%29%29%20%5Ccdot%20%5Ctext%7BCTR%7D_%5Ctext%7BGLOBAL%7D%20%5C%5C%0A%20%20%20%20%5Ctext%7Bwhere%7D%5C%2C%5C%2C%5C%2C%20%5Clambda%28n%29%20%3D%201%20%2F%20%281%20%2B%20%5Cexp%28-%20%5Cfrac%7Bn-k%7D%7Bf%7D%29%29%20%5Cin%20%5B0%2C%201%5D.%0A\" alt=\"&#10;\\hat{x}_k^i = \\lambda(n_i) \\cdot \\text{CTR}^i_\\text{LOCAL} + (1 - \\lambda(n_i)) \\cdot \\text{CTR}_\\text{GLOBAL} \\\\&#10;    \\text{where}\\,\\,\\, \\lambda(n) = 1 \/ (1 + \\exp(- \\frac{n-k}{f})) \\in [0, 1].&#10;\"\/><\/div>\n<p>\u3055\u3066\u3001\u6570\u5f0f\u306e\u89e3\u8aac\u3067\u3059\u304c\u3001<\/p>\n<p>\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<h3 id=\"\u30cf\u30a4\u30d1\u30fc\u30d1\u30e9\u30e1\u30fc\u30bf\u306e\u6c7a\u5b9a\">\u30cf\u30a4\u30d1\u30fc\u30d1\u30e9\u30e1\u30fc\u30bf\u306e\u6c7a\u5b9a<\/h3>\n<p>\u4fe1\u983c\u95a2\u6570 $\\lambda(n)$ \u306f\u3001\u305d\u306e\u5b9a\u7fa9\u304b\u3089\u3001<\/p>\n<ul>\n<li><img decoding=\"async\" src=\"https:\/\/chart.apis.google.com\/chart?cht=tx&amp;chl=k\" alt=\"k\"\/>: \u4fe1\u983c\u3059\u308b\u306b\u306f\u6700\u4f4e\u9650\u3069\u308c\u304f\u3089\u3044\u306e\u5b9f\u7e3e\u78ba\u8a8d\u6642\u9593 <img decoding=\"async\" src=\"https:\/\/chart.apis.google.com\/chart?cht=tx&amp;chl=n\" alt=\"n\"\/> \u304c\u5fc5\u8981\u304b<\/li>\n<li><img decoding=\"async\" src=\"https:\/\/chart.apis.google.com\/chart?cht=tx&amp;chl=f\" alt=\"f\"\/>: \u4fe1\u983c\u5ea6 0 \u2192 1 \u306e\u5d16\u3092\u30cf\u30fc\u30c9\u306b\u3059\u308b\u304b\u30bd\u30d5\u30c8\u306b\u3059\u308b\u304b<\/li>\n<\/ul>\n<p>\u3092\u5236\u5fa1\u3067\u304d\u307e\u3059\u3002\u6700\u9069\u306a <img decoding=\"async\" src=\"https:\/\/chart.apis.google.com\/chart?cht=tx&amp;chl=k%2C%20f\" alt=\"k, f\"\/> \u306e\u9078\u629e\u3084\u305d\u306e\u65b9\u6cd5\u306f\u30bf\u30b9\u30af\u306b\u3088\u3063\u3066\u7570\u306a\u308a\u307e\u3059\u304c\u3001\u4eca\u56de\u306f\u7d4c\u9a13\u7684\u306b <img decoding=\"async\" src=\"https:\/\/chart.apis.google.com\/chart?cht=tx&amp;chl=k%2C%20f\" alt=\"k, f\"\/> \u3092\u6c7a\u3081\u305f\u4e0a\u3067\u306e\u30b0\u30ea\u30c3\u30c9\u30b5\u30fc\u30c1\u3067\u6c7a\u5b9a\u3057\u307e\u3057\u305f\u3002<\/p>\n<p><span itemscope=\"\" itemtype=\"http:\/\/schema.org\/Photograph\"><img decoding=\"async\" src=\"https:\/\/cdn-ak.f.st-hatena.com\/images\/fotolife\/m\/microad-developers\/20251121\/20251121180010.png\" width=\"800\" height=\"800\" loading=\"lazy\" title=\"\" class=\"hatena-fotolife\" itemprop=\"image\"\/><\/span><\/p>\n<h3 id=\"CTR\u4e88\u6e2c\u306e\u6539\u5584\">CTR\u4e88\u6e2c\u306e\u6539\u5584<\/h3>\n<p>\u3053\u306e\u6539\u5584\u65bd\u7b56\u306f\u65e2\u306b\u5b89\u5b9a\u7248\u3068\u3057\u3066\u5e83\u544a\u914d\u4fe1\u306b\u6d3b\u7528\u3055\u308c\u3066\u304a\u308a\u3001<\/p>\n<ul>\n<li>\u78ba\u8a8d\u3055\u308c\u3066\u3044\u305f\u65b0\u898f\u67a0\u306b\u5bfe\u3059\u308b\u554f\u984c\u304c\u76ee\u7acb\u305f\u306a\u304f\u306a\u3063\u305f<\/li>\n<li>\u914d\u4fe1\u52b9\u679c\u306e\u6539\u5584: \u6700\u5927\u3067 CTR \u306f +5% \u306e\u6539\u5584\u3001CPC (\u30b3\u30b9\u30c8\u5358\u4fa1) \u306f 1% \u306e\u524a\u6e1b<\/li>\n<\/ul>\n<p>\u3092\u78ba\u8a8d\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n<p><strong>\u6a5f\u68b0\u5b66\u7fd2\u30a8\u30f3\u30b8\u30cb\u30a2\u7d76\u8cdb\u63a1\u7528\u4e2d<\/strong><\/p>\n<p>\u6700\u5f8c\u306b\u3001\u30de\u30a4\u30af\u30ed\u30a2\u30c9\u3067\u306f\u554f\u984c\u8a2d\u5b9a\u304b\u3089\u30b5\u30fc\u30d9\u30a4\u3001\u958b\u767a\u30fb\u904b\u7528\u307e\u3067\u88c1\u91cf\u3092\u6301\u3063\u3066\u30c1\u30e3\u30ec\u30f3\u30b8\u3057\u305f\u3044\u3068\u3044\u3046\u6a5f\u68b0\u5b66\u7fd2\u30a8\u30f3\u30b8\u30cb\u30a2\u3092\u52df\u96c6\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n<p>\u3054\u8208\u5473\u3042\u308c\u3070\u662f\u975e\u4ee5\u4e0b\u306e\u63a1\u7528\u30da\u30fc\u30b8\u304b\u3089\u3054\u5fdc\u52df\u304f\u3060\u3055\u3044\uff01<\/p>\n<p><iframe src=\"https:\/\/hatenablog-parts.com\/embed?url=https%3A%2F%2Frecruit.microad.co.jp%2F\" title=\"\u682a\u5f0f\u4f1a\u793e\u30de\u30a4\u30af\u30ed\u30a2\u30c9\u63a1\u7528\u30b5\u30a4\u30c8 | \u30de\u30a4\u30af\u30ed\u30a2\u30c9\u306f\u3001\u300c\u30c7\u30fc\u30bf\u300d\u3068\u300c\u30c6\u30af\u30ce\u30ed\u30b8\u30fc\u300d\u3092\u99c6\u4f7f\u3057\u3066\u3001\u30de\u30fc\u30b1\u30c6\u30a3\u30f3\u30b0\u306e\u5909\u9769\u3092\u76ee\u6307\u3059\u30c7\u30fc\u30bf\u30d7\u30e9\u30c3\u30c8\u30d5\u30a9\u30fc\u30e0\u4e8b\u696d\u3092\u5c55\u958b\u3057\u3066\u304a\u308a\u307e\u3059\u3002\u79c1\u305f\u3061\u306f\u65b0\u3057\u3044\u7523\u696d\u3092\u4e00\u7dd2\u306b\u5275\u308b\u4ef2\u9593\u3092\u52df\u96c6\u3057\u3066\u3044\u307e\u3059\u3002\" class=\"embed-card embed-webcard\" scrolling=\"no\" frameborder=\"0\" style=\"display: block; width: 100%; height: 155px; max-width: 500px; margin: 10px 0px;\" loading=\"lazy\"><\/iframe><cite class=\"hatena-citation\"><a target=\"_blank\" href=\"https:\/\/recruit.microad.co.jp\/\">recruit.microad.co.jp<\/a><\/cite><\/p>\n<p><strong>\u53c2\u8003\u6587\u732e<\/strong><\/p>\n<p><a target=\"_blank\" href=\"http:\/\/www0.cs.ucl.ac.uk\/staff\/w.zhang\/papers\/ortb-kdd.pdf\">Optimal Real-Time Bidding for Display Advertising, Zhang, 2014<\/a><\/p>\n<p><a target=\"_blank\" href=\"https:\/\/arxiv.org\/pdf\/1706.09516\">CatBoost: unbiased boosting with categorical features, Liudmila et al., 2019<\/a><\/p>\n<p><a target=\"_blank\" href=\"https:\/\/doi.org\/10.1145\/507533.507538\">A preprocessing scheme for high-cardinality categorical attributes in classification and prediction problems, Daniele Micci-Barreca, 2001<\/a><\/p>\n<\/div>\n<p><script>(function(d, s, id) {\n  var js, fjs = d.getElementsByTagName(s)[0];\n  if (d.getElementById(id)) return;\n  js = d.createElement(s); js.id = id;\n  js.src = \"\/\/connect.facebook.net\/ja_JP\/sdk.js#xfbml=1&appId=719729204785177&version=v17.0\";\n  fjs.parentNode.insertBefore(js, fjs);\n}(document, 'script', 'facebook-jssdk'));<\/script><br \/>\n<br \/>\n<br \/><a href=\"https:\/\/developers.microad.co.jp\/entry\/2025\/11\/21\/180000\">\u5143\u306e\u8a18\u4e8b\u3092\u78ba\u8a8d\u3059\u308b <\/a><\/p>\n","protected":false},"excerpt":{"rendered":"\u3053\u3093\u306b\u3061\u306f\u3002\u30de\u30a4\u30af\u30ed\u30a2\u30c9\u3067\u6a5f\u68b0\u5b66\u7fd2\u30a8\u30f3\u30b8\u30cb\u30a2\u3092\u3057\u3066\u3044\u308b\u524d\u7530\u3001\u7c00\u6cb3\u539f\u3067\u3059\u3002 \u3053\u306e\u8a18\u4e8b\u3067\u306f\u3001\u30de\u30a4\u30af\u30ed\u30a2\u30c9\u306b\u304a\u3051\u308b Click Through Rate (CTR) \u4e88\u6e2c\u306e\u7cbe\u5ea6\u304a\u3088\u3073\u5b89\u5b9a\u6027\u5411\u4e0a\u306e\u305f\u3081\u306b Target Encod [&hellip;]","protected":false},"author":1,"featured_media":24632,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[4],"tags":[],"class_list":["post-24631","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-company-tec"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.6 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>CTR\u4e88\u6e2c\u3067\u3082 Target Encoding \u306f\u5927\u4e8b\u3060\u3068\u3044\u3046\u8a71 - MicroAd Developers Blog - \u30dd\u30b1\u30b3\u30f3<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/developers.microad.co.jp\/entry\/2025\/11\/21\/180000\" \/>\n<meta property=\"og:locale\" content=\"ja_JP\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"CTR\u4e88\u6e2c\u3067\u3082 Target Encoding \u306f\u5927\u4e8b\u3060\u3068\u3044\u3046\u8a71 - MicroAd Developers Blog - \u30dd\u30b1\u30b3\u30f3\" \/>\n<meta property=\"og:description\" content=\"\u3053\u3093\u306b\u3061\u306f\u3002\u30de\u30a4\u30af\u30ed\u30a2\u30c9\u3067\u6a5f\u68b0\u5b66\u7fd2\u30a8\u30f3\u30b8\u30cb\u30a2\u3092\u3057\u3066\u3044\u308b\u524d\u7530\u3001\u7c00\u6cb3\u539f\u3067\u3059\u3002 \u3053\u306e\u8a18\u4e8b\u3067\u306f\u3001\u30de\u30a4\u30af\u30ed\u30a2\u30c9\u306b\u304a\u3051\u308b Click Through Rate (CTR) \u4e88\u6e2c\u306e\u7cbe\u5ea6\u304a\u3088\u3073\u5b89\u5b9a\u6027\u5411\u4e0a\u306e\u305f\u3081\u306b Target Encod [&hellip;]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/developers.microad.co.jp\/entry\/2025\/11\/21\/180000\" \/>\n<meta property=\"og:site_name\" content=\"\u30dd\u30b1\u30b3\u30f3\" \/>\n<meta property=\"article:published_time\" content=\"2025-11-21T17:36:38+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/pokecon.jp\/job\/wp-content\/uploads\/2025\/11\/https3A2F2Fcdn-ak.f.st-hatena.com2Fimages2Ffotolife2Fm2Fmicroad-developers2F202511172F20251.png\" \/>\n\t<meta property=\"og:image:width\" content=\"1300\" \/>\n\t<meta property=\"og:image:height\" content=\"683\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/png\" \/>\n<meta name=\"author\" content=\"info@pokecon.jp\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\u57f7\u7b46\u8005\" \/>\n\t<meta name=\"twitter:data1\" content=\"info@pokecon.jp\" \/>\n\t<meta name=\"twitter:label2\" content=\"\u63a8\u5b9a\u8aad\u307f\u53d6\u308a\u6642\u9593\" \/>\n\t<meta name=\"twitter:data2\" content=\"1\u5206\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/developers.microad.co.jp\\\/entry\\\/2025\\\/11\\\/21\\\/180000#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/pokecon.jp\\\/job\\\/24631\\\/\"},\"author\":{\"name\":\"info@pokecon.jp\",\"@id\":\"https:\\\/\\\/pokecon.jp\\\/job\\\/#\\\/schema\\\/person\\\/16c9f07b1ba984d165d9aee259bda997\"},\"headline\":\"CTR\u4e88\u6e2c\u3067\u3082 Target Encoding \u306f\u5927\u4e8b\u3060\u3068\u3044\u3046\u8a71 &#8211; MicroAd Developers Blog\",\"datePublished\":\"2025-11-21T17:36:38+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/pokecon.jp\\\/job\\\/24631\\\/\"},\"wordCount\":163,\"image\":{\"@id\":\"https:\\\/\\\/developers.microad.co.jp\\\/entry\\\/2025\\\/11\\\/21\\\/180000#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/pokecon.jp\\\/job\\\/wp-content\\\/uploads\\\/2025\\\/11\\\/https3A2F2Fcdn-ak.f.st-hatena.com2Fimages2Ffotolife2Fm2Fmicroad-developers2F202511172F20251.png\",\"articleSection\":[\"\u4f01\u696d\u30c6\u30c3\u30af\"],\"inLanguage\":\"ja\"},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/pokecon.jp\\\/job\\\/24631\\\/\",\"url\":\"https:\\\/\\\/developers.microad.co.jp\\\/entry\\\/2025\\\/11\\\/21\\\/180000\",\"name\":\"CTR\u4e88\u6e2c\u3067\u3082 Target Encoding \u306f\u5927\u4e8b\u3060\u3068\u3044\u3046\u8a71 - MicroAd Developers Blog - \u30dd\u30b1\u30b3\u30f3\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/pokecon.jp\\\/job\\\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\\\/\\\/developers.microad.co.jp\\\/entry\\\/2025\\\/11\\\/21\\\/180000#primaryimage\"},\"image\":{\"@id\":\"https:\\\/\\\/developers.microad.co.jp\\\/entry\\\/2025\\\/11\\\/21\\\/180000#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/pokecon.jp\\\/job\\\/wp-content\\\/uploads\\\/2025\\\/11\\\/https3A2F2Fcdn-ak.f.st-hatena.com2Fimages2Ffotolife2Fm2Fmicroad-developers2F202511172F20251.png\",\"datePublished\":\"2025-11-21T17:36:38+00:00\",\"author\":{\"@id\":\"https:\\\/\\\/pokecon.jp\\\/job\\\/#\\\/schema\\\/person\\\/16c9f07b1ba984d165d9aee259bda997\"},\"breadcrumb\":{\"@id\":\"https:\\\/\\\/developers.microad.co.jp\\\/entry\\\/2025\\\/11\\\/21\\\/180000#breadcrumb\"},\"inLanguage\":\"ja\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\\\/\\\/developers.microad.co.jp\\\/entry\\\/2025\\\/11\\\/21\\\/180000\"]}]},{\"@type\":\"ImageObject\",\"inLanguage\":\"ja\",\"@id\":\"https:\\\/\\\/developers.microad.co.jp\\\/entry\\\/2025\\\/11\\\/21\\\/180000#primaryimage\",\"url\":\"https:\\\/\\\/pokecon.jp\\\/job\\\/wp-content\\\/uploads\\\/2025\\\/11\\\/https3A2F2Fcdn-ak.f.st-hatena.com2Fimages2Ffotolife2Fm2Fmicroad-developers2F202511172F20251.png\",\"contentUrl\":\"https:\\\/\\\/pokecon.jp\\\/job\\\/wp-content\\\/uploads\\\/2025\\\/11\\\/https3A2F2Fcdn-ak.f.st-hatena.com2Fimages2Ffotolife2Fm2Fmicroad-developers2F202511172F20251.png\",\"width\":1300,\"height\":683},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\\\/\\\/developers.microad.co.jp\\\/entry\\\/2025\\\/11\\\/21\\\/180000#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"\u30db\u30fc\u30e0\",\"item\":\"https:\\\/\\\/pokecon.jp\\\/job\\\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"CTR\u4e88\u6e2c\u3067\u3082 Target Encoding \u306f\u5927\u4e8b\u3060\u3068\u3044\u3046\u8a71 &#8211; MicroAd Developers Blog\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\\\/\\\/pokecon.jp\\\/job\\\/#website\",\"url\":\"https:\\\/\\\/pokecon.jp\\\/job\\\/\",\"name\":\"\u30dd\u30b1\u30b3\u30f3\",\"description\":\"\",\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\\\/\\\/pokecon.jp\\\/job\\\/?s={search_term_string}\"},\"query-input\":{\"@type\":\"PropertyValueSpecification\",\"valueRequired\":true,\"valueName\":\"search_term_string\"}}],\"inLanguage\":\"ja\"},{\"@type\":\"Person\",\"@id\":\"https:\\\/\\\/pokecon.jp\\\/job\\\/#\\\/schema\\\/person\\\/16c9f07b1ba984d165d9aee259bda997\",\"name\":\"info@pokecon.jp\",\"image\":{\"@type\":\"ImageObject\",\"inLanguage\":\"ja\",\"@id\":\"https:\\\/\\\/secure.gravatar.com\\\/avatar\\\/2b0549cd9f7907c092ca5fbb283baf72337f235726e4b46fa39ec0b701ac2fe2?s=96&d=wavatar&r=g\",\"url\":\"https:\\\/\\\/secure.gravatar.com\\\/avatar\\\/2b0549cd9f7907c092ca5fbb283baf72337f235726e4b46fa39ec0b701ac2fe2?s=96&d=wavatar&r=g\",\"contentUrl\":\"https:\\\/\\\/secure.gravatar.com\\\/avatar\\\/2b0549cd9f7907c092ca5fbb283baf72337f235726e4b46fa39ec0b701ac2fe2?s=96&d=wavatar&r=g\",\"caption\":\"info@pokecon.jp\"},\"url\":\"https:\\\/\\\/pokecon.jp\\\/job\\\/author\\\/infopokecon-jp\\\/\"}]}<\/script>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"CTR\u4e88\u6e2c\u3067\u3082 Target Encoding \u306f\u5927\u4e8b\u3060\u3068\u3044\u3046\u8a71 - MicroAd Developers Blog - \u30dd\u30b1\u30b3\u30f3","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/developers.microad.co.jp\/entry\/2025\/11\/21\/180000","og_locale":"ja_JP","og_type":"article","og_title":"CTR\u4e88\u6e2c\u3067\u3082 Target Encoding \u306f\u5927\u4e8b\u3060\u3068\u3044\u3046\u8a71 - MicroAd Developers Blog - \u30dd\u30b1\u30b3\u30f3","og_description":"\u3053\u3093\u306b\u3061\u306f\u3002\u30de\u30a4\u30af\u30ed\u30a2\u30c9\u3067\u6a5f\u68b0\u5b66\u7fd2\u30a8\u30f3\u30b8\u30cb\u30a2\u3092\u3057\u3066\u3044\u308b\u524d\u7530\u3001\u7c00\u6cb3\u539f\u3067\u3059\u3002 \u3053\u306e\u8a18\u4e8b\u3067\u306f\u3001\u30de\u30a4\u30af\u30ed\u30a2\u30c9\u306b\u304a\u3051\u308b Click Through Rate (CTR) \u4e88\u6e2c\u306e\u7cbe\u5ea6\u304a\u3088\u3073\u5b89\u5b9a\u6027\u5411\u4e0a\u306e\u305f\u3081\u306b Target Encod [&hellip;]","og_url":"https:\/\/developers.microad.co.jp\/entry\/2025\/11\/21\/180000","og_site_name":"\u30dd\u30b1\u30b3\u30f3","article_published_time":"2025-11-21T17:36:38+00:00","og_image":[{"width":1300,"height":683,"url":"https:\/\/pokecon.jp\/job\/wp-content\/uploads\/2025\/11\/https3A2F2Fcdn-ak.f.st-hatena.com2Fimages2Ffotolife2Fm2Fmicroad-developers2F202511172F20251.png","type":"image\/png"}],"author":"info@pokecon.jp","twitter_card":"summary_large_image","twitter_misc":{"\u57f7\u7b46\u8005":"info@pokecon.jp","\u63a8\u5b9a\u8aad\u307f\u53d6\u308a\u6642\u9593":"1\u5206"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"Article","@id":"https:\/\/developers.microad.co.jp\/entry\/2025\/11\/21\/180000#article","isPartOf":{"@id":"https:\/\/pokecon.jp\/job\/24631\/"},"author":{"name":"info@pokecon.jp","@id":"https:\/\/pokecon.jp\/job\/#\/schema\/person\/16c9f07b1ba984d165d9aee259bda997"},"headline":"CTR\u4e88\u6e2c\u3067\u3082 Target Encoding \u306f\u5927\u4e8b\u3060\u3068\u3044\u3046\u8a71 &#8211; MicroAd Developers Blog","datePublished":"2025-11-21T17:36:38+00:00","mainEntityOfPage":{"@id":"https:\/\/pokecon.jp\/job\/24631\/"},"wordCount":163,"image":{"@id":"https:\/\/developers.microad.co.jp\/entry\/2025\/11\/21\/180000#primaryimage"},"thumbnailUrl":"https:\/\/pokecon.jp\/job\/wp-content\/uploads\/2025\/11\/https3A2F2Fcdn-ak.f.st-hatena.com2Fimages2Ffotolife2Fm2Fmicroad-developers2F202511172F20251.png","articleSection":["\u4f01\u696d\u30c6\u30c3\u30af"],"inLanguage":"ja"},{"@type":"WebPage","@id":"https:\/\/pokecon.jp\/job\/24631\/","url":"https:\/\/developers.microad.co.jp\/entry\/2025\/11\/21\/180000","name":"CTR\u4e88\u6e2c\u3067\u3082 Target Encoding \u306f\u5927\u4e8b\u3060\u3068\u3044\u3046\u8a71 - MicroAd Developers Blog - \u30dd\u30b1\u30b3\u30f3","isPartOf":{"@id":"https:\/\/pokecon.jp\/job\/#website"},"primaryImageOfPage":{"@id":"https:\/\/developers.microad.co.jp\/entry\/2025\/11\/21\/180000#primaryimage"},"image":{"@id":"https:\/\/developers.microad.co.jp\/entry\/2025\/11\/21\/180000#primaryimage"},"thumbnailUrl":"https:\/\/pokecon.jp\/job\/wp-content\/uploads\/2025\/11\/https3A2F2Fcdn-ak.f.st-hatena.com2Fimages2Ffotolife2Fm2Fmicroad-developers2F202511172F20251.png","datePublished":"2025-11-21T17:36:38+00:00","author":{"@id":"https:\/\/pokecon.jp\/job\/#\/schema\/person\/16c9f07b1ba984d165d9aee259bda997"},"breadcrumb":{"@id":"https:\/\/developers.microad.co.jp\/entry\/2025\/11\/21\/180000#breadcrumb"},"inLanguage":"ja","potentialAction":[{"@type":"ReadAction","target":["https:\/\/developers.microad.co.jp\/entry\/2025\/11\/21\/180000"]}]},{"@type":"ImageObject","inLanguage":"ja","@id":"https:\/\/developers.microad.co.jp\/entry\/2025\/11\/21\/180000#primaryimage","url":"https:\/\/pokecon.jp\/job\/wp-content\/uploads\/2025\/11\/https3A2F2Fcdn-ak.f.st-hatena.com2Fimages2Ffotolife2Fm2Fmicroad-developers2F202511172F20251.png","contentUrl":"https:\/\/pokecon.jp\/job\/wp-content\/uploads\/2025\/11\/https3A2F2Fcdn-ak.f.st-hatena.com2Fimages2Ffotolife2Fm2Fmicroad-developers2F202511172F20251.png","width":1300,"height":683},{"@type":"BreadcrumbList","@id":"https:\/\/developers.microad.co.jp\/entry\/2025\/11\/21\/180000#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"\u30db\u30fc\u30e0","item":"https:\/\/pokecon.jp\/job\/"},{"@type":"ListItem","position":2,"name":"CTR\u4e88\u6e2c\u3067\u3082 Target Encoding \u306f\u5927\u4e8b\u3060\u3068\u3044\u3046\u8a71 &#8211; MicroAd Developers Blog"}]},{"@type":"WebSite","@id":"https:\/\/pokecon.jp\/job\/#website","url":"https:\/\/pokecon.jp\/job\/","name":"\u30dd\u30b1\u30b3\u30f3","description":"","potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/pokecon.jp\/job\/?s={search_term_string}"},"query-input":{"@type":"PropertyValueSpecification","valueRequired":true,"valueName":"search_term_string"}}],"inLanguage":"ja"},{"@type":"Person","@id":"https:\/\/pokecon.jp\/job\/#\/schema\/person\/16c9f07b1ba984d165d9aee259bda997","name":"info@pokecon.jp","image":{"@type":"ImageObject","inLanguage":"ja","@id":"https:\/\/secure.gravatar.com\/avatar\/2b0549cd9f7907c092ca5fbb283baf72337f235726e4b46fa39ec0b701ac2fe2?s=96&d=wavatar&r=g","url":"https:\/\/secure.gravatar.com\/avatar\/2b0549cd9f7907c092ca5fbb283baf72337f235726e4b46fa39ec0b701ac2fe2?s=96&d=wavatar&r=g","contentUrl":"https:\/\/secure.gravatar.com\/avatar\/2b0549cd9f7907c092ca5fbb283baf72337f235726e4b46fa39ec0b701ac2fe2?s=96&d=wavatar&r=g","caption":"info@pokecon.jp"},"url":"https:\/\/pokecon.jp\/job\/author\/infopokecon-jp\/"}]}},"_links":{"self":[{"href":"https:\/\/pokecon.jp\/job\/wp-json\/wp\/v2\/posts\/24631","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/pokecon.jp\/job\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/pokecon.jp\/job\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/pokecon.jp\/job\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/pokecon.jp\/job\/wp-json\/wp\/v2\/comments?post=24631"}],"version-history":[{"count":1,"href":"https:\/\/pokecon.jp\/job\/wp-json\/wp\/v2\/posts\/24631\/revisions"}],"predecessor-version":[{"id":24633,"href":"https:\/\/pokecon.jp\/job\/wp-json\/wp\/v2\/posts\/24631\/revisions\/24633"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/pokecon.jp\/job\/wp-json\/wp\/v2\/media\/24632"}],"wp:attachment":[{"href":"https:\/\/pokecon.jp\/job\/wp-json\/wp\/v2\/media?parent=24631"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/pokecon.jp\/job\/wp-json\/wp\/v2\/categories?post=24631"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/pokecon.jp\/job\/wp-json\/wp\/v2\/tags?post=24631"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}