{"id":7405,"date":"2025-11-13T16:09:23","date_gmt":"2025-11-13T07:09:23","guid":{"rendered":"https:\/\/blog.since2020.jp\/?p=7405"},"modified":"2025-11-13T16:15:02","modified_gmt":"2025-11-13T07:15:02","slug":"f1-precision-recall","status":"publish","type":"post","link":"https:\/\/since2020.jp\/media\/f1-precision-recall\/","title":{"rendered":"\u3010\u9069\u5408\u7387\u3068\u518d\u73fe\u7387\u306f\u3082\u3046\u8ff7\u308f\u306a\u3044\uff01\u3011\u8a55\u4fa1\u6307\u6a19\u3092\u89e3\u8aac"},"content":{"rendered":"\n<p>\u3053\u306e\u8a18\u4e8b\u3067\u306f\u3001\u4e8c\u5024\u5206\u985e\u3092\u4e2d\u5fc3\u306b\u7cbe\u5ea6\u8a55\u4fa1\u306e\u5168\u4f53\u50cf\u3092\u6574\u7406\u3057\u3064\u3064\u3001\u7279\u306b\u300c\u9069\u5408\u7387\uff08Precision\uff09\u300d\u3068\u300c\u518d\u73fe\u7387\uff08Recall\uff09\u300d\u306e\u9055\u3044\u3092\u5fd8\u308c\u306a\u3044\u899a\u3048\u65b9\u3092\u30de\u30b9\u30bf\u30fc\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n<h2>\u30a4\u30f3\u30c8\u30ed\u30c0\u30af\u30b7\u30e7\u30f3<\/h2>\n<p>\u6a5f\u68b0\u5b66\u7fd2\u30e2\u30c7\u30eb\u306e\u6027\u80fd\u8a55\u4fa1\u3067\u5fc5\u305a\u767b\u5834\u3059\u308bF1\u30b9\u30b3\u30a2\u306a\u3069\u306e<strong>\u8a55\u4fa1\u6307\u6a19<\/strong>\u3002\u300c\u9069\u5408\u7387\u3068\u518d\u73fe\u7387\u306e\u9055\u3044\u304c\u3044\u3064\u3082\u6df7\u4e71\u3059\u308b&#8230;\u300d\u305d\u3093\u306a\u60a9\u307f\u3092\u89e3\u6c7a\u3057\u307e\u3059\u3002<\/p>\r\n<p>\u3053\u306e\u8a18\u4e8b\u3067\u306f\u3001\u4e8c\u5024\u5206\u985e\u3092\u4e2d\u5fc3\u306b\u7cbe\u5ea6\u8a55\u4fa1\u306e\u5168\u4f53\u50cf\u3092\u6574\u7406\u3057\u3064\u3064\u3001\u7279\u306b\u300c\u9069\u5408\u7387\uff08Precision\uff09\u300d\u3068\u300c\u518d\u73fe\u7387\uff08Recall\uff09\u300d\u306e\u9055\u3044\u3092\u5fd8\u308c\u306a\u3044\u899a\u3048\u65b9\u3092\u30de\u30b9\u30bf\u30fc\u3067\u304d\u307e\u3059\u3002<\/p>\r\n<p><!-- notionvc: 6f795851-c9da-4b29-9a12-a5a3f995e62d --><\/p>\n\n<h2>\u91cd\u8981\u306a\u57fa\u790e\uff1a\u6df7\u540c\u884c\u5217\u3092\u4f5c\u308c\u30709\u5272\u308f\u304b\u308b\uff01<\/h2>\n<p>\u4e8c\u5024\u5206\u985e\u3067\u306f\u3001\u4e88\u6e2c\u3068\u5b9f\u969b\u306e\u7d44\u307f\u5408\u308f\u305b\u3092 <span style=\"color: #ff0000\"><strong>\u6df7\u540c\u884c\u5217\uff08Confusion Matrix\uff09<\/strong><\/span> \u306b\u4e26\u3079\u307e\u3059\u3002<\/p>\r\n<p><img decoding=\"async\" src=\"https:\/\/since2020.jp\/media\/wp-content\/uploads\/2025\/11\/\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8-2025-11-13-16.01.36.png\" alt=\"\" width=\"752\" height=\"248\" class=\"alignnone size-full wp-image-7407\" srcset=\"https:\/\/since2020.jp\/media\/wp-content\/uploads\/2025\/11\/\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8-2025-11-13-16.01.36.png 752w, https:\/\/since2020.jp\/media\/wp-content\/uploads\/2025\/11\/\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8-2025-11-13-16.01.36-300x99.png 300w\" sizes=\"(max-width: 752px) 100vw, 752px\" \/><\/p>\r\n<ul>\r\n\t<li><strong>TP<\/strong>\uff08True Positive\uff09: \u6b63\u3057\u304f\u967d\u6027\u3068\u5f53\u3066\u305f<\/li>\r\n\t<li><strong>FP<\/strong>\uff08False Positive\uff09: \u672c\u5f53\u306f\u9670\u6027\u306a\u306e\u306b\u967d\u6027\u3068\u8aa4\u5224\u5b9a\uff08<strong>\u8aa4\u691c\u51fa\u30fb\u8aa4\u5831<\/strong>\uff09<\/li>\r\n\t<li><strong>FN<\/strong>\uff08False Negative\uff09: \u672c\u5f53\u306f\u967d\u6027\u306a\u306e\u306b\u9670\u6027\u3068\u8aa4\u5224\u5b9a<strong>\uff08\u898b\u9003\u3057\uff09<\/strong><\/li>\r\n\t<li><strong>TN<\/strong>\uff08True Negative\uff09: \u6b63\u3057\u304f\u9670\u6027\u3068\u5f53\u3066\u305f<\/li>\r\n<\/ul>\r\n<blockquote>\r\n<p>\u3053\u308c\u304b\u3089\u7d39\u4ecb\u3059\u308b\u8a55\u4fa1\u6307\u6a19\u306f\u3001\u3059\u3079\u3066\u6df7\u540c\u884c\u5217\u304b\u3089\u5c0e\u304b\u308c\u307e\u3059\uff01<\/p>\r\n<\/blockquote>\r\n<p><!-- notionvc: 269ad96e-38d1-452a-baa0-a97631031143 --><\/p>\n\n<h2>\u4e3b\u8981\u306a\u8a55\u4fa1\u6307\u6a19<\/h2>\n<b>\u6b63\u89e3\u7387\uff08Accuracy\uff09<\/b>\r\n<p><strong>Accuracy = (TP + TN) \/ (TP + FP + FN + TN)<\/strong><\/p>\r\n<ul>\r\n\t<li>\u300c\u5168\u4f53\u306e\u3046\u3061\u3001\u6b63\u3057\u304f\u4e88\u6e2c\u3067\u304d\u305f\u5272\u5408\u300d<\/li>\r\n\t<li>\u30b7\u30f3\u30d7\u30eb\u3067\u3059\u304c\u3001<strong>\u4e0d\u5747\u8861\u30c7\u30fc\u30bf\uff08\u967d\u6027\u304c\u5e0c\u5c11\u306a\u3069\uff09<\/strong>\u3067\u306f\u6ce8\u610f\u304c\u5fc5\u8981\r\n\r\n<ul>\r\n\t<li>\u4f8b\uff1a100\u4eba\u4e2d1\u4eba\u3060\u3051\u304c\u75c5\u6c17\u306e\u5834\u5408\u3001\u5168\u54e1\u3092\u300c\u5065\u5eb7\u300d\u3068\u4e88\u6e2c\u3057\u3066\u3082\u6b63\u89e3\u738799%\u306b\u306a\u3063\u3066\u3057\u307e\u3044\u307e\u3059\u3002\u3057\u304b\u3057\u75c5\u6c17\u306e\u4eba\u3092\u4e00\u4eba\u3082\u767a\u898b\u3067\u304d\u3066\u3044\u306a\u3044\u305f\u3081\u3001\u5b9f\u7528\u4e0a\u306f\u4fa1\u5024\u304c\u3042\u308a\u307e\u305b\u3093\u3002\u3053\u308c\u3092\u201d<strong>Accuracy\u30d1\u30e9\u30c9\u30c3\u30af\u30b9\u201d<\/strong>\uff08\u898b\u305b\u304b\u3051\u306e\u9ad8\u7cbe\u5ea6\uff09\u3068\u547c\u3073\u307e\u3059\u3002<\/li>\r\n<\/ul>\r\n<\/li>\r\n<\/ul>\r\n<b>\u9069\u5408\u7387\uff08Precision\uff09\uff1d\u300c\u967d\u6027\u3068<strong>\u8a00\u3063\u305f\u3082\u306e<\/strong>\u306e\u7d14\u5ea6\u300d<\/b>\r\n<p><strong>Precision = TP \/ (TP + FP)<\/strong>\uff08\u5206\u6bcd\uff1a<strong>\u4e88\u6e2c\u304c\u967d\u6027<\/strong>\uff09<\/p>\r\n<ul>\r\n\t<li><strong>\u300c\u30e2\u30c7\u30eb\u304c\u967d\u6027\u3068\u4e88\u6e2c\u3057\u305f\u3082\u306e\u306e\u3046\u3061\u3001\u5b9f\u969b\u306b\u967d\u6027\u3060\u3063\u305f\u5272\u5408\u300d<\/strong><\/li>\r\n\t<li>\u9069\u5408\u7387\u304c\u9ad8\u3044 = \u4e88\u6e2c\u306e\u300c\u7684\u4e2d\u7387\u300d\u304c\u9ad8\u3044 = \u8aa4\u5831\u304c\u5c11\u306a\u3044<\/li>\r\n\t<li>\u4f8b\uff1a\u8ff7\u60d1\u30e1\u30fc\u30eb\u5224\u5b9a \u2192 \u8ff7\u60d1\u6271\u3044\u3057\u305f\u30e1\u30fc\u30eb\u306e<strong>\u5916\u3057\u304c\u5c11\u306a\u3044\u304b<\/strong>\uff08\u8aa4\u7206\u3057\u305f\u304f\u306a\u3044\uff09<\/li>\r\n<\/ul>\r\n<b>\u518d\u73fe\u7387\uff08Recall \uff09\uff1d\u300c\u672c\u5f53\u306e\u967d\u6027\u3092<strong>\u3069\u308c\u3060\u3051\u62fe\u3048\u305f<\/strong>\u304b\u300d<\/b>\r\n<p><strong>Recall = TP \/ (TP + FN)<\/strong>\uff08\u5206\u6bcd\uff1a<strong>\u5b9f\u969b\u304c\u967d\u6027<\/strong>\uff09<\/p>\r\n<ul>\r\n\t<li><strong>\u300c\u5b9f\u969b\u306b\u967d\u6027\u306e\u3082\u306e\u306e\u3046\u3061\u3001\u30e2\u30c7\u30eb\u304c\u6b63\u3057\u304f\u898b\u3064\u3051\u305f\u5272\u5408\u300d<\/strong><\/li>\r\n\t<li>\u518d\u73fe\u7387\u304c\u9ad8\u3044 = \u300c\u7db2\u7f85\u7387\u300d\u304c\u9ad8\u3044 = \u898b\u9003\u3057\u304c\u5c11\u306a\u3044<\/li>\r\n\t<li>\u4f8b\uff1a\u75be\u75c5\u30b9\u30af\u30ea\u30fc\u30cb\u30f3\u30b0 \u2192 \u75c5\u6c17\u306e\u4eba\u3092<strong>\u53d6\u308a\u3053\u307c\u3055\u306a\u3044\u304b<\/strong>\uff08\u898b\u9003\u3057\u305f\u304f\u306a\u3044\uff09<\/li>\r\n<\/ul>\r\n<blockquote>\r\n<p>2\u3064\u306e\u6307\u6a19\u306f \u6df7\u5408\u884c\u5217\u306e\u3069\u3053\u3092\u5206\u6bcd\u306b\u3059\u308b\u304b \u306e\u9055\u3044\u3067\u3059\u3002<\/p>\r\n<\/blockquote>\r\n<b>F1\u30b9\u30b3\u30a2<\/b>\r\n<p><strong>F1 = 2 \u00d7 (Precision \u00d7 Recall) \/ (Precision + Recall)<\/strong><\/p>\r\n<ul>\r\n\t<li>\u300c\u9069\u5408\u7387\u3068\u518d\u73fe\u7387\u306e\u8abf\u548c\u5e73\u5747\u300d\u3067\u3001<strong>\u30d0\u30e9\u30f3\u30b9<\/strong>\u3092\u91cd\u8996<\/li>\r\n\t<li><strong>\u306a\u305c\u8abf\u548c\u5e73\u5747\uff1f<\/strong>\r\n<ul>\r\n\t<li>\u5358\u7d14\u5e73\u5747\u3067\u306f\u7247\u65b9\u304c\u6975\u7aef\u306b\u4f4e\u304f\u3066\u3082\u9ad8\u5f97\u70b9\u306b\u306a\u3063\u3066\u3057\u307e\u3046\u304b\u3089\u3002<\/li>\r\n\t<li>\u4f8b\uff1aPrecision=100%\u3001Recall=10% \u2192 \u5358\u7d14\u5e73\u574755%\u3001F1\u30b9\u30b3\u30a218%<\/li>\r\n\t<li>\u8abf\u548c\u5e73\u5747\u306f<strong>\u6975\u7aef\u306b\u5c0f\u3055\u3044\u5024\u306b\u5f15\u304d\u305a\u3089\u308c\u308b<\/strong>\u7279\u5fb4\u304c\u3042\u308b\u305f\u3081\u3001\u4e21\u65b9\u304c\u9ad8\u304f\u306a\u3044\u3068\u9ad8\u5f97\u70b9\u306b\u306a\u3089\u306a\u3044\uff01<\/li>\r\n<\/ul>\r\n<\/li>\r\n<\/ul>\r\n<b>\u7279\u7570\u5ea6<\/b>\r\n<p><strong>Specificity = TN \/ (TN + FP)<\/strong><\/p>\r\n<ul>\r\n\t<li>\u9670\u6027\u3092\u6b63\u3057\u304f\u9670\u6027\u3068\u5224\u5b9a\u3067\u304d\u305f\u5272\u5408\uff08= 1 &#8211; \u507d\u967d\u6027\u7387\uff09<\/li>\r\n\t<li>\u300c\u9670\u6027\u306e\u518d\u73fe\u7387\u300d\u3068\u3082\u8a00\u3048\u3001\u533b\u7642\u691c\u67fb\u306a\u3069\u3067\u3001\u518d\u73fe\u7387\uff08\u611f\u5ea6\uff09\u3068\u30da\u30a2\u3067\u5831\u544a\u3055\u308c\u308b\u3053\u3068\u304c\u591a\u3044\u3067\u3059\u3002<\/li>\r\n<\/ul>\r\n<p><!-- notionvc: 5b4d8821-1383-4cc4-8635-91afaae536e0 --><\/p>\n\n<h2>\u9069\u5408\u7387\u3001\u518d\u73fe\u7387\u3092\u4e00\u751f\u5fd8\u308c\u306a\u3044\u899a\u3048\u65b9<\/h2>\n<b>\u6697\u8a18\u30d5\u30c3\u30af<\/b>\r\n<p><strong>\u300c<span style=\"color: #ff0000\">P\u306fPrediction\u3001R\u306fReality<\/span>\u300d<\/strong><\/p>\r\n<ul>\r\n\t<li><strong>P<\/strong>recision \u306f <strong>P<\/strong>rediction\uff08\u4e88\u6e2c\uff09\u306e P \u2192 <strong>\u5206\u6bcd\u306f\u300c\u4e88\u6e2c\u967d\u6027\u300d<\/strong><\/li>\r\n\t<li><strong>R<\/strong>ecall \u306f <strong>R<\/strong>eality\uff08\u73fe\u5b9f\uff09\u306e R \u2192 <strong>\u5206\u6bcd\u306f\u300c\u5b9f\u969b\u306e\u967d\u6027\u300d<\/strong><\/li>\r\n<\/ul>\r\n<b>\u9069\u5408\u7387\u3068\u518d\u73fe\u7387\u306e\u9055\u3044\u5bfe\u6bd4\u8868<\/b>\r\n<p><img decoding=\"async\" src=\"https:\/\/since2020.jp\/media\/wp-content\/uploads\/2025\/11\/\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8-2025-11-13-16.03.04.png\" alt=\"\" width=\"1392\" height=\"406\" class=\"alignnone size-full wp-image-7409\" srcset=\"https:\/\/since2020.jp\/media\/wp-content\/uploads\/2025\/11\/\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8-2025-11-13-16.03.04.png 1392w, https:\/\/since2020.jp\/media\/wp-content\/uploads\/2025\/11\/\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8-2025-11-13-16.03.04-300x88.png 300w, https:\/\/since2020.jp\/media\/wp-content\/uploads\/2025\/11\/\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8-2025-11-13-16.03.04-1024x299.png 1024w, https:\/\/since2020.jp\/media\/wp-content\/uploads\/2025\/11\/\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8-2025-11-13-16.03.04-768x224.png 768w\" sizes=\"(max-width: 1392px) 100vw, 1392px\" \/><\/p>\r\n<b>Precision\u3068Recall\u306e\u30c8\u30ec\u30fc\u30c9\u30aa\u30d5<\/b>\r\n<p>\u9069\u5408\u7387\u3068\u518d\u73fe\u7387\u306f<strong>\u4e00\u822c\u306b<span style=\"color: #ff0000\">\u30c8\u30ec\u30fc\u30c9\u30aa\u30d5<\/span>\u306e\u95a2\u4fc2<\/strong>\u306b\u3042\u308a\u307e\u3059\u3002\u30e2\u30c7\u30eb\u306e<strong>\u5224\u5b9a\u57fa\u6e96\uff08\u3057\u304d\u3044\u5024\uff09<\/strong>\u3092\u8abf\u6574\u3059\u308b\u3053\u3068\u3067\u3001\u3069\u3061\u3089\u3092\u91cd\u8996\u3059\u308b\u304b\u3092\u5909\u3048\u3089\u308c\u307e\u3059\u304c\u3001\u4e00\u65b9\u3092\u4e0a\u3052\u308b\u3068\u4ed6\u65b9\u304c\u4e0b\u304c\u308b\u50be\u5411\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\r\n<p><!-- notionvc: 1cb6c729-10e4-42c8-b7c6-55755160d74c --><\/p>\n\n<h2>\u304a\u308f\u308a\u306b<\/h2>\n<b>\u307e\u3068\u3081<\/b>\r\n<p>\u2705 <strong>P\u306fPrediction \u2192 Precision\u306f\u5206\u6bcd\u304c\u4e88\u6e2c\u967d\u6027\u3002\u7d14\u5ea6\u3002<\/strong><\/p>\r\n<p>\u2705 <strong>R\u306fReality \u2192 Recall\u306f\u5206\u6bcd\u304c\u5b9f\u969b\u306e\u967d\u6027\u3002\u53d6\u308a\u3053\u307c\u3057\u3002<\/strong><\/p>\r\n<p>\u2705 <strong>F1\u306fP\u3068R\u306e\u8abf\u548c\u5e73\u5747<\/strong>\uff1a\u3069\u3061\u3089\u304b\u304c\u4f4e\u3044\u3068\u4e0b\u304c\u308b\u3002<\/p>\r\n<p>\u2705 <strong>\u30c8\u30ec\u30fc\u30c9\u30aa\u30d5\u3092\u7406\u89e3\u3059\u308b<\/strong>\uff1a\u95be\u5024\u8abf\u6574\u3067\u4e00\u65b9\u304c\u4e0a\u304c\u308b\u3068\u4ed6\u65b9\u304c\u4e0b\u304c\u308b<\/p>\r\n<blockquote>\r\n<p>\u305d\u306e\u4ed6\u306b\u3082\u3001ROC-AUC\u3084RMSE\u3001\u5bc4\u4e0e\u7387\u306a\u3069\u306e\u8a55\u4fa1\u6307\u6a19\u306b\u3064\u3044\u3066\u306f\u3001\u307e\u305f\u5225\u306e\u30d6\u30ed\u30b0\u3067\u3054\u7d39\u4ecb\u3057\u307e\u3059\uff01<\/p>\r\n<\/blockquote>\r\n<p><!-- notionvc: 398dc2a0-e3a2-4d01-8e3c-c212bd9a6b2e --><\/p>","protected":false},"excerpt":{"rendered":"<p>\u3053\u306e\u8a18\u4e8b\u3067\u306f\u3001\u4e8c\u5024\u5206\u985e\u3092\u4e2d\u5fc3\u306b\u7cbe\u5ea6\u8a55\u4fa1\u306e\u5168\u4f53\u50cf\u3092\u6574\u7406\u3057\u3064\u3064\u3001\u7279\u306b\u300c\u9069\u5408\u7387\uff08Precision\uff09\u300d\u3068\u300c\u518d\u73fe\u7387\uff08Recall\uff09\u300d\u306e\u9055\u3044\u3092\u5fd8\u308c\u306a\u3044\u899a\u3048\u65b9\u3092\u30de\u30b9\u30bf\u30fc\u3067\u304d\u307e\u3059\u3002 \u30a4\u30f3\u30c8\u30ed\u30c0\u30af\u30b7\u30e7\u30f3 \u6a5f\u68b0\u5b66\u7fd2\u30e2\u30c7\u30eb\u306e\u6027\u80fd\u8a55\u4fa1\u3067\u5fc5\u305a\u767b 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