{"id":467,"date":"2018-09-11T20:06:38","date_gmt":"2018-09-11T11:06:38","guid":{"rendered":"https:\/\/best-biostatistics.com\/toukei-er\/entry\/how-to-do-random-forest-in-r\/"},"modified":"2024-10-12T23:02:57","modified_gmt":"2024-10-12T14:02:57","slug":"how-to-do-random-forest-in-r","status":"publish","type":"post","link":"https:\/\/best-biostatistics.com\/toukei-er\/entry\/how-to-do-random-forest-in-r\/","title":{"rendered":"R \u3067\u30e9\u30f3\u30c0\u30e0\u30d5\u30a9\u30ec\u30b9\u30c8\u3092\u884c\u3046\u65b9\u6cd5 \u91cd\u8981\u5ea6\u306e\u53ef\u8996\u5316\u306e\u65b9\u6cd5"},"content":{"rendered":"\n<p>R \u3067\u30e9\u30f3\u30c0\u30e0\u30d5\u30a9\u30ec\u30b9\u30c8\u3092\u5b9f\u884c\u3059\u308b\u65b9\u6cd5\u3002<\/p>\n\n\n\n<!--more-->\n\n\n\n<h2 class=\"wp-block-heading\" id=\"\u30e9\u30f3\u30c0\u30e0\u30d5\u30a9\u30ec\u30b9\u30c8\u3068\u30d0\u30ae\u30f3\u30b0\u306e\u9055\u3044\">\u30e9\u30f3\u30c0\u30e0\u30d5\u30a9\u30ec\u30b9\u30c8\u3068\u30d0\u30ae\u30f3\u30b0\u306e\u9055\u3044<\/h2>\n\n\n\n<p>\u30e9\u30f3\u30c0\u30e0\u30d5\u30a9\u30ec\u30b9\u30c8\u3068\u30d0\u30ae\u30f3\u30b0\u306e\u9055\u3044\u306f\u3001\u3053\u3061\u3089\u306e\u8a18\u4e8b\u3092\u53c2\u7167\u3002<\/p>\n\n\n<div class=\"swell-block-postLink\">\t\t\t<div class=\"p-blogCard -internal\" data-type=\"type1\" data-onclick=\"clickLink\">\n\t\t\t\t<div class=\"p-blogCard__inner\">\n\t\t\t\t\t<span class=\"p-blogCard__caption\">\u3042\u308f\u305b\u3066\u8aad\u307f\u305f\u3044<\/span>\n\t\t\t\t\t<div class=\"p-blogCard__thumb c-postThumb\"><figure class=\"c-postThumb__figure\"><img decoding=\"async\" src=\"https:\/\/best-biostatistics.com\/toukei-er\/wp-content\/uploads\/2024\/08\/1920x1080-video-Excel-300x169.jpg\" alt=\"\" class=\"c-postThumb__img u-obf-cover\" width=\"320\" height=\"180\"><\/figure><\/div>\t\t\t\t\t<div class=\"p-blogCard__body\">\n\t\t\t\t\t\t<a class=\"p-blogCard__title\" href=\"https:\/\/best-biostatistics.com\/toukei-er\/entry\/difference-between-bagging-and-random-forest\/\">\u30e9\u30f3\u30c0\u30e0\u30d5\u30a9\u30ec\u30b9\u30c8\u3068\u30d0\u30ae\u30f3\u30b0\u306e\u9055\u3044<\/a>\n\t\t\t\t\t\t<span class=\"p-blogCard__excerpt\">\u30e9\u30f3\u30c0\u30e0\u30d5\u30a9\u30ec\u30b9\u30c8\u3068\u30d0\u30ae\u30f3\u30b0\u306f\u3001\u6c7a\u5b9a\u6728\u3092\u3088\u308a\u6c4e\u7528\u5316\u3059\u308b\u305f\u3081\u306b\u8003\u3048\u3089\u308c\u305f\u624b\u6cd5\u3002 \u9055\u3044\u306f\u4f55\u304b\uff1f \u6982\u5ff5\u7684\u306a\u7c21\u5358\u306a\u8aac\u660e\u3002 \u30e9\u30f3\u30c0\u30e0\u30d5\u30a9\u30ec\u30b9\u30c8\u3068\u30d0\u30ae\u30f3\u30b0\u306e\u7dcf\u79f0 \u30a2\u30f3\u30b5\u30f3\u30d6&#8230;<\/span>\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t<\/div>\n\t\t<\/div>\n\n\n\n\n\n\n<h2 class=\"wp-block-heading\" id=\"R-\u3067\u30e9\u30f3\u30c0\u30e0\u30d5\u30a9\u30ec\u30b9\u30c8\u3092\u5b9f\u884c\u3059\u308b\u30d1\u30c3\u30b1\u30fc\u30b8\u306e\u6e96\u5099\">R \u3067\u30e9\u30f3\u30c0\u30e0\u30d5\u30a9\u30ec\u30b9\u30c8\u3092\u5b9f\u884c\u3059\u308b\u30d1\u30c3\u30b1\u30fc\u30b8\u306e\u6e96\u5099<\/h2>\n\n\n\n<p>\u30d1\u30c3\u30b1\u30fc\u30b8\u306frandomForest\u3068\u3044\u3046\u305d\u306e\u307e\u307e\u306e\u540d\u524d\u306e\u30d1\u30c3\u30b1\u30fc\u30b8\u3092\u4f7f\u3046\u3002<\/p>\n\n\n\n<p>\u6700\u521d\u306b\u4e00\u56de\u3060\u3051\u30a4\u30f3\u30b9\u30c8\u30fc\u30eb\u3059\u308b\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>install.packages(\"randomForest\")<\/code><\/pre>\n\n\n\n<p>\u4f7f\u3048\u308b\u3088\u3046\u306b\u547c\u3073\u51fa\u3057\u3066\u304a\u304f\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>library(randomForest)<\/code><\/pre>\n\n\n\n<div id=\"biost-1937561418\" class=\"biost- biost-entity-placement\"><p style=\"text-align: center;\"><span style=\"font-size: 20px;\"><strong><a href=\"https:\/\/best-biostatistics.com\/kmhl\">\uff1e\uff1e\u3082\u3046\u7d71\u8a08\u3067\u60a9\u3080\u306e\u306f\u7d42\u308f\u308a\u306b\u3057\u307e\u305b\u3093\u304b\uff1f\u00a0<\/a><\/strong><\/span><\/p>\r\n<a href=\"https:\/\/best-biostatistics.com\/kmhl\"><img class=\"aligncenter wp-image-2794 size-full\" src=\"https:\/\/best-biostatistics.com\/wp\/wp-content\/uploads\/2023\/11\/bn_r_03.png\" alt=\"\" width=\"500\" height=\"327\" \/><\/a>\r\n<p style=\"text-align: center;\"><span style=\"color: #ff0000; font-size: 20px;\"><strong><span class=\"marker2\">\u21911\u4e07\u4eba\u4ee5\u4e0a\u306e\u533b\u7642\u5f93\u4e8b\u8005\u304c\u8cfc\u8aad\u4e2d<\/span><\/strong><\/span><\/p><\/div><h2 class=\"wp-block-heading\" id=\"R-\u306e\u30e9\u30f3\u30c0\u30e0\u30d5\u30a9\u30ec\u30b9\u30c8\u3067\u6c7a\u5b9a\u6728\u3092\u4f5c\u308b\u4f8b\">R \u306e\u30e9\u30f3\u30c0\u30e0\u30d5\u30a9\u30ec\u30b9\u30c8\u3067\u6c7a\u5b9a\u6728\u3092\u4f5c\u308b\u4f8b<\/h2>\n\n\n\n<p>iris\u30c7\u30fc\u30bf\u3092\u4f7f\u3063\u3066\u3001\u30e9\u30f3\u30c0\u30e0\u30d5\u30a9\u30ec\u30b9\u30c8\u3067\u6c7a\u5b9a\u6728\u3092\u4f5c\u3063\u3066\u307f\u308b\u3002<\/p>\n\n\n\n<p>set.seed()\u3067\u30e9\u30f3\u30c0\u30e0\u5909\u6570\u306e\u30b7\u30fc\u30c9\u3092\u8a2d\u5b9a\u3057\u3066\u304a\u304d\u3001\u518d\u73fe\u6027\u3092\u6301\u305f\u305b\u308b\u3002<\/p>\n\n\n\n<p>Species\u3092\u305d\u308c\u4ee5\u5916\u306e\u5909\u6570\u3067\u4e88\u6e2c\u3059\u308b\u6c7a\u5b9a\u6728\u3092\u4f5c\u6210\u3059\u308b\u30b9\u30af\u30ea\u30d7\u30c8\u306f\u4ee5\u4e0b\u306e\u901a\u308a\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>set.seed(71)\niris.rf &lt;- randomForest(Species ~ ., data=iris)<\/code><\/pre>\n\n\n\n<p>\u7d50\u679c\u306f\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u8868\u793a\u3055\u308c\u308b\u3002\u30e9\u30f3\u30c0\u30e0\u30b5\u30f3\u30d7\u30ea\u30f3\u30b0\u3092\u4f7f\u3063\u3066\u3001\u6c7a\u5b9a\u6728\u306f500\u500b\u4f5c\u3063\u3066\u3044\u308b\u3002\u30a8\u30e9\u30fc\u7387\u306f5.33%<\/p>\n\n\n\n<p>Out Of Bag (OOB)\u3068\u306f\u30013\u5206\u306e1\u3092\u30c6\u30b9\u30c8\u7528\u306b\u5916\u3057\u3066\u304a\u3044\u3066\u5b66\u7fd2\u3057\u3066\u3001\u30c6\u30b9\u30c8\u30c7\u30fc\u30bf\u306e\u7d50\u679c\u3067Confusion matrix\u3092\u4f5c\u308a\u691c\u8a0e\u3057\u3066\u3044\u308b\u3053\u3068\u3092\u610f\u5473\u3057\u3066\u3044\u308b\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>&gt; iris.rf\nCall:\nrandomForest(formula = Species ~ ., data = iris)\nType of random forest: classification\nNumber of trees: 500\nNo. of variables tried at each split: 2\nOOB estimate of  error rate: 5.33%\nConfusion matrix:\nsetosa versicolor virginica class.error\nsetosa         50          0         0        0.00\nversicolor      0         47         3        0.06\nvirginica       0          5        45        0.10\n<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading lang:r decode:true crayon-selected\" id=\"R-\u3067\u30e9\u30f3\u30c0\u30e0\u30d5\u30a9\u30ec\u30b9\u30c8\u3092\u5b9f\u884c\u3057\u305f\u7d50\u679c-\u91cd\u8981\u306a\u5909\u6570\u3092\u8868\u793a\u3059\u308b\">R \u3067\u30e9\u30f3\u30c0\u30e0\u30d5\u30a9\u30ec\u30b9\u30c8\u3092\u5b9f\u884c\u3057\u305f\u7d50\u679c \u91cd\u8981\u306a\u5909\u6570\u3092\u8868\u793a\u3059\u308b<\/h2>\n\n\n\n<p>\u91cd\u8981\u306a\u5909\u6570\u306f\u3001\u30b8\u30cb\u4e0d\u7d14\u5ea6\u306e\u6e1b\u5c11\u91cf\u3067\u898b\u308b\u3002<\/p>\n\n\n\n<p>\u30b0\u30e9\u30d5\u3067\u306fMean Decrease Gini\u3068\u8868\u793a\u3055\u308c\u308b\u3002<\/p>\n\n\n\n<p>\u30b8\u30cb\u4e0d\u7d14\u5ea6\u304c\u5927\u304d\u304f\u4e0b\u304c\u308b\u5909\u6570\u304c\u3001\u8b58\u5225\u306b\u5f79\u7acb\u3064\u91cd\u8981\u306a\u5909\u6570\u3068\u3044\u3046\u610f\u5473\u3002<\/p>\n\n\n\n<p>\u4e0d\u7d14\u5ea6\u304c\u4e0b\u304c\u3063\u3066\u3001\u7d14\u5ea6\u304c\u5897\u3059\u3068\u3044\u3046\u3053\u3068\u306f\u3001\u3088\u308a\u7d14\u7c8b\u306a\u30b0\u30eb\u30fc\u30d7\u3001\u3064\u307e\u308a\u3088\u308a\u3088\u304f\u5206\u3051\u308b\u3053\u3068\u304c\u3067\u304d\u308b\u5909\u6570\u3068\u3044\u3046\u3053\u3068\u306b\u306a\u308b\u3002<\/p>\n\n\n\n<p>\u91cd\u8981\u306a\u5909\u6570\u30d7\u30ed\u30c3\u30c8\u3067\u306f\u3001Petal.Width\u3068Petal.Length\u304c\u91cd\u8981\u3067\u3042\u308b\u3053\u3068\u304c\u793a\u3055\u308c\u305f\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>varImpPlot(iris.rf)<\/code><\/pre>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"587\" height=\"586\" src=\"https:\/\/best-biostatistics.com\/toukei-er\/wp-content\/uploads\/2018\/09\/20180911200533.png\" alt=\"\" class=\"wp-image-2747\" title=\"f:id:toukeier:20180911200533p:plain\" srcset=\"https:\/\/best-biostatistics.com\/toukei-er\/wp-content\/uploads\/2018\/09\/20180911200533.png 587w, https:\/\/best-biostatistics.com\/toukei-er\/wp-content\/uploads\/2018\/09\/20180911200533-300x300.png 300w, https:\/\/best-biostatistics.com\/toukei-er\/wp-content\/uploads\/2018\/09\/20180911200533-150x150.png 150w\" sizes=\"(max-width: 587px) 100vw, 587px\" \/><\/figure>\n\n\n\n\n\n\n\n<h2 class=\"wp-block-heading\" id=\"\u307e\u3068\u3081\">\u307e\u3068\u3081<\/h2>\n\n\n\n<p>\u7d71\u8a08\u30bd\u30d5\u30c8R\u3067\u30e9\u30f3\u30c0\u30e0\u30d5\u30a9\u30ec\u30b9\u30c8\u3092\u5b9f\u884c\u3057\u305f\u3044\u5834\u5408\u3001randomForest\u30d1\u30c3\u30b1\u30fc\u30b8\u3092\u4f7f\u3046\u3002<\/p>\n\n\n\n<p>randomForest()\u3067\u89e3\u6790\u304c\u5b9f\u884c\u3067\u304d\u3066\u3001varImpPlot()\u3067\u91cd\u8981\u306a\u5909\u6570\u304c\u56f3\u793a\u3055\u308c\u308b\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>R \u3067\u30e9\u30f3\u30c0\u30e0\u30d5\u30a9\u30ec\u30b9\u30c8\u3092\u5b9f\u884c\u3059\u308b\u65b9\u6cd5\u3002<\/p>\n","protected":false},"author":2,"featured_media":2747,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"swell_btn_cv_data":"","_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":false,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2}},"categories":[5,103],"tags":[],"class_list":["post-467","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-r","category-103"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"https:\/\/best-biostatistics.com\/toukei-er\/wp-content\/uploads\/2018\/09\/20180911200533.png","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/best-biostatistics.com\/toukei-er\/wp-json\/wp\/v2\/posts\/467","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/best-biostatistics.com\/toukei-er\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/best-biostatistics.com\/toukei-er\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/best-biostatistics.com\/toukei-er\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/best-biostatistics.com\/toukei-er\/wp-json\/wp\/v2\/comments?post=467"}],"version-history":[{"count":3,"href":"https:\/\/best-biostatistics.com\/toukei-er\/wp-json\/wp\/v2\/posts\/467\/revisions"}],"predecessor-version":[{"id":2749,"href":"https:\/\/best-biostatistics.com\/toukei-er\/wp-json\/wp\/v2\/posts\/467\/revisions\/2749"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/best-biostatistics.com\/toukei-er\/wp-json\/wp\/v2\/media\/2747"}],"wp:attachment":[{"href":"https:\/\/best-biostatistics.com\/toukei-er\/wp-json\/wp\/v2\/media?parent=467"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/best-biostatistics.com\/toukei-er\/wp-json\/wp\/v2\/categories?post=467"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/best-biostatistics.com\/toukei-er\/wp-json\/wp\/v2\/tags?post=467"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}