{"id":1168,"date":"2023-07-27T10:31:36","date_gmt":"2023-07-27T10:31:36","guid":{"rendered":"https:\/\/statorials.org\/cn\/r%e4%b8%ad%e7%9a%84%e4%ba%8c%e6%ac%a1%e5%88%a4%e5%88%ab%e5%88%86%e6%9e%90\/"},"modified":"2023-07-27T10:31:36","modified_gmt":"2023-07-27T10:31:36","slug":"r%e4%b8%ad%e7%9a%84%e4%ba%8c%e6%ac%a1%e5%88%a4%e5%88%ab%e5%88%86%e6%9e%90","status":"publish","type":"post","link":"https:\/\/statorials.org\/cn\/r%e4%b8%ad%e7%9a%84%e4%ba%8c%e6%ac%a1%e5%88%a4%e5%88%ab%e5%88%86%e6%9e%90\/","title":{"rendered":"R \u4e2d\u7684\u4e8c\u6b21\u5224\u522b\u5206\u6790\uff08\u4e00\u6b65\u4e00\u6b65\uff09"},"content":{"rendered":"<p><\/p>\n<hr>\n<p><span style=\"color: #000000;\">\u5f53\u60a8\u6709\u4e00\u7ec4\u9884\u6d4b\u53d8\u91cf\u5e76\u4e14\u60f3\u8981\u5c06<a href=\"https:\/\/statorials.org\/cn\/\u53d8\u91cf\u89e3\u91ca\u6027\u53cd\u5e94\/\" target=\"_blank\" rel=\"noopener noreferrer\">\u54cd\u5e94\u53d8\u91cf<\/a>\u5206\u7c7b\u4e3a\u4e24\u4e2a\u6216\u591a\u4e2a\u7c7b\u65f6\uff0c\u53ef\u4ee5\u4f7f\u7528 <a href=\"https:\/\/statorials.org\/cn\/\u4e8c\u6b21\u5224\u522b\u5206\u6790\/\" target=\"_blank\" rel=\"noopener noreferrer\">\u4e8c\u6b21\u5224\u522b\u5206\u6790<\/a>\u65b9\u6cd5\u3002\u5b83\u88ab\u8ba4\u4e3a\u662f<a href=\"https:\/\/statorials.org\/cn\/r\u4e2d\u7684\u7ebf\u6027\u5224\u522b\u5206\u6790\/\" target=\"_blank\" rel=\"noopener noreferrer\">\u7ebf\u6027\u5224\u522b\u5206\u6790<\/a>\u7684\u975e\u7ebf\u6027\u7b49\u4ef7\u7269\u3002<\/span><\/p>\n<p><span style=\"color: #000000;\">\u672c\u6559\u7a0b\u63d0\u4f9b\u4e86\u5982\u4f55\u5728 R \u4e2d\u6267\u884c\u4e8c\u6b21\u5224\u522b\u5206\u6790\u7684\u5206\u6b65\u793a\u4f8b\u3002<\/span><\/p>\n<h3><span style=\"color: #000000;\"><strong>\u7b2c 1 \u6b65\uff1a\u52a0\u8f7d\u5fc5\u8981\u7684\u5e93<\/strong><\/span><\/h3>\n<p><span style=\"color: #000000;\">\u9996\u5148\uff0c\u6211\u4eec\u5c06\u52a0\u8f7d\u6b64\u793a\u4f8b\u6240\u9700\u7684\u5e93\uff1a<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <span style=\"color: #000000;\"><b><span style=\"color: #993300;\">library<\/span> (MASS)\n<span style=\"color: #993300;\">library<\/span> (ggplot2)<\/b><\/span><\/pre>\n<h3><span style=\"color: #000000;\"><strong>\u7b2c2\u6b65\uff1a\u52a0\u8f7d\u6570\u636e<\/strong><\/span><\/h3>\n<p><span style=\"color: #000000;\">\u5728\u672c\u4f8b\u4e2d\uff0c\u6211\u4eec\u5c06\u4f7f\u7528 R \u4e2d\u5185\u7f6e\u7684<strong>iris<\/strong>\u6570\u636e\u96c6\u3002\u4ee5\u4e0b\u4ee3\u7801\u6f14\u793a\u4e86\u5982\u4f55\u52a0\u8f7d\u548c\u663e\u793a\u8be5\u6570\u636e\u96c6\uff1a<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #008080;\">#attach <em>iris<\/em> dataset to make it easy to work with<\/span>\nattach(iris)\n\n<span style=\"color: #008080;\">#view structure of dataset\n<\/span>str(iris)\n\n'data.frame': 150 obs. of 5 variables:\n $ Sepal.Length: num 5.1 4.9 4.7 4.6 5 5.4 4.6 5 4.4 4.9 ...\n $ Sepal.Width: num 3.5 3 3.2 3.1 3.6 3.9 3.4 3.4 2.9 3.1 ...\n $Petal.Length: num 1.4 1.4 1.3 1.5 1.4 1.7 1.4 1.5 1.4 1.5 ...\n $Petal.Width: num 0.2 0.2 0.2 0.2 0.2 0.4 0.3 0.2 0.2 0.1 ...\n $ Species: Factor w\/ 3 levels \"setosa\",\"versicolor\",..: 1 1 1 1 1 1 1 ...\n<\/strong><\/pre>\n<p><span style=\"color: #000000;\">\u6211\u4eec\u53ef\u4ee5\u770b\u5230\u6570\u636e\u96c6\u603b\u5171\u5305\u542b 5 \u4e2a\u53d8\u91cf\u548c 150 \u4e2a\u89c2\u6d4b\u503c\u3002<\/span><\/p>\n<p><span style=\"color: #000000;\">\u5bf9\u4e8e\u8fd9\u4e2a\u4f8b\u5b50\uff0c\u6211\u4eec\u5c06\u6784\u5efa\u4e00\u4e2a\u4e8c\u6b21\u5224\u522b\u5206\u6790\u6a21\u578b\u6765\u5bf9\u7ed9\u5b9a\u82b1\u6735\u6240\u5c5e\u7684\u7269\u79cd\u8fdb\u884c\u5206\u7c7b\u3002<\/span><\/p>\n<p><span style=\"color: #000000;\">\u6211\u4eec\u5c06\u5728\u6a21\u578b\u4e2d\u4f7f\u7528\u4ee5\u4e0b\u9884\u6d4b\u53d8\u91cf\uff1a<\/span><\/p>\n<ul>\n<li><span style=\"color: #000000;\">\u843c\u7247\u957f\u5ea6<\/span><\/li>\n<li><span style=\"color: #000000;\">\u843c\u7247\u5bbd\u5ea6<\/span><\/li>\n<li><span style=\"color: #000000;\">\u82b1\u74e3\u957f\u5ea6<\/span><\/li>\n<li><span style=\"color: #000000;\">\u82b1\u74e3\u5bbd\u5ea6<\/span><\/li>\n<\/ul>\n<p><span style=\"color: #000000;\">\u6211\u4eec\u5c06\u4f7f\u7528\u5b83\u4eec\u6765\u9884\u6d4b<em>\u7269\u79cd<\/em>\u54cd\u5e94\u53d8\u91cf\uff0c\u8be5\u53d8\u91cf\u652f\u6301\u4ee5\u4e0b\u4e09\u4e2a\u6f5c\u5728\u7c7b\u522b\uff1a<\/span><\/p>\n<ul>\n<li><span style=\"color: #000000;\">\u5c71\u6bdb\u6989<\/span><\/li>\n<li><span style=\"color: #000000;\">\u6742\u8272<\/span><\/li>\n<li><span style=\"color: #000000;\">\u5f17\u5409\u5c3c\u4e9a\u5dde<\/span><\/li>\n<\/ul>\n<h3><span style=\"color: #000000;\"><strong>\u7b2c 3 \u6b65\uff1a\u521b\u5efa\u8bad\u7ec3\u548c\u6d4b\u8bd5\u6837\u672c<\/strong><\/span><\/h3>\n<p><span style=\"color: #000000;\">\u63a5\u4e0b\u6765\uff0c\u6211\u4eec\u5c06\u6570\u636e\u96c6\u5206\u4e3a\u7528\u4e8e\u8bad\u7ec3\u6a21\u578b\u7684\u8bad\u7ec3\u96c6\u548c\u7528\u4e8e\u6d4b\u8bd5\u6a21\u578b\u7684\u6d4b\u8bd5\u96c6\uff1a<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #008080;\">#make this example reproducible\n<\/span>set.seed(1)\n\n<span style=\"color: #008080;\">#Use 70% of dataset as training set and remaining 30% as testing set\n<\/span>sample &lt;- sample(c( <span style=\"color: #008000;\">TRUE<\/span> , <span style=\"color: #008000;\">FALSE<\/span> ), <span style=\"color: #3366ff;\">nrow<\/span> (iris), <span style=\"color: #3366ff;\">replace<\/span> = <span style=\"color: #008000;\">TRUE<\/span> , <span style=\"color: #3366ff;\">prob<\/span> =c(0.7,0.3))\ntrain &lt;- iris[sample, ]\ntest &lt;- iris[!sample, ] \n<\/strong><\/pre>\n<h3><span style=\"color: #000000;\"><strong>\u6b65\u9aa44\uff1a\u8c03\u6574QDA\u6a21\u578b<\/strong><\/span><\/h3>\n<p><span style=\"color: #000000;\">\u63a5\u4e0b\u6765\uff0c\u6211\u4eec\u5c06\u4f7f\u7528<strong>MASS<\/strong>\u5305\u4e2d\u7684<a href=\"https:\/\/www.rdocumentation.org\/packages\/MASS\/versions\/7.3-53\/topics\/qda\" target=\"_blank\" rel=\"noopener noreferrer\">qda() \u51fd\u6570<\/a>\u6765\u4f7f QDA \u6a21\u578b\u9002\u5e94\u6211\u4eec\u7684\u6570\u636e\uff1a<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #008080;\">#fit QDA model\n<\/span>model &lt;- qda(Species~., data=train)\n\n<span style=\"color: #008080;\">#view model output<\/span>\nmodel\n\nCall:\nqda(Species ~ ., data = train)\n\nPrior probabilities of groups:\n    setosa versicolor virginica \n 0.3207547 0.3207547 0.3584906 \n\nGroup means:\n           Sepal.Length Sepal.Width Petal.Length Petal.Width\nsetosa 4.982353 3.411765 1.482353 0.2411765\nversicolor 5.994118 2.794118 4.358824 1.3676471\nvirginica 6.636842 2.973684 5.592105 2.0552632 \n<\/strong><\/pre>\n<p><span style=\"color: #000000;\">\u4ee5\u4e0b\u662f\u89e3\u91ca\u6a21\u578b\u7ed3\u679c\u7684\u65b9\u6cd5\uff1a<\/span><\/p>\n<p><span style=\"color: #000000;\"><strong>\u7ec4\u5148\u9a8c\u6982\u7387\uff1a<\/strong>\u8fd9\u4e9b\u4ee3\u8868\u8bad\u7ec3\u96c6\u4e2d\u6bcf\u4e2a\u7269\u79cd\u7684\u6bd4\u4f8b\u3002\u4f8b\u5982\uff0c\u8bad\u7ec3\u96c6\u4e2d\u6240\u6709\u89c2\u6d4b\u503c\u7684 35.8% \u662f\u9488\u5bf9<em>virginica<\/em>\u7269\u79cd\u7684\u3002<\/span><\/p>\n<p><span style=\"color: #000000;\"><strong>\u7ec4\u5e73\u5747\u503c\uff1a<\/strong>\u663e\u793a\u6bcf\u4e2a\u7269\u79cd\u7684\u6bcf\u4e2a\u9884\u6d4b\u53d8\u91cf\u7684\u5e73\u5747\u503c\u3002<\/span><\/p>\n<h3><span style=\"color: #000000;\"><strong>\u7b2c 5 \u6b65\uff1a\u4f7f\u7528\u6a21\u578b\u8fdb\u884c\u9884\u6d4b<\/strong><\/span><\/h3>\n<p><span style=\"color: #000000;\">\u4e00\u65e6\u6211\u4eec\u4f7f\u7528\u8bad\u7ec3\u6570\u636e\u62df\u5408\u4e86\u6a21\u578b\uff0c\u6211\u4eec\u5c31\u53ef\u4ee5\u7528\u5b83\u6765\u5bf9\u6d4b\u8bd5\u6570\u636e\u8fdb\u884c\u9884\u6d4b\uff1a<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #008080;\">#use QDA model to make predictions on test data\n<\/span>predicted &lt;- <span style=\"color: #3366ff;\">predict<\/span> (model, test)\n\nnames(predicted)\n\n[1] \"class\" \"posterior\" \"x\"   \n<\/strong><\/pre>\n<p><span style=\"color: #000000;\">\u8fd9\u5c06\u8fd4\u56de\u4e00\u4e2a\u5305\u542b\u4e24\u4e2a\u53d8\u91cf\u7684\u5217\u8868\uff1a<\/span><\/p>\n<ul>\n<li><span style=\"color: #000000;\"><strong>\u7c7b\u522b\uff1a<\/strong>\u9884\u6d4b\u7c7b\u522b<\/span><\/li>\n<li><span style=\"color: #000000;\"><strong>\u540e\u9a8c\uff1a<\/strong>\u89c2\u5bdf\u7ed3\u679c\u5c5e\u4e8e\u6bcf\u4e2a\u7c7b\u522b\u7684<a href=\"https:\/\/statorials.org\/cn\/\u540e\u9a8c\u6982\u7387\/\" target=\"_blank\" rel=\"noopener noreferrer\">\u540e\u9a8c\u6982\u7387<\/a><\/span><\/li>\n<\/ul>\n<p><span style=\"color: #000000;\">\u6211\u4eec\u53ef\u4ee5\u5feb\u901f\u53ef\u89c6\u5316\u6d4b\u8bd5\u6570\u636e\u96c6\u4e2d\u524d\u516d\u4e2a\u89c2\u5bdf\u7ed3\u679c\u7684\u6bcf\u4e00\u4e2a\u7ed3\u679c\uff1a<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #008080;\">#view predicted class for first six observations in test set\n<\/span>head(predicted$class)\n\n[1] setosa setosa setosa setosa setosa setosa\nLevels: setosa versicolor virginica\n\n<span style=\"color: #008080;\">#view posterior probabilities for first six observations in test set<\/span>\nhead(predicted$posterior)\n\n   setosa versicolor virginica\n4 1 7.224770e-20 1.642236e-29\n6 1 6.209196e-26 8.550911e-38\n7 1 1.248337e-21 8.132700e-32\n15 1 2.319705e-35 5.094803e-50\n17 1 1.396840e-29 9.586504e-43\n18 1 7.581165e-25 8.611321e-37\n<\/strong><\/pre>\n<h3><span style=\"color: #000000;\"><strong>\u7b2c 6 \u6b65\uff1a\u8bc4\u4f30\u6a21\u578b<\/strong><\/span><\/h3>\n<p><span style=\"color: #000000;\">\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u4ee3\u7801\u6765\u67e5\u770b QDA \u6a21\u578b\u6b63\u786e\u9884\u6d4b\u7269\u79cd\u7684\u89c2\u6d4b\u767e\u5206\u6bd4\uff1a<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #008080;\">#find accuracy of model\n<\/span>mean(predicted$class==test$Species)\n\n[1] 1<\/strong><\/pre>\n<p><span style=\"color: #000000;\">\u4e8b\u5b9e\u8bc1\u660e\uff0c\u8be5\u6a21\u578b\u6b63\u786e\u9884\u6d4b\u4e86\u6d4b\u8bd5\u6570\u636e\u96c6\u4e2d<strong>100%<\/strong>\u7684\u89c2\u6d4b\u503c\u7684\u7269\u79cd\u3002<\/span><\/p>\n<p><span style=\"color: #000000;\">\u5728\u73b0\u5b9e\u4e16\u754c\u4e2d\uff0cQDA \u6a21\u578b\u5f88\u5c11\u80fd\u6b63\u786e\u9884\u6d4b\u6bcf\u4e2a\u7c7b\u522b\u7684\u7ed3\u679c\uff0c\u4f46\u8fd9\u4e2a\u8679\u819c\u6570\u636e\u96c6\u7684\u6784\u9020\u65b9\u5f0f\u5f88\u7b80\u5355\uff0c\u673a\u5668\u5b66\u4e60\u7b97\u6cd5\u5f80\u5f80\u8868\u73b0\u826f\u597d\u3002<\/span><\/p>\n<p><span style=\"color: #000000;\">\u60a8\u53ef\u4ee5<a href=\"https:\/\/github.com\/Statorials\/R-Guides\/blob\/main\/quadratic_discriminant_analysis\" target=\"_blank\" rel=\"noopener noreferrer\">\u5728\u6b64\u5904<\/a>\u627e\u5230\u672c\u6559\u7a0b\u4e2d\u4f7f\u7528\u7684\u5b8c\u6574 R \u4ee3\u7801\u3002<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5f53\u60a8\u6709\u4e00\u7ec4\u9884\u6d4b\u53d8\u91cf\u5e76\u4e14\u60f3\u8981\u5c06\u54cd\u5e94\u53d8\u91cf\u5206\u7c7b\u4e3a\u4e24\u4e2a\u6216\u591a\u4e2a\u7c7b\u65f6\uff0c\u53ef\u4ee5\u4f7f\u7528 \u4e8c\u6b21\u5224\u522b\u5206\u6790\u65b9\u6cd5\u3002\u5b83\u88ab\u8ba4\u4e3a\u662f\u7ebf\u6027\u5224\u522b\u5206\u6790\u7684 [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[11],"tags":[],"class_list":["post-1168","post","type-post","status-publish","format-standard","hentry","category-11"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v21.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>R \u4e2d\u7684\u4e8c\u6b21\u5224\u522b\u5206\u6790\uff08\u4e00\u6b65\u4e00\u6b65\uff09<\/title>\n<meta name=\"description\" content=\"\u672c\u6559\u7a0b\u4ecb\u7ecd\u5982\u4f55\u5728 R \u4e2d\u6267\u884c\u4e8c\u6b21\u5224\u522b\u5206\u6790\uff0c\u5305\u62ec\u5206\u6b65\u793a\u4f8b\u3002\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/statorials.org\/cn\/r\u4e2d\u7684\u4e8c\u6b21\u5224\u522b\u5206\u6790\/\" \/>\n<meta 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