{"id":917,"date":"2023-07-28T08:02:55","date_gmt":"2023-07-28T08:02:55","guid":{"rendered":"https:\/\/statorials.org\/cn\/%e5%88%a0%e9%99%a4%e5%bc%82%e5%b8%b8%e5%80%bc-r\/"},"modified":"2023-07-28T08:02:55","modified_gmt":"2023-07-28T08:02:55","slug":"%e5%88%a0%e9%99%a4%e5%bc%82%e5%b8%b8%e5%80%bc-r","status":"publish","type":"post","link":"https:\/\/statorials.org\/cn\/%e5%88%a0%e9%99%a4%e5%bc%82%e5%b8%b8%e5%80%bc-r\/","title":{"rendered":"\u5982\u4f55\u53bb\u9664r\u4e2d\u7684\u5f02\u5e38\u503c"},"content":{"rendered":"<p><\/p>\n<hr>\n<p><span style=\"color: #000000;\"><strong>\u5f02\u5e38\u503c<\/strong>\u662f\u4e0e\u6570\u636e\u96c6\u4e2d\u7684\u5176\u4ed6\u503c\u5f02\u5e38\u8fdc\u79bb\u7684\u89c2\u5bdf\u503c\u3002\u5f02\u5e38\u503c\u53ef\u80fd\u4f1a\u4ea7\u751f\u95ee\u9898\uff0c\u56e0\u4e3a\u5b83\u4eec\u4f1a\u5f71\u54cd\u5206\u6790\u7ed3\u679c\u3002<\/span><\/p>\n<p><span style=\"color: #000000;\">\u672c\u6559\u7a0b\u4ecb\u7ecd\u5982\u4f55\u5728 R \u4e2d\u8bc6\u522b\u548c\u5220\u9664\u5f02\u5e38\u503c\u3002<\/span><\/p>\n<h3><span style=\"color: #000000;\"><strong>\u5982\u4f55\u8bc6\u522b R \u4e2d\u7684\u5f02\u5e38\u503c<\/strong><\/span><\/h3>\n<p><span style=\"color: #000000;\">\u5728\u5220\u9664\u5f02\u5e38\u503c\u4e4b\u524d\uff0c\u60a8\u5fc5\u987b\u9996\u5148\u786e\u5b9a\u4ec0\u4e48\u662f\u5f02\u5e38\u503c\u3002\u6709\u4e24\u79cd\u5e38\u89c1\u7684\u65b9\u6cd5\u53ef\u4ee5\u505a\u5230\u8fd9\u4e00\u70b9\uff1a<\/span><\/p>\n<p> <span style=\"color: #000000;\"><strong>1. \u4f7f\u7528\u56db\u5206\u4f4d\u8ddd\u3002<\/strong><\/span><\/p>\n<p><span style=\"color: #000000;\">\u56db\u5206\u4f4d\u8ddd (IQR) \u662f\u6570\u636e\u96c6\u4e2d\u7b2c 75 \u4e2a\u767e\u5206\u4f4d\u6570 (Q3) \u548c\u7b2c 25 \u4e2a\u767e\u5206\u4f4d\u6570 (Q1) \u4e4b\u95f4\u7684\u5dee\u503c\u3002\u5b83\u6d4b\u91cf\u5e73\u5747 50% \u503c\u7684\u5206\u5e03\u3002<\/span><\/p>\n<p><span style=\"color: #000000;\">\u5982\u679c\u67d0\u4e2a\u89c2\u6d4b\u503c\u662f\u7b2c\u4e09\u4e2a\u56db\u5206\u4f4d (Q3) \u4e0a\u65b9\u56db\u5206\u4f4d\u8ddd\u7684 1.5 \u500d\u6216\u7b2c\u4e00\u4e2a\u56db\u5206\u4f4d (Q1) \u4e0b\u65b9\u56db\u5206\u4f4d\u8ddd\u7684 1.5 \u500d\uff0c\u5219\u53ef\u4ee5\u5c06\u5176\u5b9a\u4e49\u4e3a\u79bb\u7fa4\u503c\u3002<\/span><\/p>\n<p><span style=\"color: #000000;\"><strong>\u5f02\u5e38\u503c = \u89c2\u6d4b\u503c &gt; Q3 + 1.5*IQR \u6216 &lt; Q1 \u2013 1.5*IQR<\/strong><\/span><\/p>\n<p> <span style=\"color: #000000;\"><strong>2. \u4f7f\u7528 z \u5206\u6570\u3002<\/strong><\/span><\/p>\n<p> <span style=\"color: #000000;\"><a href=\"https:\/\/statorials.org\/cn\/\u5206\u6570\/\" target=\"_blank\" rel=\"noopener noreferrer\">z \u5206\u6570<\/a>\u544a\u8bc9\u60a8\u7ed9\u5b9a\u503c\u4e0e\u5e73\u5747\u503c\u7684\u6807\u51c6\u5dee\u6709\u591a\u5c11\u3002\u6211\u4eec\u4f7f\u7528\u4ee5\u4e0b\u516c\u5f0f\u6765\u8ba1\u7b97 z \u5206\u6570\uff1a<\/span><\/p>\n<p> <span style=\"color: #000000;\"><strong>z<\/strong> = (X \u2013 \u03bc) \/ \u03c3<\/span><\/p>\n<p><span style=\"color: #000000;\">\u91d1\u5b50\uff1a<\/span><\/p>\n<ul>\n<li> <span style=\"color: #000000;\">X \u662f\u5355\u4e2a\u539f\u59cb\u6570\u636e\u503c<\/span><\/li>\n<li><span style=\"color: #000000;\">\u03bc \u662f\u603b\u4f53\u5e73\u5747\u503c<\/span><\/li>\n<li><span style=\"color: #000000;\">\u03c3 \u662f\u603b\u4f53\u6807\u51c6\u5dee<\/span><\/li>\n<\/ul>\n<p><span style=\"color: #000000;\">\u5982\u679c\u67d0\u4e2a\u89c2\u6d4b\u503c\u7684 z \u5206\u6570\u5c0f\u4e8e -3 \u6216\u5927\u4e8e 3\uff0c\u5219\u53ef\u4ee5\u5c06\u5176\u5b9a\u4e49\u4e3a\u79bb\u7fa4\u503c\u3002<\/span><\/p>\n<p><span style=\"color: #000000;\"><strong>\u79bb\u7fa4\u503c = z \u5206\u6570 &gt; 3 \u6216 &lt; -3 \u7684\u89c2\u6d4b\u503c<\/strong><\/span><\/p>\n<h3><span style=\"color: #000000;\"><strong>\u5982\u4f55\u53bb\u9664R\u4e2d\u7684\u5f02\u5e38\u503c<\/strong><\/span><\/h3>\n<p><span style=\"color: #000000;\">\u4e00\u65e6\u786e\u5b9a\u4e86\u5f02\u5e38\u503c\uff0c\u60a8\u5c31\u53ef\u4ee5\u8bc6\u522b\u5b83\u4eec\u5e76\u5c06\u5176\u4ece\u6570\u636e\u96c6\u4e2d\u5220\u9664\u3002\u4e3a\u4e86\u8bf4\u660e\u5982\u4f55\u505a\u5230\u8fd9\u4e00\u70b9\uff0c\u6211\u4eec\u5c06\u4f7f\u7528\u4ee5\u4e0b\u6570\u636e\u6846\uff1a<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #008080;\">#make this example reproducible<\/span> \nset.seed(0)\n\n<span style=\"color: #008080;\">#create data frame with three columns A', 'B', 'C'<\/span> \ndf &lt;- data.frame(A=rnorm(1000, mean=10, sd=3),\n                 B=rnorm(1000, mean=20, sd=3),\n                 C=rnorm(1000, mean=30, sd=3))\n\n<span style=\"color: #008080;\">#view first six rows of data frame<\/span>\nhead(df)\n         ABC\n1 13.78886 19.13945 31.33304\n2 9.02130 25.52332 30.03579\n3 13.98940 19.52971 29.97216\n4 13.81729 15.83059 29.09287\n5 11.24392 15.58069 31.47707\n6 5.38015 19.79144 28.19184\n<\/strong><\/pre>\n<p><span style=\"color: #000000;\">\u7136\u540e\uff0c\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528 z \u5206\u6570\u65b9\u6cd5\u6216\u56db\u5206\u4f4d\u6570\u8303\u56f4\u65b9\u6cd5\u5b9a\u4e49\u548c\u5220\u9664\u5f02\u5e38\u503c\uff1a<\/span><\/p>\n<p> <span style=\"color: #000000;\"><strong>Z\u5206\u6570\u65b9\u6cd5\uff1a<\/strong><\/span><\/p>\n<p><span style=\"color: #000000;\">\u4ee5\u4e0b\u4ee3\u7801\u5c55\u793a\u4e86\u5982\u4f55\u8ba1\u7b97\u6570\u636e\u5e27\u6bcf\u4e00\u5217\u4e2d\u6bcf\u4e2a\u503c\u7684 z \u5206\u6570\uff0c\u7136\u540e\u5220\u9664\u81f3\u5c11\u6709\u4e00\u4e2a z \u5206\u6570\u7edd\u5bf9\u503c\u5927\u4e8e 3 \u7684\u884c\uff1a<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #008080;\">#find absolute value of z-score for each value in each column<\/span>\nz_scores &lt;- <span style=\"color: #3366ff;\">as.data.frame<\/span> (sapply(df, function(df) (abs(df-mean(df))\/sd(df))))\n\n<span style=\"color: #008080;\">#view first six rows of z_scores data frame\n<\/span>head(z_scores)\n\n          ABC\n1 1.2813403 0.25350805 0.39419878\n2 0.3110243 1.80496734 0.05890232\n3 1.3483190 0.12766847 0.08112630\n4 1.2908343 1.32044506 0.38824414\n5 0.4313316 1.40102642 0.44450451\n6 1.5271674 0.04327186 0.70295309\n\n<span style=\"color: #008080;\">#only keep rows in dataframe with all z-scores less than absolute value of 3<\/span> \nno_outliers &lt;- z_scores[!rowSums(z_scores&gt;3), ]\n\n<span style=\"color: #008080;\">#view row and column count of new data frame<\/span>\ndim(no_outliers)\n\n[1] 994 3\n<\/strong><\/pre>\n<p><span style=\"color: #000000;\">\u539f\u59cb\u6570\u636e\u6846\u6709 1000 \u884c\u548c 3 \u5217\u3002\u65b0\u6570\u636e\u6846\u6709 994 \u884c\u548c 3 \u5217\uff0c\u8fd9\u544a\u8bc9\u6211\u4eec\u5220\u9664\u4e86 6 \u884c\uff0c\u56e0\u4e3a\u5b83\u4eec\u7684\u5176\u4e2d\u4e00\u5217\u4e2d\u81f3\u5c11\u6709\u4e00\u4e2a z \u5206\u6570\u7684\u7edd\u5bf9\u503c\u5927\u4e8e 3\u3002<\/span><\/p>\n<p><span style=\"color: #000000;\"><strong>\u56db\u5206\u4f4d\u8ddd\u6cd5\uff1a<\/strong><\/span><\/p>\n<p><span style=\"color: #000000;\">\u5728\u67d0\u4e9b\u60c5\u51b5\u4e0b\uff0c\u6211\u4eec\u53ef\u80fd\u53ea\u60f3\u8bc6\u522b\u6570\u636e\u6846\u5217\u4e2d\u7684\u5f02\u5e38\u503c\u3002\u4f8b\u5982\uff0c\u5047\u8bbe\u6211\u4eec\u53ea\u60f3\u5220\u9664\u6570\u636e\u6846\u201cA\u201d\u5217\u4e2d\u5177\u6709\u5f02\u5e38\u503c\u7684\u884c\u3002<\/span><\/p>\n<p><span style=\"color: #000000;\">\u4ee5\u4e0b\u4ee3\u7801\u663e\u793a\u5982\u4f55\u4ece\u6570\u636e\u6846\u4e2d\u5220\u9664\u884c\uff0c\u5176\u201cA\u201d\u5217\u4e2d\u7684\u503c\u662f\u7b2c\u4e09\u4e2a\u56db\u5206\u4f4d\u6570 (Q3) \u4e0a\u65b9\u56db\u5206\u4f4d\u95f4\u8ddd\u7684 1.5 \u500d\u6216\u7b2c\u4e00\u4e2a\u56db\u5206\u4f4d (Q1) \u4e0b\u65b9\u56db\u5206\u4f4d\u95f4\u8ddd\u7684 1.5 \u500d\u3002 \u3002<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #008080;\">#find Q1, Q3, and interquartile range for values in column A<\/span>\nQ1 &lt;- quantile(df$A, .25)\nQ3 &lt;- quantile(df$A, .75)\nIQR &lt;- IQR(df$A)\n\n<span style=\"color: #008080;\">#only keep rows in dataframe that have values within 1.5*IQR of Q1 and Q3<\/span>\nno_outliers &lt;- subset(df, df$A&gt; (Q1 - 1.5*IQR) &amp; df$A&lt; (Q3 + 1.5*IQR))\n\n<span style=\"color: #008080;\">#view row and column count of new data frame\n<\/span>dim(no_outliers) \n\n[1] 994 3<\/strong><\/pre>\n<p><span style=\"color: #000000;\">\u539f\u59cb\u6570\u636e\u6846\u6709 1000 \u884c\u548c 3 \u5217\u3002\u65b0\u6570\u636e\u6846\u6709 994 \u884c\u548c 3 \u5217\uff0c\u8fd9\u544a\u8bc9\u6211\u4eec\u5220\u9664\u4e86 6 \u884c\uff0c\u56e0\u4e3a\u5b83\u4eec\u5728 A \u5217\u4e2d\u81f3\u5c11\u5305\u542b\u4e00\u4e2a\u5f02\u5e38\u503c\u3002<\/span><\/p>\n<h3><strong>\u4f55\u65f6\u5220\u9664\u5f02\u5e38\u503c<\/strong><\/h3>\n<p><span style=\"color: #000000;\">\u5982\u679c\u5b58\u5728\u4e00\u4e2a\u6216\u591a\u4e2a\u5f02\u5e38\u503c\uff0c\u60a8\u5fc5\u987b\u9996\u5148\u9a8c\u8bc1\u5b83\u4eec\u662f\u5426\u4e0d\u662f\u6570\u636e\u8f93\u5165\u9519\u8bef\u7684\u7ed3\u679c\u3002\u6709\u65f6\uff0c\u4e2a\u4eba\u5728\u4fdd\u5b58\u6570\u636e\u65f6\u53ea\u662f\u8f93\u5165\u4e86\u9519\u8bef\u7684\u6570\u636e\u503c\u3002<\/span><\/p>\n<p><span style=\"color: #000000;\">\u5982\u679c\u5f02\u5e38\u503c\u662f\u6570\u636e\u8f93\u5165\u9519\u8bef\u7684\u7ed3\u679c\uff0c\u60a8\u53ef\u4ee5\u51b3\u5b9a\u4e3a\u5176\u5206\u914d\u4e00\u4e2a\u65b0\u503c\uff0c\u4f8b\u5982\u6570\u636e\u96c6\u7684 <a href=\"https:\/\/statorials.org\/cn\/\u8861\u91cf\u96c6\u4e2d\u8d8b\u52bf\/\" target=\"_blank\" rel=\"noopener noreferrer\">\u5e73\u5747\u503c\u6216\u4e2d\u4f4d\u6570<\/a>\u3002<\/span><\/p>\n<p><span style=\"color: #000000;\">\u5982\u679c\u8be5\u503c\u786e\u5b9e\u662f\u5f02\u5e38\u503c\uff0c\u5e76\u4e14\u4f1a\u5bf9\u60a8\u7684\u6574\u4f53\u5206\u6790\u4ea7\u751f\u91cd\u5927\u5f71\u54cd\uff0c\u5219\u60a8\u53ef\u4ee5\u9009\u62e9\u5c06\u5176\u5220\u9664\u3002\u8bf7\u52a1\u5fc5\u5728\u6700\u7ec8\u62a5\u544a\u6216\u5206\u6790\u4e2d\u63d0\u53ca\u60a8\u5220\u9664\u4e86\u5f02\u5e38\u503c\u3002<\/span><\/p>\n<h3><span style=\"color: #000000;\"><strong>\u5176\u4ed6\u8d44\u6e90<\/strong><\/span><\/h3>\n<p><span style=\"color: #000000;\">\u5728\u672c\u6559\u7a0b\u4e2d\uff0c\u6211\u4eec\u4f7f\u7528<strong>rnorm()<\/strong>\u751f\u6210\u6b63\u6001\u5206\u5e03\u968f\u673a\u53d8\u91cf\u7684\u5411\u91cf\uff0c\u7ed9\u5b9a\u5411\u91cf\u957f\u5ea6<em>n<\/em> \u3001\u603b\u4f53\u5e73\u5747\u503c<em>\u03bc<\/em>\u548c\u603b\u4f53\u6807\u51c6\u5dee<em>\u03c3<\/em> \u3002\u60a8\u53ef\u4ee5<a href=\"https:\/\/statorials.org\/cn\/r-\u4e2d\u7684-dnorm-pnorm-rnorm-qnorm\/\" target=\"_blank\" rel=\"noopener noreferrer\">\u5728\u6b64\u5904<\/a>\u4e86\u89e3\u6709\u5173\u6b64\u529f\u80fd\u7684\u66f4\u591a\u4fe1\u606f\u3002<\/span><\/p>\n<p><span style=\"color: #000000;\">\u6211\u4eec\u8fd8\u4f7f\u7528<strong>sapply()<\/strong>\u5c06\u51fd\u6570\u5e94\u7528\u4e8e\u8ba1\u7b97 z \u5206\u6570\u7684\u6570\u636e\u6846\u4e2d\u7684\u6bcf\u4e00\u5217\u3002\u60a8\u53ef\u4ee5<a href=\"https:\/\/statorials.org\/cn\/\u5728-r-\u4e2d\u5e94\u7528-lapply-sapply-\u548c-tapply-\u7684\u6307\u5357\/\" target=\"_blank\" rel=\"noopener noreferrer\">\u5728\u6b64\u5904<\/a>\u4e86\u89e3\u6709\u5173\u6b64\u529f\u80fd\u7684\u66f4\u591a\u4fe1\u606f\u3002<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5f02\u5e38\u503c\u662f\u4e0e\u6570\u636e\u96c6\u4e2d\u7684\u5176\u4ed6\u503c\u5f02\u5e38\u8fdc\u79bb\u7684\u89c2\u5bdf\u503c\u3002\u5f02\u5e38\u503c\u53ef\u80fd\u4f1a\u4ea7\u751f\u95ee\u9898\uff0c\u56e0\u4e3a\u5b83\u4eec\u4f1a\u5f71\u54cd\u5206\u6790\u7ed3\u679c\u3002 \u672c\u6559\u7a0b\u4ecb\u7ecd\u5982\u4f55\u5728  [&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-917","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>\u5982\u4f55\u5220\u9664 R \u4e2d\u7684\u5f02\u5e38\u503c - Statorials<\/title>\n<meta name=\"description\" content=\"\u5173\u4e8e\u5982\u4f55\u5728 R \u4e2d\u5220\u9664\u5f02\u5e38\u503c\u7684\u7b80\u5355\u8bf4\u660e\uff0c\u5305\u62ec\u51e0\u4e2a\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\/\u5220\u9664\u5f02\u5e38\u503c-r\/\" \/>\n<meta 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