{"id":3216,"date":"2023-07-18T15:39:28","date_gmt":"2023-07-18T15:39:28","guid":{"rendered":"https:\/\/statorials.org\/cn\/r%e4%b8%ad%e7%9a%84%e6%8f%8f%e8%bf%b0%e6%80%a7%e7%bb%9f%e8%ae%a1\/"},"modified":"2023-07-18T15:39:28","modified_gmt":"2023-07-18T15:39:28","slug":"r%e4%b8%ad%e7%9a%84%e6%8f%8f%e8%bf%b0%e6%80%a7%e7%bb%9f%e8%ae%a1","status":"publish","type":"post","link":"https:\/\/statorials.org\/cn\/r%e4%b8%ad%e7%9a%84%e6%8f%8f%e8%bf%b0%e6%80%a7%e7%bb%9f%e8%ae%a1\/","title":{"rendered":"\u5982\u4f55\u5728 r \u4e2d\u8ba1\u7b97\u63cf\u8ff0\u6027\u7edf\u8ba1\uff08\u9644\u793a\u4f8b\uff09"},"content":{"rendered":"<p><\/p>\n<hr>\n<p><span style=\"color: #000000;\"><strong>\u63cf\u8ff0\u6027\u7edf\u8ba1<\/strong>\u662f\u63cf\u8ff0\u4e00\u7ec4\u6570\u636e\u7684\u503c\u3002<\/span><\/p>\n<p><span style=\"color: #000000;\">\u5b83\u4eec\u5e2e\u52a9\u6211\u4eec\u4e86\u89e3\u6570\u636e\u96c6\u7684<a href=\"https:\/\/statorials.org\/cn\/\u8861\u91cf\u96c6\u4e2d\u8d8b\u52bf\/\" target=\"_blank\" rel=\"noopener\">\u4e2d\u5fc3<\/a>\u5728\u54ea\u91cc\u4ee5\u53ca\u6570\u636e\u96c6\u4e2d\u503c\u7684\u5206\u5e03\u3002<\/span><\/p>\n<p><span style=\"color: #000000;\">\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528\u4e24\u4e2a\u51fd\u6570\u6765\u8ba1\u7b97 R \u4e2d\u7684\u63cf\u8ff0\u6027\u7edf\u8ba1\u91cf\uff1a<\/span><\/p>\n<p><span style=\"color: #000000;\"><strong>\u65b9\u6cd5\u4e00\uff1a\u4f7f\u7528summary()\u51fd\u6570<\/strong><\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong>summary(my_data)<\/strong><\/pre>\n<p><span style=\"color: #000000;\"><strong>summary()<\/strong>\u51fd\u6570\u8ba1\u7b97 R \u4e2d\u6570\u636e\u5e27\u4e2d\u6bcf\u4e2a\u53d8\u91cf\u7684\u4ee5\u4e0b\u503c\uff1a<\/span><\/p>\n<ul>\n<li><span style=\"color: #000000;\"><span style=\"color: #000000;\">\u6700\u4f4e\u9650\u5ea6<\/span><\/span><\/li>\n<li><span style=\"color: #000000;\">\u7b2c\u4e00\u4e2a\u56db\u5206\u4f4d\u6570<\/span><\/li>\n<li><span style=\"color: #000000;\">\u4e2d\u4f4d\u6570<\/span><\/li>\n<li><span style=\"color: #000000;\">\u610f\u601d\u662f<\/span><\/li>\n<li><span style=\"color: #000000;\">\u7b2c\u4e09\u4e2a\u56db\u5206\u4f4d\u6570<\/span><\/li>\n<li><span style=\"color: #000000;\">\u6700\u5927\u9650\u5ea6<\/span><\/li>\n<\/ul>\n<p><span style=\"color: #000000;\"><strong><span style=\"color: #000000;\">\u65b9\u6cd52\uff1a\u4f7f\u7528sapply()\u51fd\u6570<\/span><\/strong><\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong>sapply(my_data, sd, na. <span style=\"color: #3366ff;\">rm<\/span> = <span style=\"color: #008000;\">TRUE<\/span> )\n<\/strong><\/pre>\n<p><span style=\"color: #000000;\"><strong>sapply()<\/strong>\u51fd\u6570\u53ef\u7528\u4e8e\u8ba1\u7b97\u6570\u636e\u6846\u4e2d\u6bcf\u4e2a\u53d8\u91cf\u7684\u63cf\u8ff0\u6027\u7edf\u8ba1\u91cf\uff0c\u800c\u4e0d\u662f\u901a\u8fc7<strong>summary()<\/strong>\u51fd\u6570\u8ba1\u7b97\u7684\u7edf\u8ba1\u91cf\u3002<\/span><\/p>\n<p><span style=\"color: #000000;\">\u4f8b\u5982\uff0c\u4e0a\u9762\u7684<strong>sapply()<\/strong>\u51fd\u6570\u8ba1\u7b97\u6570\u636e\u6846\u4e2d\u6bcf\u4e2a\u53d8\u91cf\u7684\u6807\u51c6\u5dee\u3002<\/span><\/p>\n<p><span style=\"color: #000000;\">\u4ee5\u4e0b\u793a\u4f8b\u6f14\u793a\u5982\u4f55\u4f7f\u7528\u8fd9\u4e24\u4e2a\u51fd\u6570\u6765\u8ba1\u7b97 R \u6570\u636e\u6846\u4e2d\u53d8\u91cf\u7684\u63cf\u8ff0\u6027\u7edf\u8ba1\u91cf\u3002<\/span><\/p>\n<h2><span style=\"color: #000000;\"><strong>\u793a\u4f8b\uff1a\u5728 R \u4e2d\u8ba1\u7b97\u63cf\u8ff0\u6027\u7edf\u8ba1\u91cf<\/strong><\/span><\/h2>\n<p><span style=\"color: #000000;\">\u5047\u8bbe\u6211\u4eec\u5728 R \u4e2d\u6709\u4ee5\u4e0b\u6570\u636e\u6846\uff0c\u5176\u4e2d\u5305\u542b\u4e09\u4e2a\u53d8\u91cf\uff1a<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #008080;\">#create data frame\n<\/span>df &lt;- data. <span style=\"color: #3366ff;\">frame<\/span> (x=c(1, 4, 4, 5, 6, 7, 10, 12),\n                 y=c(2, 2, 3, 3, 4, 5, 11, 11),\n                 z=c(8, 9, 9, 9, 10, 13, 15, 17))\n\n<span style=\"color: #008080;\">#view data frame\n<\/span>df\n\n   X Y Z\n1 1 2 8\n2 4 2 9\n3 4 3 9\n4 5 3 9\n5 6 4 10\n6 7 5 13\n7 10 11 15\n8 12 11 17<\/strong><\/pre>\n<p><span style=\"color: #000000;\">\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528<strong>summary()<\/strong>\u51fd\u6570\u6765\u8ba1\u7b97\u6bcf\u4e2a\u53d8\u91cf\u7684\u5404\u79cd\u63cf\u8ff0\u6027\u7edf\u8ba1\u6570\u636e\uff1a<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #008080;\">#calculate descriptive statistics for each variable<\/span>\nsummary(df)\n\n       xyz Min. : 1,000 Min. : 2,000 Min. : 8.00  \n 1st Qu.: 4,000 1st Qu.: 2,750 1st Qu.: 9.00  \n Median: 5,500 Median: 3,500 Median: 9.50  \n Mean: 6.125 Mean: 5.125 Mean: 11.25  \n 3rd Qu.: 7,750 3rd Qu.: 6,500 3rd Qu.: 13.50  \n Max. :12,000 Max. :11,000 Max. :17.00<\/strong><\/pre>\n<p><span style=\"color: #000000;\">\u6211\u4eec\u8fd8\u53ef\u4ee5\u4f7f\u7528\u62ec\u53f7\u4ec5\u8ba1\u7b97\u6570\u636e\u6846\u4e2d\u7279\u5b9a\u53d8\u91cf\u7684\u63cf\u8ff0\u6027\u7edf\u8ba1\u6570\u636e\uff1a<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #008080;\">#calculate descriptive statistics for 'x' and 'z' only<\/span>\nsummary(df[, c(' <span style=\"color: #ff0000;\">x<\/span> ', ' <span style=\"color: #ff0000;\">z<\/span> ')])\n\n       xz Min. : 1,000 Min. : 8.00  \n 1st Qu.: 4.000 1st Qu.: 9.00  \n Median: 5.500 Median: 9.50  \n Mean: 6.125 Mean: 11.25  \n 3rd Qu.: 7.750 3rd Qu.: 13.50  \n Max. :12,000 Max. :17.00 \n<\/strong><\/pre>\n<p><span style=\"color: #000000;\">\u6211\u4eec\u8fd8\u53ef\u4ee5\u4f7f\u7528<strong>sapply()<\/strong>\u51fd\u6570\u6765\u8ba1\u7b97\u6bcf\u4e2a\u53d8\u91cf\u7684\u5177\u4f53\u63cf\u8ff0\u7edf\u8ba1\u91cf\u3002<\/span><\/p>\n<p><span style=\"color: #000000;\">\u4f8b\u5982\uff0c\u4ee5\u4e0b\u4ee3\u7801\u663e\u793a\u4e86\u5982\u4f55\u8ba1\u7b97\u6bcf\u4e2a\u53d8\u91cf\u7684\u6807\u51c6\u5dee\uff1a<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #008080;\">#calculate standard deviation for each variable<\/span>\nsapply(df, sd, na. <span style=\"color: #3366ff;\">rm<\/span> = <span style=\"color: #008000;\">TRUE<\/span> )\n\n       X Y Z\n3.522884 3.758324 3.327376<\/strong><\/pre>\n<p><span style=\"color: #000000;\"><span style=\"color: #000000;\">\u6211\u4eec\u8fd8\u53ef\u4ee5\u4f7f\u7528<strong>sapply(<\/strong> <strong>) \u4e2d\u7684 function()<\/strong>\u6765\u8ba1\u7b97\u63cf\u8ff0\u6027\u7edf\u8ba1\u91cf\u3002<\/span><\/span><\/p>\n<p><span style=\"color: #000000;\">\u4f8b\u5982\uff0c\u4ee5\u4e0b\u4ee3\u7801\u663e\u793a\u5982\u4f55\u8ba1\u7b97\u6bcf\u4e2a\u53d8\u91cf\u7684<a href=\"https:\/\/statorials.org\/cn\/r-\u7684\u6d77\u6ee9\/\" target=\"_blank\" rel=\"noopener\">\u8303\u56f4<\/a>\uff1a<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #008080;\">#calculate range for each variable<\/span>\nsapply(df, function(df) max(df, na. <span style=\"color: #3366ff;\">rm<\/span> = <span style=\"color: #008000;\">TRUE<\/span> )-min(df, na. <span style=\"color: #3366ff;\">rm<\/span> = <span style=\"color: #008000;\">TRUE<\/span> ))\n\n X Y Z\n11 9 9\n<\/strong><\/pre>\n<p><span style=\"color: #000000;\"><span style=\"color: #000000;\">\u6700\u540e\uff0c\u6211\u4eec\u53ef\u4ee5\u521b\u5efa\u4e00\u4e2a\u590d\u6742\u7684\u51fd\u6570\u6765\u8ba1\u7b97\u63cf\u8ff0\u6027\u7edf\u8ba1\u91cf\uff0c\u7136\u540e\u5c06\u8be5\u51fd\u6570\u4e0e<strong>sapply()<\/strong>\u51fd\u6570\u4e00\u8d77\u4f7f\u7528\u3002<\/span><\/span><\/p>\n<p><span style=\"color: #000000;\">\u4f8b\u5982\uff0c\u4ee5\u4e0b\u4ee3\u7801\u663e\u793a\u4e86\u5982\u4f55\u8ba1\u7b97\u6570\u636e\u6846\u4e2d\u6bcf\u4e2a\u53d8\u91cf\u7684<a href=\"https:\/\/statorials.org\/cn\/r-\u4e2d\u7684\u6a21\u5f0f\/\" target=\"_blank\" rel=\"noopener\">\u4f17\u6570<\/a>\uff1a<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #008080;\">#define function that calculates mode<\/span>\nfind_mode &lt;- <span style=\"color: #008000;\">function<\/span> (x) {\n  u &lt;- unique(x)\n  tab &lt;- tabulate(match(x, u))\n  u[tab <span style=\"color: #3366ff;\">==<\/span> max(tab)]\n}\n\n<span style=\"color: #008080;\">#calculate mode for each variable\n<\/span>sapply(df, find_mode)\n\n$x\n[1] 4\n\n$y\n[1] 2 3 11\n\n$z\n[1] 9\n<\/strong><\/pre>\n<p><span style=\"color: #000000;\">\u4ece\u7ed3\u679c\u6211\u4eec\u53ef\u4ee5\u770b\u51fa\uff1a<\/span><\/p>\n<ul>\n<li><span style=\"color: #000000;\">\u53d8\u91cf x \u7684\u4f17\u6570\u4e3a<strong>4<\/strong> \u3002<\/span><\/li>\n<li> <span style=\"color: #000000;\">y \u53d8\u91cf\u7684\u4f17\u6570\u4e3a<strong>2<\/strong> \u3001 <strong>3<\/strong>\u548c<strong>11<\/strong> \uff08\u56e0\u4e3a\u8fd9\u4e9b\u503c\u4e2d\u7684\u6bcf\u4e00\u4e2a\u90fd\u51fa\u73b0\u6700\u9891\u7e41\uff09<\/span><\/li>\n<li><span style=\"color: #000000;\">\u53d8\u91cf z \u7684\u4f17\u6570\u4e3a<strong>9<\/strong> \u3002<\/span><\/li>\n<\/ul>\n<p><span style=\"color: #000000;\">\u4f7f\u7528<strong>summary()<\/strong>\u548c<strong>sapply()<\/strong>\u51fd\u6570\uff0c\u6211\u4eec\u53ef\u4ee5\u8ba1\u7b97\u6570\u636e\u6846\u4e2d\u6bcf\u4e2a\u53d8\u91cf\u6240\u9700\u7684\u4efb\u4f55\u63cf\u8ff0\u6027\u7edf\u8ba1\u6570\u636e\u3002<\/span><\/p>\n<h3><span style=\"color: #000000;\"><strong>\u5176\u4ed6\u8d44\u6e90<\/strong><\/span><\/h3>\n<p><span style=\"color: #000000;\">\u4ee5\u4e0b\u6559\u7a0b\u89e3\u91ca\u4e86\u5982\u4f55\u5728 R \u4e2d\u6267\u884c\u5176\u4ed6\u5e38\u89c1\u4efb\u52a1\uff1a<\/span><\/p>\n<p><a href=\"https:\/\/statorials.org\/cn\/r\u4e2d\u7684\u6c47\u603b\u8868\/\" target=\"_blank\" rel=\"noopener\">\u5982\u4f55\u5728 R \u4e2d\u521b\u5efa\u6c47\u603b\u8868<\/a><br \/><a href=\"https:\/\/statorials.org\/cn\/r-\u4e2d\u7684\u56db\u5206\u4f4d\u6570\u8303\u56f4\/\" target=\"_blank\" rel=\"noopener\">\u5982\u4f55\u5728R\u4e2d\u627e\u5230\u56db\u5206\u4f4d\u6570\u8303\u56f4<\/a><br \/><a href=\"https:\/\/statorials.org\/cn\/\u5220\u9664\u5f02\u5e38\u503c-r\/\" target=\"_blank\" rel=\"noopener\">\u5982\u4f55\u53bb\u9664R\u4e2d\u7684\u5f02\u5e38\u503c<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u63cf\u8ff0\u6027\u7edf\u8ba1\u662f\u63cf\u8ff0\u4e00\u7ec4\u6570\u636e\u7684\u503c\u3002 \u5b83\u4eec\u5e2e\u52a9\u6211\u4eec\u4e86\u89e3\u6570\u636e\u96c6\u7684\u4e2d\u5fc3\u5728\u54ea\u91cc\u4ee5\u53ca\u6570\u636e\u96c6\u4e2d\u503c\u7684\u5206\u5e03\u3002 \u6211\u4eec\u53ef\u4ee5\u4f7f\u7528\u4e24\u4e2a\u51fd\u6570 [&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-3216","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\u5728 R \u4e2d\u8ba1\u7b97\u63cf\u8ff0\u6027\u7edf\u8ba1\uff08\u9644\u793a\u4f8b\uff09- \u7edf\u8ba1\u5b66<\/title>\n<meta name=\"description\" content=\"\u672c\u6559\u7a0b\u901a\u8fc7\u4e00\u4e2a\u793a\u4f8b\u89e3\u91ca\u4e86\u5982\u4f55\u5728 R \u4e2d\u8ba1\u7b97\u63cf\u8ff0\u6027\u7edf\u8ba1\u91cf\u3002\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" 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