{"id":2967,"date":"2023-07-19T21:02:07","date_gmt":"2023-07-19T21:02:07","guid":{"rendered":"https:\/\/statorials.org\/cn\/r-%e4%b8%ad%e5%8d%a1%e6%96%b9%e7%9a%84%e5%88%86%e5%b8%83-dchisq-pchisq-qchisq-rchisq\/"},"modified":"2023-07-19T21:02:07","modified_gmt":"2023-07-19T21:02:07","slug":"r-%e4%b8%ad%e5%8d%a1%e6%96%b9%e7%9a%84%e5%88%86%e5%b8%83-dchisq-pchisq-qchisq-rchisq","status":"publish","type":"post","link":"https:\/\/statorials.org\/cn\/r-%e4%b8%ad%e5%8d%a1%e6%96%b9%e7%9a%84%e5%88%86%e5%b8%83-dchisq-pchisq-qchisq-rchisq\/","title":{"rendered":"R \u4e2d\u7684\u5361\u65b9\u5206\u5e03\uff1adchisq\u3001pchisq\u3001qchisq\u3001rchisq"},"content":{"rendered":"<p><\/p>\n<hr>\n<p><span style=\"color: #000000;\">\u672c\u6559\u7a0b\u4ecb\u7ecd\u5982\u4f55\u4f7f\u7528\u4ee5\u4e0b\u51fd\u6570\u5728 R \u4e2d\u4f7f\u7528\u5361\u65b9\u5206\u5e03\uff1a<\/span><\/p>\n<ul>\n<li> <span style=\"color: #000000;\"><strong>dchisq<\/strong> \uff1a\u8fd4\u56de\u5361\u65b9\u6982\u7387\u5bc6\u5ea6\u51fd\u6570\u7684\u503c\u3002<\/span><\/li>\n<li> <span style=\"color: #000000;\"><strong>pchisq<\/strong> \uff1a\u8fd4\u56de\u5361\u65b9\u7d2f\u79ef\u5bc6\u5ea6\u51fd\u6570\u7684\u503c\u3002<\/span><\/li>\n<li> <span style=\"color: #000000;\"><strong>qchisq<\/strong> \uff1a\u8fd4\u56de\u5361\u65b9\u5206\u4f4d\u6570\u51fd\u6570\u7684\u503c\u3002<\/span><\/li>\n<li> <span style=\"color: #000000;\"><strong>rchisq<\/strong> \uff1a\u751f\u6210\u5361\u65b9\u5206\u5e03\u968f\u673a\u53d8\u91cf\u7684\u5411\u91cf\u3002<\/span><\/li>\n<\/ul>\n<p><span style=\"color: #000000;\">\u4ee5\u4e0b\u793a\u4f8b\u5c55\u793a\u4e86\u5982\u4f55\u5728\u5b9e\u8df5\u4e2d\u4f7f\u7528\u6bcf\u4e2a\u51fd\u6570\u3002<\/span><\/p>\n<h2> <strong><span style=\"color: #000000;\">dchisq<\/span><\/strong><\/h2>\n<p><span style=\"color: #000000;\"><span style=\"color: #000000;\">\u6211\u4eec\u7ecf\u5e38\u4f7f\u7528<strong>dchisq()<\/strong>\u51fd\u6570\u548c<strong>Curve()<\/strong>\u51fd\u6570\u6765\u7ed8\u5236\u5177\u6709\u4e00\u5b9a\u81ea\u7531\u5ea6\u7684\u5361\u65b9\u5206\u5e03\u3002<\/span><\/span><\/p>\n<p><span style=\"color: #000000;\">\u4f8b\u5982\uff0c\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u4ee3\u7801\u6765\u7ed8\u5236\u5177\u6709 5 \u4e2a\u81ea\u7531\u5ea6\u7684\u5361\u65b9\u5206\u5e03\uff1a<\/span> <\/p>\n<pre style=\"background-color: #e5e5e5; font-size: 15px;\"> <strong><span style=\"color: #008080;\">#plot Chi_Square distribution with 5 degrees of freedom<\/span>\ncurve(dchisq(x, df= <span style=\"color: #008000;\">5<\/span> ), from= <span style=\"color: #008000;\">0<\/span> , to= <span style=\"color: #008000;\">20<\/span> )\n<\/strong><\/pre>\n<p><img decoding=\"async\" loading=\"lazy\" class=\" wp-image-25700 aligncenter\" src=\"https:\/\/statorials.org\/wp-content\/uploads\/2023\/08\/chisq1.jpg\" alt=\"\" width=\"441\" height=\"406\" srcset=\"\" sizes=\"auto, \"><\/p>\n<p> <span style=\"color: #000000;\"><span style=\"color: #000000;\">x \u8f74\u663e\u793a\u5361\u65b9\u68c0\u9a8c\u7edf\u8ba1\u91cf\u7684\u503c\uff0cy \u8f74\u663e\u793a\u6982\u7387\u5bc6\u5ea6\u51fd\u6570\u7684\u76f8\u5e94\u503c\u3002<\/span><\/span><\/p>\n<p><span style=\"color: #000000;\"><strong>\u76f8\u5173\uff1a<\/strong><a href=\"https:\/\/statorials.org\/cn\/\u7ed8\u5236-r-\u4e2d\u7684\u5361\u65b9\u5206\u5e03\/\" target=\"_blank\" rel=\"noopener\">\u5982\u4f55\u5728 R \u4e2d\u8f7b\u677e\u7ed8\u5236\u5361\u65b9\u5206\u5e03<\/a><\/span><\/p>\n<h2><strong><span style=\"color: #000000;\">\u666e\u5947\u65af\u514b<\/span><\/strong><\/h2>\n<p><span style=\"color: #000000;\">\u6211\u4eec\u7ecf\u5e38\u4f7f\u7528<strong>pchisq()<\/strong> <b>&nbsp;<\/b>\u51fd\u6570\u67e5\u627e\u4e0e\u7ed9\u5b9a\u5361\u65b9\u68c0\u9a8c\u7edf\u8ba1\u91cf\u76f8\u5bf9\u5e94\u7684<a href=\"https:\/\/statorials.org\/cn\/p\u503c\u7edf\u8ba1\u663e\u7740\u6027\/\" target=\"_blank\" rel=\"noopener\">p \u503c<\/a>\u3002<\/span><\/p>\n<p><span style=\"color: #000000;\">\u4f8b\u5982\uff0c\u5047\u8bbe\u6211\u4eec\u6267\u884c<a href=\"https:\/\/statorials.org\/cn\/r\u4e2d\u7684\u5361\u65b9\u72ec\u7acb\u6027\u68c0\u9a8c\/\" target=\"_blank\" rel=\"noopener\">\u5361\u65b9\u72ec\u7acb\u6027\u68c0\u9a8c<\/a>\u5e76\u83b7\u5f97\u5177\u6709 2 \u4e2a\u81ea\u7531\u5ea6\u7684\u68c0\u9a8c\u7edf\u8ba1\u91cf<sup>X2<\/sup> = 0.86404\u3002<\/span><\/p>\n<p><span style=\"color: #000000;\">\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528<strong>pchisq()<\/strong>\u51fd\u6570\u6765\u67e5\u627e\u4e0e\u6b64\u68c0\u9a8c\u7edf\u8ba1\u91cf\u76f8\u5bf9\u5e94\u7684 p \u503c\uff1a<\/span><\/p>\n<pre style=\"background-color: #e5e5e5; font-size: 15px;\"> <strong><span style=\"color: #008080;\">#calculate p-value for given test statistic with 2 degrees of freedom<\/span>\n1-pchisq(0.86404, df= <span style=\"color: #008000;\">2<\/span> )\n\n[1] 0.6491964\n<\/strong><\/pre>\n<p> <span style=\"color: #000000;\">p \u503c\u4e3a<strong>0.6491964<\/strong> \u3002<\/span><\/p>\n<p><span style=\"color: #000000;\">\u6211\u4eec\u8fd8\u53ef\u4ee5\u901a\u8fc7\u4f7f\u7528<a href=\"https:\/\/statorials.org\/cn\/\u5361\u65b9-p-\u503c\u8ba1\u7b97\u5668\/\" target=\"_blank\" rel=\"noopener\">\u5361\u65b9\u5206\u6570\u5230 P \u503c\u8ba1\u7b97\u5668\u6765\u786e\u8ba4\u8fd9\u662f\u6b63\u786e\u7684\u3002<\/a><\/span><\/p>\n<h2><strong><span style=\"color: #000000;\">\u67d0\u7269<\/span><\/strong><\/h2>\n<p><span style=\"color: #000000;\">\u6211\u4eec\u7ecf\u5e38\u4f7f\u7528<strong>qchisq()<\/strong> <b>&nbsp;<\/b>\u51fd\u6570\u6765\u67e5\u627e\u4e0e\u7ed9\u5b9a\u663e\u7740\u6027\u6c34\u5e73\u548c\u81ea\u7531\u5ea6\u76f8\u5bf9\u5e94\u7684\u4e34\u754c\u5361\u65b9\u503c\u3002<\/span><\/p>\n<p><span style=\"color: #000000;\">\u4f8b\u5982\uff0c\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u4ee3\u7801\u6765\u67e5\u627e\u4e0e 13 \u4e2a\u81ea\u7531\u5ea6\u7684\u663e\u7740\u6027\u6c34\u5e73 0.05 \u76f8\u5bf9\u5e94\u7684\u4e34\u754c\u5361\u65b9\u503c\uff1a<\/span><\/p>\n<pre style=\"background-color: #e5e5e5; font-size: 15px;\"> <strong><span style=\"color: #008080;\"><span style=\"color: #000000;\">qchisq(p= <span style=\"color: #008000;\">.95<\/span> , df= <span style=\"color: #008000;\">13<\/span> )\n\n[1] 22.36203\n<\/span><\/span><\/strong><\/pre>\n<p><span style=\"color: #000000;\">\u4e34\u754c\u503c\u4e3a<strong>22.36203<\/strong> \u3002<\/span><\/p>\n<p><span style=\"color: #000000;\">\u6211\u4eec\u8fd8\u53ef\u4ee5\u4f7f\u7528<a href=\"https:\/\/statorials.org\/cn\/\u5361\u65b9\u4e34\u754c\u503c\u8ba1\u7b97\u5668\/\" target=\"_blank\" rel=\"noopener\">\u5361\u65b9\u4e34\u754c\u503c\u8ba1\u7b97\u5668<\/a>\u786e\u8ba4\u8fd9\u662f\u6b63\u786e\u7684\u3002<\/span><\/p>\n<h2> <strong><span style=\"color: #000000;\">rchisq<\/span><\/strong><\/h2>\n<p><span style=\"color: #000000;\">\u6211\u4eec\u7ecf\u5e38\u4f7f\u7528<strong>rchisq()<\/strong> <b>&nbsp;<\/b>\u51fd\u6570\u751f\u6210\u4e00\u4e2a\u5305\u542b<em>n \u4e2a<\/em>\u968f\u673a\u503c\u7684\u5217\u8868\uff0c\u8fd9\u4e9b\u503c\u9075\u5faa\u7ed9\u5b9a\u81ea\u7531\u5ea6\u7684\u5361\u65b9\u5206\u5e03\u3002<\/span><\/p>\n<p><span style=\"color: #000000;\">\u4f8b\u5982\uff0c\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u4ee3\u7801\u751f\u6210\u4e00\u4e2a\u5305\u542b 1,000 \u4e2a\u968f\u673a\u503c\u7684\u5217\u8868\uff0c\u8fd9\u4e9b\u503c\u9075\u5faa\u5177\u6709 5 \u4e2a\u81ea\u7531\u5ea6\u7684\u5361\u65b9\u5206\u5e03\uff1a<\/span><\/p>\n<pre style=\"background-color: #e5e5e5; font-size: 15px;\"> <strong><span style=\"color: #008080;\"><span style=\"color: #000000;\"><span style=\"color: #008080;\">#make this example reproducible<\/span>\nset. <span style=\"color: #3366ff;\">seed<\/span> ( <span style=\"color: #008000;\">0<\/span> ) \n\n<span style=\"color: #008080;\">#generate 1000 random values that follow Chi-Square dist with df=5\n<\/span>values &lt;- rchisq(n= <span style=\"color: #008000;\">1000<\/span> , df= <span style=\"color: #008000;\">5<\/span> )\n\n<span style=\"color: #008080;\">#view first five values<\/span>\nhead(values)\n\n[1] 8.369701 3.130487 1.985623 5.258747 10.578594 6.360859\n<\/span><\/span><\/strong><\/pre>\n<p><span style=\"color: #000000;\"><span style=\"color: #000000;\">\u6211\u4eec\u8fd8\u53ef\u4ee5\u4f7f\u7528<strong>hist(<\/strong> ) \u51fd\u6570\u751f\u6210\u76f4\u65b9\u56fe\uff0c\u4ee5\u4fbf\u53ef\u89c6\u5316\u503c\u7684\u5206\u5e03\uff1a<\/span><\/span> <\/p>\n<pre style=\"background-color: #e5e5e5; font-size: 15px;\"> <strong><span style=\"color: #008080;\"><span style=\"color: #000000;\"><span style=\"color: #008080;\">#create histogram to visualize distribution of values\n<\/span>hist(values)\n<\/span><\/span><\/strong><\/pre>\n<p><img decoding=\"async\" loading=\"lazy\" class=\" wp-image-25701 aligncenter\" src=\"https:\/\/statorials.org\/wp-content\/uploads\/2023\/08\/chisq2.jpg\" alt=\"\" width=\"429\" height=\"429\" srcset=\"\" sizes=\"auto, \"><\/p>\n<p> <span style=\"color: #000000;\">x \u8f74\u663e\u793a\u6570\u636e\u503c\uff0cy \u8f74\u663e\u793a\u8fd9\u4e9b\u503c\u7684\u9891\u7387\u3002<\/span><\/p>\n<h3><strong><span style=\"color: #000000;\">\u5176\u4ed6\u8d44\u6e90<\/span><\/strong><\/h3>\n<p><span style=\"color: #000000;\">\u4ee5\u4e0b\u6559\u7a0b\u89e3\u91ca\u4e86\u5982\u4f55\u5728 R \u4e2d\u4f7f\u7528\u5176\u4ed6\u53d1\u884c\u7248\uff1a<\/span><\/p>\n<p> <a href=\"https:\/\/statorials.org\/cn\/r-\u4e2d\u7684-dnorm-pnorm-rnorm-qnorm\/\" target=\"_blank\" rel=\"noopener\">R \u4e2d\u7684\u6b63\u6001\u5206\u5e03\uff1adnorm\u3001pnorm\u3001qnorm \u548c rnorm<\/a><br \/> <a href=\"https:\/\/statorials.org\/cn\/r-\u4e2d\u7684-dbinom-pbinom-qbinom-rbinom\/\" target=\"_blank\" rel=\"noopener\">R \u4e2d\u7684\u4e8c\u9879\u5206\u5e03\uff1adbinom\u3001pbinom\u3001qbinom \u548c rbinom<\/a><br \/> <a href=\"https:\/\/statorials.org\/cn\/ppois-ppois-qpois-rpois-r\/\" target=\"_blank\" rel=\"noopener\">R\u4e2d\u7684\u9c7c\u5206\u5e03\uff1adpois\u3001ppois\u3001qpois\u548crpois<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u672c\u6559\u7a0b\u4ecb\u7ecd\u5982\u4f55\u4f7f\u7528\u4ee5\u4e0b\u51fd\u6570\u5728 R \u4e2d\u4f7f\u7528\u5361\u65b9\u5206\u5e03\uff1a dchisq \uff1a\u8fd4\u56de\u5361\u65b9\u6982\u7387\u5bc6\u5ea6\u51fd\u6570\u7684\u503c\u3002 pchisq  [&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-2967","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\u5361\u65b9\u7684\u5206\u5e03\uff1adchisq\u3001pchisq\u3001qchisq\u3001rchisq - Statorials<\/title>\n<meta name=\"description\" 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