{"id":1566,"date":"2023-07-25T20:51:35","date_gmt":"2023-07-25T20:51:35","guid":{"rendered":"https:\/\/statorials.org\/cn\/r-%e7%9a%84%e7%bb%84%e6%96%b9%e5%b7%ae\/"},"modified":"2023-07-25T20:51:35","modified_gmt":"2023-07-25T20:51:35","slug":"r-%e7%9a%84%e7%bb%84%e6%96%b9%e5%b7%ae","status":"publish","type":"post","link":"https:\/\/statorials.org\/cn\/r-%e7%9a%84%e7%bb%84%e6%96%b9%e5%b7%ae\/","title":{"rendered":"\u5982\u4f55\u8ba1\u7b97 r \u4e2d\u7684\u5408\u5e76\u65b9\u5dee"},"content":{"rendered":"<p><\/p>\n<hr>\n<p><span style=\"color: #000000;\">\u5728\u7edf\u8ba1\u5b66\u4e2d\uff0c<a href=\"https:\/\/statorials.org\/cn\/\u7ec4\u65b9\u5dee\/\" target=\"_blank\" rel=\"noopener\">\u805a\u7c7b\u65b9\u5dee<\/a>\u662f\u6307\u4e24\u4e2a\u6216\u591a\u4e2a\u805a\u7c7b\u65b9\u5dee\u7684\u5e73\u5747\u503c\u3002<\/span><\/p>\n<p><span style=\"color: #000000;\">\u6211\u4eec\u4f7f\u7528\u201c\u5408\u5e76\u201d\u4e00\u8bcd\u6765\u8868\u793a\u6211\u4eec\u6b63\u5728\u201c\u5408\u5e76\u201d\u4e24\u4e2a\u6216\u591a\u4e2a\u7ec4\u65b9\u5dee\uff0c\u4ee5\u83b7\u5f97\u7ec4\u4e4b\u95f4\u5171\u540c\u65b9\u5dee\u7684\u5355\u4e2a\u6570\u5b57\u3002<\/span><\/p>\n<p><span style=\"color: #000000;\">\u5728\u5b9e\u8df5\u4e2d\uff0c\u5408\u5e76\u65b9\u5dee\u6700\u5e38\u7528\u4e8e<a href=\"https:\/\/statorials.org\/cn\/\u6d4b\u8bd5\u4f60\u7684\u4e24\u4e2a\u6837\u672c\/\" target=\"_blank\" rel=\"noopener\">\u53cc\u6837\u672c t \u68c0\u9a8c<\/a>\uff0c\u7528\u4e8e\u786e\u5b9a\u4e24\u4e2a\u603b\u4f53\u7684\u5747\u503c\u662f\u5426\u76f8\u7b49\u3002<\/span><\/p>\n<p><span style=\"color: #000000;\">\u4e24\u4e2a\u6837\u672c\u4e4b\u95f4\u7684\u5408\u5e76\u65b9\u5dee\u901a\u5e38\u8868\u793a\u4e3a<sub>sp<\/sub> <sup>2<\/sup> \uff0c\u8ba1\u7b97\u516c\u5f0f\u5982\u4e0b\uff1a<\/span><\/p>\n<p> <span style=\"color: #000000;\"><sub>sp<\/sub> <sup>2<\/sup> = ( (n <sub>1<\/sub> -1)s <sub>1<\/sub> <sup>2<\/sup> + (n <sub>2<\/sub> -1)s <sub>2<\/sub> <sup>2<\/sup> ) \/ (n <sub>1<\/sub> +n <sub>2<\/sub> -2)<\/span><\/p>\n<p><span style=\"color: #000000;\">\u4e0d\u5e78\u7684\u662f\uff0cR \u4e2d\u6ca1\u6709\u5185\u7f6e\u51fd\u6570\u6765\u8ba1\u7b97\u4e24\u7ec4\u4e4b\u95f4\u7684\u5408\u5e76\u65b9\u5dee\uff0c\u4f46\u6211\u4eec\u53ef\u4ee5\u5f88\u5bb9\u6613\u5730\u8ba1\u7b97\u5b83\u3002<\/span><\/p>\n<p><span style=\"color: #000000;\">\u4f8b\u5982\uff0c\u5047\u8bbe\u6211\u4eec\u8981\u8ba1\u7b97\u4ee5\u4e0b\u4e24\u7ec4\u4e4b\u95f4\u7684\u5408\u5e76\u65b9\u5dee\uff1a<\/span> <\/p>\n<p><img decoding=\"async\" loading=\"lazy\" class=\" wp-image-15524 aligncenter\" src=\"https:\/\/statorials.org\/wp-content\/uploads\/2023\/08\/pooledvar1.png\" alt=\"\" width=\"152\" height=\"350\" srcset=\"\" sizes=\"auto, \"><\/p>\n<p><span style=\"color: #000000;\">\u4ee5\u4e0b\u4ee3\u7801\u663e\u793a\u4e86\u5982\u4f55\u5728 R \u4e2d\u8ba1\u7b97\u8fd9\u4e9b\u7ec4\u4e4b\u95f4\u7684\u5408\u5e76\u65b9\u5dee\uff1a<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #008080;\">#define groups of data<\/span>\nx1 &lt;- c(6, 7, 7, 8, 10, 11, 13, 14, 14, 16, 18, 19, 19, 19, 20)\nx2 &lt;- c(5, 7, 7, 8, 10, 13, 14, 15, 19, 20, 20, 23, 25, 28, 32)\n\n<span style=\"color: #008080;\">#calculate sample size of each group\n<\/span>n1 &lt;- length(x1)\nn2 &lt;- length(x2)\n\n<span style=\"color: #008080;\">#calculate sample variance of each group\n<\/span>var1 &lt;- var(x1)\nvar2 &lt;- var(x2)\n\n<span style=\"color: #008080;\">#calculate pooled variance between the two groups\n<\/span>pooled &lt;- ((n1-1)*var1 + (n2-1)*var2) \/ (n1+n2-2)\n\n<span style=\"color: #008080;\">#display pooled variance\n<\/span>pooled\n\n[1] 46.97143\n<\/strong><\/pre>\n<p><span style=\"color: #000000;\">\u8fd9\u4e24\u7ec4\u4e4b\u95f4\u7684\u6c47\u603b\u65b9\u5dee\u4e3a<strong>46.97143<\/strong> \u3002<\/span><\/p>\n<h3><span style=\"color: #000000;\"><strong>\u5176\u4ed6\u8d44\u6e90<\/strong><\/span><\/h3>\n<p><a href=\"https:\/\/statorials.org\/cn\/\u7ec4\u65b9\u5dee\/\" target=\"_blank\" rel=\"noopener\">\u4ec0\u4e48\u662f\u805a\u7c7b\u65b9\u5dee\uff1f \uff08\u5b9a\u4e49\u548c\u4f8b\u5b50\uff09<\/a><br \/><a href=\"https:\/\/statorials.org\/cn\/\u7ec4\u65b9\u5dee\u8ba1\u7b97\u5668\/\" target=\"_blank\" rel=\"noopener\">\u6346\u7ed1\u95f4\u9699\u8ba1\u7b97\u5668<\/a><br \/><a href=\"https:\/\/statorials.org\/cn\/excel-\u7ec4\u65b9\u5dee\/\" target=\"_blank\" rel=\"noopener\">\u5982\u4f55\u5728 Excel \u4e2d\u8ba1\u7b97\u6c47\u603b\u65b9\u5dee<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5728\u7edf\u8ba1\u5b66\u4e2d\uff0c\u805a\u7c7b\u65b9\u5dee\u662f\u6307\u4e24\u4e2a\u6216\u591a\u4e2a\u805a\u7c7b\u65b9\u5dee\u7684\u5e73\u5747\u503c\u3002 \u6211\u4eec\u4f7f\u7528\u201c\u5408\u5e76\u201d\u4e00\u8bcd\u6765\u8868\u793a\u6211\u4eec\u6b63\u5728\u201c\u5408\u5e76\u201d\u4e24\u4e2a\u6216\u591a\u4e2a\u7ec4\u65b9 [&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-1566","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\u8ba1\u7b97 R \u4e2d\u7684\u805a\u7c7b\u65b9\u5dee - Statorials<\/title>\n<meta name=\"description\" content=\"\u672c\u6559\u7a0b\u901a\u8fc7\u4e00\u4e2a\u793a\u4f8b\u89e3\u91ca\u4e86\u5982\u4f55\u8ba1\u7b97 R \u4e2d\u4e24\u4e2a\u7ec4\u4e4b\u95f4\u7684\u5408\u5e76\u65b9\u5dee\u3002\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, 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