{"id":24818,"date":"2024-01-17T10:14:40","date_gmt":"2024-01-17T02:14:40","guid":{"rendered":"http:\/\/www.biocloudservice.com\/wordpress\/?p=24818"},"modified":"2024-01-17T10:14:42","modified_gmt":"2024-01-17T02:14:42","slug":"%e4%b8%80%e5%88%86%e9%92%9f%e5%b8%a6%e4%bd%a0%e4%ba%86%e8%a7%a3r%e8%af%ad%e8%a8%80%e5%8c%85leaps%ef%bc%8c%e5%b8%a6%e4%bd%a0%e5%bf%ab%e9%80%9f%e9%a2%84%e6%b5%8b%e5%8f%98%e9%87%8f%e5%ad%90%e9%9b%86","status":"publish","type":"post","link":"http:\/\/www.biocloudservice.com\/wordpress\/?p=24818","title":{"rendered":"\u4e00\u5206\u949f\u5e26\u4f60\u4e86\u89e3R\u8bed\u8a00\u5305leaps\uff0c\u5e26\u4f60\u5feb\u901f\u9884\u6d4b\u53d8\u91cf\u5b50\u96c6"},"content":{"rendered":"

R\u5305”leaps”\u662f\u4e00\u4e2a\u7528\u4e8e\u5b50\u96c6\u9009\u62e9\uff08subset selection\uff09\u7684R\u8bed\u8a00\u8f6f\u4ef6\u5305\u3002\u5b50\u96c6\u9009\u62e9\u662f\u6307\u4ece\u7ed9\u5b9a\u7684\u9884\u6d4b\u53d8\u91cf\u96c6\u5408\u4e2d\u9009\u62e9\u51fa\u6700\u4f73\u7684\u9884\u6d4b\u53d8\u91cf\u5b50\u96c6\uff0c\u4ee5\u5efa\u7acb\u4e00\u4e2a\u5177\u6709\u8f83\u597d\u9884\u6d4b\u80fd\u529b\u7684\u6a21\u578b\u3002”leaps”\u5305\u63d0\u4f9b\u4e86\u591a\u79cd\u7b97\u6cd5\u548c\u8bc4\u4f30\u6307\u6807\uff0c\u7528\u4e8e\u786e\u5b9a\u6700\u4f73\u7684\u9884\u6d4b\u53d8\u91cf\u5b50\u96c6\u3002<\/p>\n

\u4ee5\u4e0b\u662f\u4e00\u4e9b”leaps”\u5305\u7684\u4e3b\u8981\u529f\u80fd\uff1a<\/p>\n

1. \u6b63\u5411\u9009\u62e9\uff08forward selection\uff09\u548c\u9006\u5411\u9009\u62e9\uff08backward selection\uff09\uff1a”leaps”\u5305\u53ef\u4ee5\u4f7f\u7528\u6b63\u5411\u9009\u62e9\u7b97\u6cd5\u4ece\u7a7a\u6a21\u578b\u5f00\u59cb\u9010\u6b65\u6dfb\u52a0\u9884\u6d4b\u53d8\u91cf\uff0c\u6216\u8005\u4f7f\u7528\u9006\u5411\u9009\u62e9\u7b97\u6cd5\u4ece\u5305\u542b\u6240\u6709\u9884\u6d4b\u53d8\u91cf\u7684\u5b8c\u5168\u6a21\u578b\u5f00\u59cb\u9010\u6b65\u5254\u9664\u9884\u6d4b\u53d8\u91cf\u3002<\/p>\n

2. \u5168\u5b50\u96c6\u9009\u62e9\uff08best subset selection\uff09\uff1a”leaps”\u5305\u53ef\u4ee5\u901a\u8fc7\u7a77\u4e3e\u641c\u7d22\u7684\u65b9\u5f0f\u627e\u5230\u6700\u4f73\u7684\u9884\u6d4b\u53d8\u91cf\u5b50\u96c6\u3002\u5b83\u4f1a\u8003\u8651\u6240\u6709\u53ef\u80fd\u7684\u9884\u6d4b\u53d8\u91cf\u7ec4\u5408\uff0c\u5e76\u4f7f\u7528\u6307\u5b9a\u7684\u8bc4\u4f30\u6307\u6807\uff08\u4f8b\u5982AIC\u3001BIC\u7b49\uff09\u6765\u9009\u62e9\u6700\u4f73\u7684\u5b50\u96c6\u3002<\/p>\n

3. \u4ea4\u53c9\u9a8c\u8bc1\uff1a”leaps”\u5305\u652f\u6301\u4f7f\u7528\u4ea4\u53c9\u9a8c\u8bc1\u6765\u8bc4\u4f30\u4e0d\u540c\u9884\u6d4b\u53d8\u91cf\u5b50\u96c6\u7684\u6027\u80fd\u3002\u901a\u8fc7\u5c06\u6570\u636e\u96c6\u5212\u5206\u4e3a\u8bad\u7ec3\u96c6\u548c\u9a8c\u8bc1\u96c6\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ea4\u53c9\u9a8c\u8bc1\u6765\u4f30\u8ba1\u4e0d\u540c\u5b50\u96c6\u7684\u9884\u6d4b\u8bef\u5dee\uff0c\u5e76\u9009\u62e9\u5177\u6709\u6700\u5c0f\u8bef\u5dee\u7684\u5b50\u96c6\u3002<\/p>\n

4. \u53ef\u89c6\u5316\uff1a”leaps”\u5305\u63d0\u4f9b\u4e86\u53ef\u89c6\u5316\u5de5\u5177\uff0c\u5982\u5b50\u96c6\u5927\u5c0f\u4e0e\u8bc4\u4f30\u6307\u6807\u4e4b\u95f4\u7684\u56fe\u5f62\u5173\u7cfb\uff0c\u4ee5\u53ca\u6700\u4f73\u5b50\u96c6\u7684\u53d8\u91cf\u914d\u7f6e\u56fe\u3002<\/p>\n

\u8981\u4f7f\u7528leaps\u5305\uff0c\u53ef\u4ee5\u5728R\u4e2d\u4f7f\u7528\u4ee5\u4e0b\u547d\u4ee4\u8fdb\u884c\u5b89\u88c5\u548c\u52a0\u8f7d\uff1a<\/p>\n

>install.packages(“leaps”) # \u5b89\u88c5leaps\u5305<\/p>\n

>library(leaps) # \u52a0\u8f7dleaps\u5305<\/p>\n

\u793a\u4f8b\uff1a<\/p>\n

> library(leaps)<\/p>\n

> data <- data.frame(<\/p>\n

x1 = rnorm(100),<\/p>\n

x2 = rnorm(100),<\/p>\n

x3 = rnorm(100),<\/p>\n

y = rnorm(100)<\/p>\n

)<\/p>\n

> subset_model <- leaps(x = data[, -4], y = data$y)<\/p>\n

> print(subset_model)<\/p>\n

\"Screenshot<\/p>\n

> best_subset <- subset_model$which[which.min(subset_model$bic), ]<\/p>\n

> print(best_subset)<\/p>\n

1 2 3<\/p>\n

> model <- lm(y ~ ., data = data)<\/p>\n

> summary(model)<\/p>\n

\"Screenshot<\/p>\n

\u5728\u8fd9\u4e2a\u793a\u4f8b\u4e2d\uff0c\u6211\u4eec\u9996\u5148\u5b89\u88c5\u5e76\u52a0\u8f7d\u4e86”leaps”\u5305\u3002\u7136\u540e\uff0c\u6211\u4eec\u521b\u5efa\u4e86\u4e00\u4e2a\u5305\u542b\u56db\u4e2a\u53d8\u91cf\uff08x1\u3001x2\u3001x3\u548cy\uff09\u7684\u793a\u4f8b\u6570\u636e\u96c6\u3002\u63a5\u4e0b\u6765\uff0c\u6211\u4eec\u4f7f\u7528”leaps”\u51fd\u6570\u6267\u884c\u5168\u5b50\u96c6\u9009\u62e9\u7b97\u6cd5\uff0c\u7136\u540e\uff0c\u6211\u4eec\u6253\u5370\u4e86\u6700\u4f73\u5b50\u96c6\u9009\u62e9\u7684\u7ed3\u679c\uff0c\u5305\u62ec\u6bcf\u4e2a\u5b50\u96c6\u7684\u53d8\u91cf\u7ec4\u5408\u548c\u76f8\u5e94\u7684\u8bc4\u4f30\u6307\u6807\uff08\u5982AIC\u3001BIC\u7b49\uff09\u3002\u6211\u4eec\u9009\u62e9\u5177\u6709\u6700\u5c0fBIC\u503c\u7684\u5b50\u96c6\u4f5c\u4e3a\u6700\u4f73\u5b50\u96c6\u3002\u6700\u540e\uff0c\u6211\u4eec\u4f7f\u7528\u6700\u4f73\u5b50\u96c6\u62df\u5408\u4e86\u4e00\u4e2a\u7ebf\u6027\u56de\u5f52\u6a21\u578b\uff0c\u5e76\u6253\u5370\u4e86\u6a21\u578b\u6458\u8981\u3002<\/p>\n

\u4ee5\u4e0a\u5c31\u662f\u5bf9R\u8bed\u8a00\u5305leaps\u7684\u7b80\u5355\u4ecb\u7ecd\u5566\uff0c\u5176\u5b9e\u4f7f\u7528”leaps”\u5305\u53ef\u4ee5\u5e2e\u52a9\u7814\u7a76\u4eba\u5458\u548c\u6570\u636e\u79d1\u5b66\u5bb6\u4ece\u5927\u91cf\u7684\u9884\u6d4b\u53d8\u91cf\u4e2d\u9009\u62e9\u51fa\u6700\u5177\u9884\u6d4b\u80fd\u529b\u7684\u5b50\u96c6\uff0c\u4ee5\u5efa\u7acb\u66f4\u7b80\u6d01\u3001\u89e3\u91ca\u6027\u66f4\u597d\u7684\u6a21\u578b\u3002\u5b83\u5728\u7279\u5f81\u9009\u62e9\u3001\u53d8\u91cf\u7b5b\u9009\u548c\u6a21\u578b\u7b80\u5316\u7b49\u5e94\u7528\u4e2d\u975e\u5e38\u6709\u7528\u3002<\/p>\n

\u5c0f\u4f19\u4f34\u4eec\uff0c\u4eca\u5929\u6709\u6ca1\u6709\u5b66\u5230\u65b0\u77e5\u8bc6\u5462\uff0c\u60f3\u8981\u7ee7\u7eed\u4e86\u89e3R\u8bed\u8a00\u5185\u5bb9\u53ef\u4ee5\u6301\u7eed\u5173\u6ce8\u5c0f\u679c\u54e6\uff5e\uff5e\u6216\u8005\u4e5f\u53ef\u4ee5\u5173\u6ce8\u6211\u4eec\u7684\u5b98\u7f51\u4e5f\u4f1a\u6301\u7eed\u66f4\u65b0\u7684\u54e6\uff5e http:\/\/www.biocloudservice.com\/home.html<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

R\u5305”leaps”\u662f\u4e00\u4e2a\u7528\u4e8e\u5b50\u96c6\u9009\u62e9\uff08subset selection\uff09\u7684R\u8bed\u8a00\u8f6f\u4ef6\u5305 […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":""},"categories":[1],"tags":[],"jetpack_featured_media_url":"","_links":{"self":[{"href":"http:\/\/www.biocloudservice.com\/wordpress\/index.php?rest_route=\/wp\/v2\/posts\/24818"}],"collection":[{"href":"http:\/\/www.biocloudservice.com\/wordpress\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.biocloudservice.com\/wordpress\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.biocloudservice.com\/wordpress\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/www.biocloudservice.com\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=24818"}],"version-history":[{"count":1,"href":"http:\/\/www.biocloudservice.com\/wordpress\/index.php?rest_route=\/wp\/v2\/posts\/24818\/revisions"}],"predecessor-version":[{"id":24825,"href":"http:\/\/www.biocloudservice.com\/wordpress\/index.php?rest_route=\/wp\/v2\/posts\/24818\/revisions\/24825"}],"wp:attachment":[{"href":"http:\/\/www.biocloudservice.com\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=24818"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.biocloudservice.com\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=24818"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.biocloudservice.com\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=24818"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}