{"id":30373,"date":"2024-02-29T15:38:36","date_gmt":"2024-02-29T07:38:36","guid":{"rendered":"http:\/\/www.biocloudservice.com\/wordpress\/?p=30373"},"modified":"2024-02-29T15:38:38","modified_gmt":"2024-02-29T07:38:38","slug":"%e4%b8%80%e6%96%87%e6%90%9e%e5%ae%9a%ef%bc%81r%e8%af%ad%e8%a8%80%e5%ae%9e%e7%8e%b0%e6%95%b0%e6%8d%ae%e6%8c%96%e6%8e%98%e5%8d%81%e5%a4%a7%e7%ae%97%e6%b3%95%e4%b9%8bem%e7%ae%97%e6%b3%95","status":"publish","type":"post","link":"http:\/\/www.biocloudservice.com\/wordpress\/?p=30373","title":{"rendered":"\u4e00\u6587\u641e\u5b9a\uff01R\u8bed\u8a00\u5b9e\u73b0\u6570\u636e\u6316\u6398\u5341\u5927\u7b97\u6cd5\u4e4bEM\u7b97\u6cd5"},"content":{"rendered":"

\u4e00\u6587\u641e\u5b9a\uff01R\u8bed\u8a00\u5b9e\u73b0\u6570\u636e\u6316\u6398\u5341\u5927\u7b97\u6cd5\u4e4bEM\u7b97\u6cd5<\/strong><\/p>\n

\u4e86\u89e3\u6570\u636e\u6316\u6398\u7684\u5c0f\u4f19\u4f34\u5e94\u8be5\u77e5\u9053\uff0c\u6570\u636e\u6316\u6398\u9886\u57df\u6709\u5341\u5927\u7b97\u6cd5\uff0c\u5176\u4e2d\u6709\u4e00\u4e2a\u7b97\u6cd5\u662f\u4f60\u65e0\u6cd5\u7ed5\u5f00\u7684\u5165\u95e8\u5fc5\u5907\uff0c\u90a3\u5c31\u662fEM\u7b97\u6cd5\uff0c\u8fd9\u4e2a\u7b97\u6cd5\u770b\u4f3c\u7b80\u5355\u4f46\u53c8\u4e0d\u662f\u4e00\u770b\u5c31\u61c2\uff0c\u8ba9\u4eba\u53c8\u7231\u53c8\u6068\u3002\u4e8e\u662f\u4eca\u5929\u5c0f\u679c\u5c31\u4e89\u53d6\u7528\u4e00\u4e2a\u901a\u4fd7\u6613\u61c2\u7684\u6848\u4f8b\u6765\u8ba9\u5927\u5bb6\u5b66\u4f1a\u5b83\uff01<\/p>\n

\u5206\u6790\u4e4b\u524d\uff0c\u6211\u4eec\u5148\u6765\u4e86\u89e3\u4e00\u4e0b\uff0c\u4ec0\u4e48\u662fEM\u7b97\u6cd5\u5462\uff1fEM\u7b97\u6cd5\u5168\u79f0\u53eb\u505a\u6700\u5927\u671f\u671b\u7b97\u6cd5\uff08Expectation-maximization algorithm\uff0c\u53c8\u8bd1\u4e3a\u671f\u671b\u6700\u5927\u5316\u7b97\u6cd5\uff09\uff0c\u662f\u5728\u6982\u7387\u6a21\u578b\u4e2d\u5bfb\u627e\u53c2\u6570\u6700\u5927\u4f3c\u7136\u4f30\u8ba1\u6216\u8005\u6700\u5927\u540e\u9a8c\u4f30\u8ba1\u7684\u7b97\u6cd5\uff0c\u5176\u4e2d\u6982\u7387\u6a21\u578b\u4f9d\u8d56\u4e8e\u65e0\u6cd5\u89c2\u6d4b\u7684\u9690\u6027\u53d8\u91cf\u3002<\/p>\n

\u6700\u5927\u671f\u671b\u7b97\u6cd5\u7ecf\u8fc7\u4e24\u4e2a\u6b65\u9aa4\u4ea4\u66ff\u8fdb\u884c\u8ba1\u7b97\uff0c<\/p>\n

\u7b2c\u4e00\u6b65\u5c31\u662f\u8ba1\u7b97\u671f\u671b\u503c\uff08E\uff09\uff0c\u5229\u7528\u5bf9\u9690\u85cf\u53d8\u91cf\u7684\u73b0\u6709\u4f30\u8ba1\u503c\uff0c\u8ba1\u7b97\u5176\u6700\u5927\u4f3c\u7136\u4f30\u8ba1\u503c\uff1b<\/p>\n

\u7b2c\u4e8c\u6b65\u662f\u6700\u5927\u5316\uff08M\uff09\uff0c\u6700\u5927\u5316\u5728\u7b2c\u4e00\u6b65\u6c42\u5f97\u7684\u6700\u5927\u4f3c\u7136\u503c\u6765\u8ba1\u7b97\u53c2\u6570\u7684\u503c\u3002\u7b2c\u4e8c\u6b65\u4e0a\u627e\u6253\u7684\u53c2\u6570\u4f30\u8ba1\u503c\u88ab\u7528\u4e8e\u4e0b\u4e00\u6b21\u7b2c\u4e00\u6b65\u8ba1\u7b97\u4e2d\u3002\u8fd9\u4e2a\u8fc7\u7a0b\u4e0d\u65ad\u8fed\u4ee3\u8fdb\u884c\u53c2\u6570\u4f30\u8ba1\uff0c\u627e\u5230\u4e0e\u6570\u636e\u672c\u8eab\u6700\u5951\u5408\u7684\u6700\u4f18\u805a\u7c7b\u65b9\u5f0f\uff0c\u540c\u65f6\u7ed9\u51fa\u6700\u4f18\u7c7b\u522b\u6570\u3002<\/p>\n

\u7406\u8bba\u7ed3\u675f\uff0c\u5f00\u59cb\u4e0a\u5206\u6790\uff01<\/p>\n

\u5728R\u8bed\u8a00\u4e2d\u5b9e\u73b0\u671f\u671b\u6700\u5927\u5316\u805a\u7c7b\u7684\u662fmclust\u8f6f\u4ef6\u5305\u4e2d\u7684\u6838\u5fc3\u51fd\u6570mclust\uff08\uff09\u3002\u4e3a\u4e86\u80fd\u591f\u66f4\u52a0\u76f4\u89c2\u5730\u5c55\u793aEM\u7b97\u6cd5\u7684\u5206\u7c7b\u6548\u679c\uff0c\u5c0f\u679c\u8fd9\u6b21\u4f7f\u7528\u6211\u4eec\u7684\u8001\u670b\u53cb\u9e22\u5c3e\u82b1\u6570\u636e\u6765\u5c55\u5f00\u5206\u6790\u3002<\/p>\n

\u4ee3\u7801\u5c55\u793a<\/p>\n

library(mclust)<\/p>\n

#\u8fd0\u7528mclust\u5305\u5904\u7406\u9e22\u5c3e\u82b1\u6570\u636e\uff0c\u5e76\u81ea\u52a8\u63a8\u8350\u7c07\u6570<\/p>\n

irisEM<-Mclust(iris[,1:4]) #\u81ea\u52a8\u63a8\u8350\u7c07\u6570<\/p>\n

summary(irisEM)<\/p>\n

<\/p>\n

\u6ce8\uff1a\u6b64\u5904EM\u7b97\u6cd5\u63a8\u8350\u5206\u4e3a\u4e24\u7c07\uff0c\u4f46\u7531\u4e8e\u5df2\u77e5\u6570\u636e\u96c6\u7684\u6700\u4f73\u7c07\u6570\u4e3a3\uff0c\u6240\u4ee5\u6b64\u5904\u6211\u4eec\u91c7\u7528\u81ea\u5b9a\u4e49\u7c07\u6570\u3002<\/p>\n

#\u91cd\u65b0\u81ea\u5b9a\u4e49\u7c07\u6570<\/p>\n

irisEM<-Mclust(iris[,1:4],3)<\/p>\n

summary(irisEM)<\/p>\n

<\/p>\n

plot(irisEM,what=\u201dclassification\u201d,dimens=c(3,4)) #\u753b\u51fa\u5206\u7c7b\u7ed3\u679c<\/p>\n

<\/p>\n

#\u5f97\u5230\u6df7\u6dc6\u77e9\u9635<\/p>\n

table(iris$Species,irisEM$classification, c(“\u771f\u5b9e\u503c”,”\u9884\u6d4b\u503c”))<\/p>\n

<\/p>\n

#\u8f93\u51faEM\u805a\u7c7b\u8bc4\u4f30\u56fe\uff08\u5206\u7c7b\u56fe\u3001\u4e0d\u786e\u5b9a\u6027\u56fe\u548c\u5bc6\u5ea6\u56fe\uff09<\/p>\n

plot(irisEM)<\/p>\n

\"\u6563\u70b9\u56fe\n\n\u4e2d\u5ea6\u53ef\u4fe1\u5ea6\u63cf\u8ff0\u5df2\u81ea\u52a8\u751f\u6210\"<\/p>\n

<\/p>\n

<\/p>\n

\u7ed3\u679c\u5206\u6790\uff1a\u7531\u4e0a\u9762\u5206\u6790\u7ed3\u679c\u53ef\u4ee5\u770b\u51fa\uff0c\u57fa\u4e8eEM\u7b97\u6cd5\u81ea\u5b9a\u4e493\u4e2a\u7c07\u6570\uff0cMclust\u6a21\u578b\u53ef\u4ee5\u6709\u6548\u5730\u628asetosa\u548cvirginica\u533a\u5206\u5f00\u6765\uff0c\u4f46\u662fversicolor\u7c7b\u522b\u67095\u4e2a\u6837\u672c\u5206\u7c7b\u9519\u8bef\uff0c\u4f46\u603b\u4f53\u6765\u8bf4EM\u6837\u672c\u4ecd\u7136\u62e5\u6709\u8f83\u9ad8\u7684\u5206\u7c7b\u51c6\u786e\u7387\uff0c\u503c\u5f97\u88ab\u5c0f\u4f19\u4f34\u4eec\u7262\u7262\u638c\u63e1\uff01<\/p>\n

\u5206\u6790\u7ed3\u675f\u5566\uff01\u5c0f\u4f19\u4f34\u6709\u6ca1\u6709\u5b66\u4f1a\u5462\uff1f\u8fd8\u6709\u70b9\u8ff7\u7cca\u7684\u5c0f\u4f19\u4f34\u4e00\u5b9a\u8981\u52a8\u624b\u8bd5\u8bd5\u54e6\uff01\u6253\u597d\u57fa\u7840\u624d\u53ef\u4ee5\u5728\u77e5\u8bc6\u7684\u6d77\u6d0b\u8d8a\u6e38\u8d8a\u8fdc\u54e6\uff01\uff08\u63a8\u8350\u4e00\u4e0b\u5c0f\u679c\u65b0\u5f00\u53d1\u7684\u96f6\u4ee3\u7801\u4e91\u751f\u4fe1\u5206\u6790\u5de5\u5177\u5e73\u53f0\u5305\u542b\u8d85\u591a\u96f6\u4ee3\u7801\u5c0f\u5de5\u5177\uff0c\u4e0a\u4f20\u6570\u636e\u4e00\u952e\u51fa\u56fe\uff0c\u611f\u5174\u8da3\u7684\u5c0f\u4f19\u4f34\u6b22\u8fce\u6765\u53c2\u89c2\u54df\uff0c\u7f51\u5740\uff1ahttp:\/\/www.biocloudservice.com\/home.html\uff09<\/p>\n","protected":false},"excerpt":{"rendered":"

\u4e00\u6587\u641e\u5b9a\uff01R\u8bed\u8a00\u5b9e\u73b0\u6570\u636e\u6316\u6398\u5341\u5927\u7b97\u6cd5\u4e4bEM\u7b97\u6cd5 \u4e86\u89e3\u6570\u636e\u6316\u6398\u7684\u5c0f\u4f19\u4f34\u5e94\u8be5\u77e5\u9053\uff0c\u6570\u636e\u6316\u6398\u9886\u57df\u6709\u5341\u5927\u7b97\u6cd5\uff0c\u5176\u4e2d\u6709\u4e00 […]<\/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\/30373"}],"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=30373"}],"version-history":[{"count":1,"href":"http:\/\/www.biocloudservice.com\/wordpress\/index.php?rest_route=\/wp\/v2\/posts\/30373\/revisions"}],"predecessor-version":[{"id":30383,"href":"http:\/\/www.biocloudservice.com\/wordpress\/index.php?rest_route=\/wp\/v2\/posts\/30373\/revisions\/30383"}],"wp:attachment":[{"href":"http:\/\/www.biocloudservice.com\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=30373"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.biocloudservice.com\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=30373"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.biocloudservice.com\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=30373"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}