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flex-start;display: flex;flex-flow: row nowrap;\">\n<section style=\"display: inline-block;width: 403.391px;vertical-align: top;align-self: flex-start;flex: 0 0 auto;height: auto;\">\n<section style=\"margin-top: 10px;\">\n<section style=\"text-align: center;\">\n<section style=\"font-size: 16px;\">\n<section style=\"\" powered-by=\"xiumi.us\">\n<section style=\"text-align: left;justify-content: flex-start;display: flex;flex-flow: row nowrap;\">\n<section style=\"display: inline-block;vertical-align: top;width: 70.0348%;align-self: flex-start;flex: 0 0 auto;height: auto;max-width: 70.0348% !important;\">\n<section style=\"margin-top: 10px;\" powered-by=\"xiumi.us\">\n<section style=\"\" powered-by=\"xiumi.us\">\n<section style=\"text-align: center;\">\n<p style=\"text-indent: 0em;line-height: 1.75em;\"><span style=\"letter-spacing: 0.5px;\"><strong><span style=\"font-size: 15px;\">\u751f\u4fe1\u4ebaR\u8bed\u8a00\u5b66\u4e60\u5fc5\u5907<\/span><\/strong><\/span><\/p>\n<p style=\"text-indent: 0em;line-height: 1.75em;\"><span style=\"letter-spacing: 0.5px;\"><strong><span style=\"font-size: 15px;\">\u7acb\u523b\u62e5\u6709\u4e00\u4e2aRstudio\u8d26\u53f7<\/span><\/strong><\/span><\/p>\n<p style=\"text-indent: 0em;line-height: 1.75em;\"><span style=\"letter-spacing: 0.5px;\"><strong><span style=\"font-size: 15px;\">\u5f00\u542f\u5347\u7ea7\u6a21\u5f0f\u5427<\/span><\/strong><\/span><\/p>\n<p style=\"text-indent: 0em;line-height: 1.75em;\"><span style=\"color: rgb(255, 129, 36);font-size: 12px;letter-spacing: 0.5px;\">\uff0856\u7ebf\u7a0b\uff0c256G\u5185\u5b58\uff0c\u4e2a\u4eba\u5b58\u50a81T\uff09<\/span><\/p>\n<\/section>\n<\/section>\n<\/section>\n<\/section>\n<section style=\"display: inline-block;vertical-align: top;width: 29.9652%;align-self: flex-start;flex: 0 0 auto;height: auto;max-width: 29.9652% !important;\">\n<section style=\"margin-top: 10px;margin-bottom: 10px;\" powered-by=\"xiumi.us\">\n<section style=\"text-align: center;line-height: 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\/><\/section>\n<\/section>\n<\/section>\n<\/section>\n<\/section>\n<\/section>\n<\/section>\n<\/section>\n<\/section>\n<\/section>\n<\/section>\n<\/section>\n<\/section>\n<\/section>\n<\/section>\n<\/section>\n<\/section>\n<\/section>\n<\/section>\n<\/section>\n<\/section>\n<\/section>\n<section data-role=\"list\">\n<section>\n<section powered-by=\"xiumi.us\" style=\"margin-top: 10px;margin-bottom: 8px;text-align: left;justify-content: flex-start;display: flex;flex-flow: row nowrap;\">\n<section style=\"padding-left: 8px;display: inline-block;width: 578px;vertical-align: top;border-left: 3px solid rgb(219, 219, 219);border-bottom-left-radius: 0px;align-self: flex-start;flex: 0 0 auto;\">\n<section powered-by=\"xiumi.us\" style=\"color: rgba(0, 0, 0, 0.5);text-align: justify;\">\n<p><span style=\"letter-spacing: 0.578px;\"><span style=\"font-size: 14px;letter-spacing: 0.578px;\"><span style=\"letter-spacing: 0.578px;\"><span style=\"letter-spacing: 0.578px;font-size: 14px;\">PCA\u5206\u6790\u662f\u964d\u7eac\u5206<\/span><span style=\"letter-spacing: 0.578px;font-size: 14px;\">\u6790\u4e2d\u5e38\u7528\u7684\u624b\u6bb5\uff0c\u5f80\u5f80\u5927\u91cf\u7684\u6570\u636e\u96c6\u4e0d\u80fd\u76f4\u89c2\u7684\u4f53\u73b0\u51fa\u95ee\u9898\uff0c\u56e0\u6b64\u6211\u4eec\u9700\u8981\u5bf9\u6570\u636e\u8fdb\u884c\u964d\u7ef4\u5904\u7406\uff0c\u5206\u6790\u8d77\u5230\u4e3b\u8981\u4f5c\u7528\u7684\u6307\u6570PCA1\u3001PCA2\u3001PCA3……\uff0c\u56e0\u6b64\u79f0\u4e3a\u4e3b\u6210\u5206\u5206\u6790\u3002<\/span><\/span><\/span><\/span><\/p>\n<\/section>\n<\/section>\n<\/section>\n<section powered-by=\"xiumi.us\">\n<section>\n<section powered-by=\"xiumi.us\">\n<section>\n<section powered-by=\"xiumi.us\">\n<section>\n<section powered-by=\"xiumi.us\">\n<p><br \/><\/p>\n<section style=\"font-size: 16px;\">\n<section powered-by=\"xiumi.us\">\n<p style=\"white-space: normal;\"><span style=\"font-size: 14px;\">\u4f7f\u7528PCA\u5206\u6790\u7684\u8fc7\u7a0b\u4e2d\u6211\u4eec\u9700\u8981\u4e86\u89e3\u5176\u4e2d\u7684\u539f\u7406\uff0c\u624d\u80fd\u66f4\u597d\u7684\u7406\u89e3\u751f\u7269\u5b66\u610f\u4e49\uff0c\u73b0\u5728\u7684R\u5305\u4ee5\u53ca\u4e00\u4e9b\u8f6f\u4ef6\u90fd\u80fd\u505a\u5230\u4e00\u952e\u5206\u6790\u7684\u7a0b\u5ea6\uff0c\u4f46\u662f\u6211\u4eec\u4e5f\u8981\u4e86\u89e3\u80cc\u540e\u7684\u539f\u7406\u3002\u672c\u6587\u63d0\u4f9b\u4e24\u79cd\u505a\u51faPCA\u7684\u65b9\u6cd5\uff0c\u4e00\u79cd\u662f\u7406\u89e3\u539f\u7406\u5f0f\u8fdb\u884c\u4e00\u6b65\u6b65\u5206\u6790\uff0c\u4e00\u79cd\u4e3a\u6253\u5305\u597d\u7684prcomp()\u51fd\u6570\u3001princomp()\u51fd\u6570\u6765\u5206\u6790\u3002<\/span><\/p>\n<p style=\"text-align: center;\"><br \/><\/p>\n<p style=\"white-space: normal;\"><span style=\"font-size: 14px;\"><br \/><\/span><\/p>\n<p style=\"text-align: center;white-space: normal;\"><strong><em><span style=\"font-size: 20px;\">\u4e00\u6b65\u6b65\u505a\u51faPCA\u56fe<\/span><\/em><\/strong><\/p>\n<p style=\"text-align: left;white-space: normal;\"><strong><em>1\u3001\u6570\u636e\u6807\u51c6\u5316<\/em><\/strong><\/p>\n<p style=\"white-space: normal;\"><span style=\"font-size: 14px;\">\u4e3a\u4e86\u7edf\u4e00\u6570\u636e\u7684\u91cf\u7eb2\u5e76\u5bf9\u6570\u636e\u8fdb\u884c\u4e2d\u5fc3\u5316\uff0c\u5728\u4e3b\u6210\u5206\u5206\u6790\u4e4b\u95f4\u9700\u8981\u5bf9\u6570\u636e\u8fdb\u884c\u6807\u51c6\u5316\u3002<\/span><\/p>\n<\/section>\n<section class=\"code-snippet__fix code-snippet__js\">\n<ul class=\"code-snippet__line-index code-snippet__js\">\n<li><\/li>\n<li><\/li>\n<li><\/li>\n<li><\/li>\n<li><\/li>\n<\/ul>\n<pre class=\"code-snippet__js\" data-lang=\"c\"><code><span class=\"code-snippet_outer\">#\u4f7f\u7528R\u4e2d\u81ea\u5e26\u7684\u9e22\u5c3e\u82b1\u4f5c\u4e3a\u6570\u636e\u8fdb\u884c\u5b9e\u8df5<\/span><\/code><code><span class=\"code-snippet_outer\">data<-<span class=\"code-snippet__function\">iris<\/span><\/span><\/code><code><span class=\"code-snippet_outer\"><span class=\"code-snippet__title\">head<\/span><span class=\"code-snippet__params\">(data)<\/span><\/span><\/code><code><span class=\"code-snippet_outer\">#\u7528\u51fd\u6570scale\uff08\uff09\u8fdb\u884c\u5f52\u4e00\u5316\u7684\u5904\u7406<\/span><\/code><code><span class=\"code-snippet_outer\">dt<-as.<span class=\"code-snippet__title\">matrix<\/span><span class=\"code-snippet__params\">(scale(data[,<span class=\"code-snippet__number\">1<\/span>:<span class=\"code-snippet__number\">4<\/span>]))<\/span><\/span><\/code><\/pre>\n<\/section>\n<section powered-by=\"xiumi.us\">\n<p style=\"white-space: normal;\"><br \/><\/p>\n<p style=\"text-align: left;white-space: normal;font-size: 16px;margin-bottom: 0px;letter-spacing: 0.578px;\"><strong><em>2\u3001\u8ba1\u7b97\u76f8\u5173\u7cfb\u6570\u77e9\u9635<\/em><\/strong><\/p>\n<p style=\"white-space: normal;\"><span style=\"font-size: 14px;\">\u4e3b\u6210\u5206\u5373\u627e\u51fa\u89e3\u91ca\u53d8\u91cf\u65b9\u5dee\u6700\u5927\u7684\u4e3b\u6210\u5206\uff0c\u6240\u4ee5\u9700\u8981\u8ba1\u7b97\u53d8\u91cf\u4e4b\u95f4\u534f\u65b9\u5dee\u3002\u7528cor\uff08\uff09\u8fdb\u884c\u8ba1\u7b97\u76f8\u5173\u7cfb\u6570\u77e9\u9635<\/span><\/p>\n<\/section>\n<section class=\"code-snippet__fix code-snippet__js\">\n<ul class=\"code-snippet__line-index code-snippet__js\">\n<li><\/li>\n<li><\/li>\n<\/ul>\n<pre class=\"code-snippet__js\" data-lang=\"c\"><code><span class=\"code-snippet_outer\">data_cor<-cor(dt)<\/span><\/code><code><span class=\"code-snippet_outer\">data_cor<\/span><\/code><\/pre>\n<\/section>\n<section powered-by=\"xiumi.us\">\n<p style=\"white-space: normal;\"><br \/><\/p>\n<p style=\"text-align: left;white-space: normal;font-size: 16px;margin-bottom: 0px;letter-spacing: 0.578px;\"><strong><em>3\u3001\u7279\u5f81\u503c\u7279\u5f81\u5411\u91cf<\/em><\/strong><\/p>\n<\/section>\n<section class=\"code-snippet__fix code-snippet__js\">\n<ul class=\"code-snippet__line-index code-snippet__js\">\n<li><\/li>\n<li><\/li>\n<li><\/li>\n<li><\/li>\n<li><\/li>\n<\/ul>\n<pre class=\"code-snippet__js\" data-lang=\"c\"><code><span class=\"code-snippet_outer\">data_s<-eigen(data_cor)#\u8ba1\u7b97\u7279\u5f81\u503c\u7279\u5f81\u5411\u91cf<\/span><\/code><code><span class=\"code-snippet_outer\">data_s<\/span><\/code><code><span class=\"code-snippet_outer\">val <- data_s$values #\u63d0\u53d6\u4e3b\u6210\u5206\u90e8\u5206\uff08\u5373\u7279\u5f81\u5411\u91cf\uff09values<\/span><\/code><code><span class=\"code-snippet_outer\">standard_deviation <- <span class=\"code-snippet__built_in\">sqrt<\/span>(val) #\u6362\u7b97\u4e3a<span class=\"code-snippet__built_in\">sqrt<\/span>\uff08\uff09\u6807\u51c6\u5dee\u7684\u5f62\u5f0f<\/span><\/code><code><span class=\"code-snippet_outer\">pro_v <- val\/sum(val)#\u8ba1\u7b97\u8d21\u732e\u7387\uff0c\u4f5c\u4e3a\u540e\u8fb9\u7684X\u548cY\u8f74\u7684\u6807\u9898<\/span><\/code><\/pre>\n<\/section>\n<section powered-by=\"xiumi.us\">\n<p style=\"white-space: normal;\"><br \/><\/p>\n<p style=\"text-align: left;white-space: normal;font-size: 16px;margin-bottom: 0px;letter-spacing: 0.578px;\"><strong><em>4\u3001\u8ba1\u7b97\u4e3b\u6210\u5206\u5f97\u5206<\/em><\/strong><\/p>\n<\/section>\n<section class=\"code-snippet__fix code-snippet__js\">\n<ul class=\"code-snippet__line-index code-snippet__js\">\n<li><\/li>\n<li><\/li>\n<li><\/li>\n<li><\/li>\n<li><\/li>\n<li><\/li>\n<\/ul>\n<pre class=\"code-snippet__js\" data-lang=\"c\"><code><span class=\"code-snippet_outer\">#\u63d0\u53d6\u7ed3\u679c\u4e2d\u7684\u7279\u5f81\u5411\u91cf<\/span><\/code><code><span class=\"code-snippet_outer\">U<-as.matrix(data_s$vectors)<\/span><\/code><code><span class=\"code-snippet_outer\">#\u8fdb\u884c\u77e9\u9635\u4e58\u6cd5\uff0c\u83b7\u5f97\u4e3b\u6210\u5206\u5f97\u5206\uff1b<\/span><\/code><code><span class=\"code-snippet_outer\">pc <-dt %*% <span class=\"code-snippet__function\">U<\/span><\/span><\/code><code><span class=\"code-snippet_outer\"><span class=\"code-snippet__title\">colnames<\/span><span class=\"code-snippet__params\">(pc)<\/span> <- <span class=\"code-snippet__title\">c<\/span><span class=\"code-snippet__params\">(<span class=\"code-snippet__string\">\"PC1\"<\/span>,<span class=\"code-snippet__string\">\"PC2\"<\/span>,<span class=\"code-snippet__string\">\"PC3\"<\/span>,<span class=\"code-snippet__string\">\"PC4\"<\/span>)<\/span><\/span><\/code><code><span class=\"code-snippet_outer\"><span class=\"code-snippet__title\">head<\/span><span class=\"code-snippet__params\">(pc)<\/span><\/span><\/code><\/pre>\n<\/section>\n<section powered-by=\"xiumi.us\">\n<p style=\"white-space: normal;\"><br \/><\/p>\n<p style=\"text-align: left;white-space: normal;font-size: 16px;margin-bottom: 0px;letter-spacing: 0.578px;\"><strong><em>5\u3001\u7ed8\u5236\u56fe<\/em><\/strong><\/p>\n<\/section>\n<section class=\"code-snippet__fix code-snippet__js\">\n<ul class=\"code-snippet__line-index code-snippet__js\">\n<li><\/li>\n<li><\/li>\n<li><\/li>\n<li><\/li>\n<li><\/li>\n<li><\/li>\n<li><\/li>\n<li><\/li>\n<li><\/li>\n<li><\/li>\n<li><\/li>\n<li><\/li>\n<li><\/li>\n<li><\/li>\n<li><\/li>\n<\/ul>\n<pre class=\"code-snippet__js\" data-lang=\"c\"><code><span class=\"code-snippet_outer\">#\u5c06iris\u6570\u636e\u96c6\u7684\u7b2c<span class=\"code-snippet__number\">5<\/span>\u5217\u7269\u79cd\u6570\u636e\u52a0\u4e0a\u5408\u5e76\u8fdb\u6765\uff1b<\/span><\/code><code><span class=\"code-snippet_outer\">df<-data.frame(PC,iris$Species)<\/span><\/code><code><span class=\"code-snippet_outer\">head(df)<\/span><\/code><code><span class=\"code-snippet_outer\">#\u7528ggplot2\u7ed8\u5236\u56fe<\/span><\/code><code><span class=\"code-snippet_outer\">#\u8f7d\u5165ggplot2\u5305\uff1b<\/span><\/code><code><span class=\"code-snippet_outer\">library(ggplot2)<\/span><\/code><code><span class=\"code-snippet_outer\">#\u63d0\u53d6\u4e3b\u6210\u5206\u7684\u65b9\u5dee\u8d21\u732e\u7387\uff0c\u751f\u6210\u5750\u6807\u8f74\u6807\u9898\uff1b<\/span><\/code><code><span class=\"code-snippet_outer\">xlab<-paste0(<span class=\"code-snippet__string\">\"PC1(\"<\/span>,round(pro_v[<span class=\"code-snippet__number\">1<\/span>]*<span class=\"code-snippet__number\">100<\/span>,<span class=\"code-snippet__number\">2<\/span>),<span class=\"code-snippet__string\">\"%)\"<\/span>)#\u8bbe\u7f6ex\u8f74\u7684\u6807\u9898<\/span><\/code><code><span class=\"code-snippet_outer\">ylab<-paste0(<span class=\"code-snippet__string\">\"PC2(\"<\/span>,round(pro_v[<span class=\"code-snippet__number\">2<\/span>]*<span class=\"code-snippet__number\">100<\/span>,<span class=\"code-snippet__number\">2<\/span>),<span class=\"code-snippet__string\">\"%)\"<\/span>)#\u8bbe\u7f6ey\u8f74\u7684\u6807\u9898<\/span><\/code><code><span class=\"code-snippet_outer\">#\u7ed8\u5236\u6563\u70b9\u56fe\u5e76\u6dfb\u52a0\u7f6e\u4fe1\u692d\u5706\uff1b<\/span><\/code><code><span class=\"code-snippet_outer\">p1<-ggplot(data = df,aes(x=PC1,y=PC2,color=iris.Species))+<\/span><\/code><code><span class=\"code-snippet_outer\">stat_ellipse(aes(fill=iris.Species),<\/span><\/code><code><span class=\"code-snippet_outer\">type =<span class=\"code-snippet__string\">\"norm\"<\/span>, geom =<span class=\"code-snippet__string\">\"polygon\"<\/span>,alpha=<span class=\"code-snippet__number\">0.2<\/span>,color=NA)+<\/span><\/code><code><span class=\"code-snippet_outer\">geom_point()+<span class=\"code-snippet__built_in\">labs<\/span>(x=xlab,y=ylab,color=<span class=\"code-snippet__string\">\"\"<\/span>)+<\/span><\/code><code><span class=\"code-snippet_outer\">guides(fill=F)<\/span><\/code><\/pre>\n<\/section>\n<section powered-by=\"xiumi.us\">\n<p style=\"white-space: normal;\"><br \/><\/p>\n<p style=\"white-space: normal;\"><span style=\"font-size: 14px;\">p1<\/span><\/p>\n<p style=\"white-space: normal;\"><span style=\"font-size: 14px;\"> <\/span><\/p>\n<p style=\"text-align: center;\"><img decoding=\"async\" class=\"rich_pages wxw-img\" data-galleryid=\"\" data-ratio=\"0.776173285198556\" data-s=\"300,640\" src=\"https:\/\/i0.wp.com\/www.biocloudservice.com\/wordpress\/wp-content\/uploads\/2024\/06\/2_TsFJ8Saqiaz4VNPavYQPAQ6joXXBQA.png?w=640\" onerror=\"this.src='https:\/\/mmbiz.qpic.cn\/sz_mmbiz_png\/zcicibWZessAwIX3hF1ZZeqvXLknM5Oq7CfrYlwfoG4Gr7eic1otumyAX3icLTsFJ8Saqiaz4VNPavYQPAQ6joXXBQA\/640?wx_fmt=png'\" data-type=\"png\" data-w=\"554\" style=\"\" data-recalc-dims=\"1\" \/><\/p>\n<p style=\"text-align: center;white-space: normal;\"><strong><em><span style=\"font-size: 20px;\"><br \/><\/span><\/em><\/strong><\/p>\n<p style=\"text-align: center;white-space: normal;\"><strong><em><span style=\"font-size: 20px;\"><br \/><\/span><\/em><\/strong><\/p>\n<p style=\"text-align: center;white-space: normal;\"><strong><em><span style=\"font-size: 20px;\">\u4f7f\u7528\u73b0\u5728\u5c01\u88c5\u597d\u7684\u51fd\u6570\u8fdb\u884cPCA\u5206\u6790<\/span><\/em><\/strong><\/p>\n<p style=\"white-space: normal;\"><span style=\"font-size: 14px;\">prcomp()\u51fd\u6570\u3001princomp()\u51fd\u6570\u53ef\u4ee5\u5bf9\u4e0a\u8ff0\u6b65\u9aa4\u8fdb\u884c\u4e00\u6b21\u6027\u5206\u6790<\/span><\/p>\n<p style=\"white-space: normal;\"><span style=\"font-size: 14px;\">#\u4f7f\u7528prcomp()\u51fd\u6570\u8fdb\u884c\u76f4\u63a5PCA\u7684\u8ba1\u7b97<\/span><\/p>\n<p style=\"white-space: normal;\"><span style=\"font-size: 14px;\">com1 <- prcomp(data[,1:4], center = TRUE,scale. = TRUE)<\/span><\/p>\n<p style=\"white-space: normal;\"><span style=\"font-size: 14px;\">summary(com1)<\/span><\/p>\n<p style=\"white-space: normal;\"><span style=\"font-size: 14px;\"> <\/span><\/p>\n<p style=\"text-align: center;\"><img decoding=\"async\" class=\"rich_pages wxw-img\" data-galleryid=\"\" data-ratio=\"0.2545126353790614\" data-s=\"300,640\" src=\"https:\/\/i0.wp.com\/www.biocloudservice.com\/wordpress\/wp-content\/uploads\/2024\/06\/3_70ic9wckNKWLpduyVXSibBM9FFqVzA.png?w=640\" onerror=\"this.src='https:\/\/mmbiz.qpic.cn\/sz_mmbiz_png\/zcicibWZessAwIX3hF1ZZeqvXLknM5Oq7CazQVXyCwQTTRQBXNRk1bNvTkeD70ic9wckNKWLpduyVXSibBM9FFqVzA\/640?wx_fmt=png'\" data-type=\"png\" data-w=\"554\" style=\"\" data-recalc-dims=\"1\" \/><\/p>\n<p style=\"white-space: normal;\"><span style=\"font-size: 14px;\">\u540e\u7eed\u7684\u9700\u8981\u5408\u5e76\u9e22\u5c3e\u82b1\u5c5e\u7684\u5217\uff08\u57305\u5217\uff09\uff0c\u6700\u540e\u505a\u51fa\u5b9e\u73b0PCA\u53ef\u89c6\u5316\u5373\u53ef\u3002<\/span><\/p>\n<p style=\"white-space: normal;\"><span style=\"font-size: 14px;\"><br \/><\/span><\/p>\n<p style=\"white-space: normal;\"><span style=\"font-size: 14px;\"><br \/><\/span><\/p>\n<p style=\"text-align: center;white-space: normal;\"><strong><em><span style=\"font-size: 20px;\">PCA\u901a\u4fd7\u6613\u61c2\u7684\u7406\u89e3<\/span><\/em><\/strong><\/p>\n<p style=\"white-space: normal;\"><span style=\"font-size: 14px;\">Principal Component Analysis(PCA)\u4e3b\u6210\u5206\u5206\u6790\u5b83\u672c\u8d28\u662f\u628a\u6570\u636e\u89c6\u4e3a\u4e00\u4e2a\u591a\u7ef4\u5ea6\u7684\u5b58\u5728\uff0c\u4f46\u662f\u6bcf\u4e2a\u7eac\u5ea6\u5bf9\u6574\u4e2a\u6570\u636e\u96c6\u7684\u8d21\u732e\u5ea6\u662f\u4e0d\u4e00\u6837\u7684\uff0c\u4e3a\u4e86\u65b9\u4fbf\u89c2\u5bdf\uff0c\u6211\u4eec\u4f1a\u5bf9\u8d21\u732e\u7387\u4f4e\u7684\u7eac\u5ea6\u8fdb\u884c\u5ffd\u7565\uff0c\u4fdd\u75592\u7ef4\u6216\u80053\u7ef4\u7684\u5185\u5bb9\uff0c\u90a3\u7559\u4e0b\u7684\u4e09\u4e2a\u7eac\u5ea6\u90fd\u662f\u8d77\u5230\u91cd\u8981\u4f5c\u7528\u7684\uff0c\u56e0\u6b64\u79f0\u4e3a\u4e3b\u6210\u5206\uff0c\u4f46\u662f\u4ed6\u5bf9\u4e8e\u6574\u4e2a\u6570\u636e\u96c6\u7684\u8d21\u732e\u5e76\u4e0d\u662f1\uff0c\u6240\u4ee5\u6211\u4eec\u770b\u5230\u6a2a\u7eb5\u5750\u6807\u5e76\u4e0d\u662f1\uff0c\u800c\u662f<1\u7684\u6570\u3002<\/span><\/p>\n<p style=\"white-space: normal;\"><span style=\"font-size: 14px;\"> <\/span><\/p>\n<p style=\"white-space: normal;\"><span style=\"font-size: 14px;\">\u5982\u679c\u6211\u4eec\u5bf9\u4e8eR\u4ee3\u7801\u4e0d\u719f\u6089\u7684\uff0c\u73b0\u5728\u4e5f\u4f1a\u6709\u5f88\u591a\u7f51\u4e0a\u7684\u5c0f\u5de5\u5177\u4e00\u952e\u53ef\u4ee5\u51fa\u56fehttp:\/\/www.biocloudservice.com\/794\/794.php<\/span><\/p>\n<p style=\"white-space: normal;\"><span style=\"font-size: 14px;\"> <\/span><\/p>\n<p style=\"white-space: normal;\"><span style=\"font-size: 14px;\">\u603b\u800c\u8a00\u4e4b\uff0c\u6211\u4eec\u662f\u8981\u505a\u51fa\u56fe\u6765\u652f\u6491\u6211\u4eec\u7684\u8bba\u6587\u89c2\u70b9\uff0c\u4f46\u662f\u5bf9\u4e8e\u4e00\u4e9b\u7edf\u8ba1\u5b66\u7684\u77e5\u8bc6\u4e5f\u5e94\u8be5\u6709\u4e00\u5b9a\u7684\u4e86\u89e3\u548c\u638c\u63e1\uff0c\u624d\u80fd\u66f4\u597d\u7684\u5206\u6790\u6570\u636e\u3001\u7406\u89e3\u56fe\u7684\u542b\u4e49\u7b49\u3002<\/span><\/p>\n<p style=\"white-space: normal;\"><span style=\"font-size: 14px;\"><br \/><\/span><\/p>\n<p style=\"white-space: normal;\"><span style=\"font-size: 14px;\">\u4eca\u5929\u7684\u5206\u4eab\u5c31\u5230\u8fd9\u91cc\u4e86\uff0c\u5c0f\u4f19\u4f34\u4eec\u5982\u679c\u6709\u4ec0\u4e48\u95ee\u9898\u5c31\u548c\u5c0f\u679c\u8ba8\u8bba\u5427\u3002<\/span><\/p>\n<section style=\"margin-bottom: 0px;letter-spacing: 0.578px;white-space: normal;font-size: 16px;\">\n<section>\n<section powered-by=\"xiumi.us\">\n<p style=\"text-align: center;\"><br \/><\/p>\n<\/section>\n<\/section>\n<\/section>\n<section data-tools=\"135\u7f16\u8f91\u5668\" data-id=\"105054\" style=\"margin-bottom: 0px;letter-spacing: 0.578px;white-space: normal;font-size: 16px;\">\n<section style=\"margin: 10px auto;text-align: center;\">\n<section style=\"padding-top: 30px;padding-bottom: 30px;background-color: rgb(242, 246, 255);border-radius: 7px;\">\n<section style=\"display: flex;justify-content: space-evenly;align-items: center;\">\n<section data-width=\"26%\" style=\"width: 150.266px;\">\n<section style=\"padding: 7px;border-radius: 15px;box-shadow: rgba(169, 187, 223, 0.45) 4px 4px 8px, rgb(255, 255, 255) -2.5px -2.5px 5px;\">\n<section data-width=\"100%\" style=\"width: 136.266px;\"><img decoding=\"async\" class=\"rich_pages wxw-img\" data-cropselx1=\"0\" data-cropselx2=\"136\" data-cropsely1=\"0\" data-cropsely2=\"137\" data-ratio=\"1\" src=\"https:\/\/i0.wp.com\/www.biocloudservice.com\/wordpress\/wp-content\/uploads\/2024\/06\/4_jEYQoRbKh3HUg3IGgzymibpTnmaM6Q-2.jpg?w=640\" onerror=\"this.src='https:\/\/mmbiz.qpic.cn\/sz_mmbiz_jpg\/zcicibWZessAwIX3hF1ZZeqvXLknM5Oq7CDG9YFpmvU1ge12vc3NvibhViceQjEYQoRbKh3HUg3IGgzymibpTnmaM6Q\/640?wx_fmt=jpeg'\" data-type=\"png\" data-w=\"430\" data-width=\"100%\" style=\"height: 137px;vertical-align: inherit;width: 137px;display: block;border-radius: 7px;\" title=\"\u5c0f\u4e91-\u5fae\u4fe1\u4e8c\u7ef4\u7801.png\" data-recalc-dims=\"1\" \/><\/section>\n<\/section>\n<\/section>\n<section data-width=\"62%\" style=\"width: 358.359px;\">\n<section style=\"display: inline-block;\">\n<section style=\"padding: 7px 15px;border-radius: 20px;box-shadow: rgba(169, 187, 223, 0.45) 6px 6px 8px inset, rgb(255, 255, 255) -2.5px -2.5px 5px inset;\">\n<section data-brushtype=\"text\" style=\"font-size: 14px;letter-spacing: 1.5px;color: rgb(111, 133, 172);\">\n<p style=\"text-indent: 0em;line-height: 1.75em;\"><span style=\"letter-spacing: 0.5px;\"><span style=\"letter-spacing: 1.5px;\">\u626b\u7801\u52a0\u5c0f\u679c<\/span><\/span><\/p>\n<p style=\"text-indent: 0em;line-height: 1.75em;\"><span style=\"letter-spacing: 0.5px;\"><span style=\"letter-spacing: 1.5px;\">\u9886\u53d6\u751f\u4fe1\u5927\u793c\u5305<\/span><\/span><\/p>\n<\/section>\n<\/section>\n<\/section>\n<\/section>\n<\/section>\n<\/section>\n<\/section>\n<\/section>\n<section style=\"margin-bottom: 0px;letter-spacing: 0.578px;white-space: normal;caret-color: rgba(0, 0, 0, 0);font-size: 16px;\">\n<section>\n<section style=\"margin-top: 0.5em;\">\n<section style=\"padding: 0.5em;border-width: 1px;border-style: solid;box-shadow: rgb(226, 226, 226) 0px 16px 1px -13px;border-color: rgb(0, 150, 136);\">\n<section style=\"text-align: left;\">\n<section style=\"color: rgb(255, 129, 36);text-align: justify;\">\n<section style=\"margin-bottom: 8px;\">\n<p style=\"text-indent: 0em;line-height: 1.75em;\"><span style=\"letter-spacing: 0.5px;\">\u70b9\u51fb<strong><span style=\"color: rgb(0, 150, 136);\">\u201c\u9605\u8bfb\u539f\u6587\u201d<\/span><\/strong>\u7acb\u523b\u62e5\u6709<\/span><\/p>\n<\/section>\n<\/section>\n<\/section>\n<\/section>\n<\/section>\n<section style=\"margin-bottom: 8px;font-size: 32px;color: rgb(0, 150, 136);\">\n<p style=\"text-indent: 0em;line-height: 1.75em;\"><span style=\"letter-spacing: 0.5px;\">\u2193\u2193\u2193 <\/span><\/p>\n<\/section>\n<\/section>\n<\/section>\n<p style=\"white-space: normal;\"><span style=\"font-size: 14px;\"><br 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\/><\/section>\n<\/section>\n<\/section>\n<\/section>\n<\/section>\n<\/section>\n<\/section>\n<\/section>\n<\/section>\n<\/section>\n<\/section>\n<\/section>\n<\/section>\n<\/section>\n<\/section>\n<\/section>\n<\/section>\n<\/section>\n<\/section>\n<\/section>\n<\/section>\n<\/section>\n<section data-role=\"list\">\n<section>\n<section powered-by=\"xiumi.us\" style=\"margin-top: 10px;margin-bottom: 8px;text-align: left;justify-content: flex-start;display: flex;flex-flow: row nowrap;\">\n<section style=\"padding-left: 8px;display: inline-block;width: 578px;vertical-align: top;border-left: 3px solid rgb(219, 219, 219);border-bottom-left-radius: 0px;align-self: flex-start;flex: 0 0 auto;\">\n<section powered-by=\"xiumi.us\" style=\"color: rgba(0, 0, 0, 0.5);text-align: justify;\">\n<p><span style=\"letter-spacing: 0.578px;\"><span style=\"font-size: 14px;letter-spacing: 0.578px;\"><span style=\"letter-spacing: 0.578px;\"><span style=\"letter-spacing: 0.578px;font-size: 14px;\">PCA\u5206\u6790\u662f\u964d\u7eac\u5206<\/span><span style=\"letter-spacing: 0.578px;font-size: 14px;\">\u6790\u4e2d\u5e38\u7528\u7684\u624b\u6bb5\uff0c\u5f80\u5f80\u5927\u91cf\u7684\u6570\u636e\u96c6\u4e0d\u80fd\u76f4\u89c2\u7684\u4f53\u73b0\u51fa\u95ee\u9898\uff0c\u56e0\u6b64\u6211\u4eec\u9700\u8981\u5bf9\u6570\u636e\u8fdb\u884c\u964d\u7ef4\u5904\u7406\uff0c\u5206\u6790\u8d77\u5230\u4e3b\u8981\u4f5c\u7528\u7684\u6307\u6570PCA1\u3001PCA2\u3001PCA3……\uff0c\u56e0\u6b64\u79f0\u4e3a\u4e3b\u6210\u5206\u5206\u6790\u3002<\/span><\/span><\/span><\/span><\/p>\n<\/section>\n<\/section>\n<\/section>\n<section powered-by=\"xiumi.us\">\n<section>\n<section powered-by=\"xiumi.us\">\n<section>\n<section powered-by=\"xiumi.us\">\n<section>\n<section powered-by=\"xiumi.us\">\n<p><br \/><\/p>\n<section style=\"font-size: 16px;\">\n<section powered-by=\"xiumi.us\">\n<p style=\"white-space: normal;\"><span style=\"font-size: 14px;\">\u4f7f\u7528PCA\u5206\u6790\u7684\u8fc7\u7a0b\u4e2d\u6211\u4eec\u9700\u8981\u4e86\u89e3\u5176\u4e2d\u7684\u539f\u7406\uff0c\u624d\u80fd\u66f4\u597d\u7684\u7406\u89e3\u751f\u7269\u5b66\u610f\u4e49\uff0c\u73b0\u5728\u7684R\u5305\u4ee5\u53ca\u4e00\u4e9b\u8f6f\u4ef6\u90fd\u80fd\u505a\u5230\u4e00\u952e\u5206\u6790\u7684\u7a0b\u5ea6\uff0c\u4f46\u662f\u6211\u4eec\u4e5f\u8981\u4e86\u89e3\u80cc\u540e\u7684\u539f\u7406\u3002\u672c\u6587\u63d0\u4f9b\u4e24\u79cd\u505a\u51faPCA\u7684\u65b9\u6cd5\uff0c\u4e00\u79cd\u662f\u7406\u89e3\u539f\u7406\u5f0f\u8fdb\u884c\u4e00\u6b65\u6b65\u5206\u6790\uff0c\u4e00\u79cd\u4e3a\u6253\u5305\u597d\u7684prcomp()\u51fd\u6570\u3001princomp()\u51fd\u6570\u6765\u5206\u6790\u3002<\/span><\/p>\n<p style=\"text-align: center;\"><br \/><\/p>\n<p style=\"white-space: normal;\"><span style=\"font-size: 14px;\"><br \/><\/span><\/p>\n<p style=\"text-align: center;white-space: normal;\"><strong><em><span style=\"font-size: 20px;\">\u4e00\u6b65\u6b65\u505a\u51faPCA\u56fe<\/span><\/em><\/strong><\/p>\n<p style=\"text-align: left;white-space: normal;\"><strong><em>1\u3001\u6570\u636e\u6807\u51c6\u5316<\/em><\/strong><\/p>\n<p style=\"white-space: normal;\"><span style=\"font-size: 14px;\">\u4e3a\u4e86\u7edf\u4e00\u6570\u636e\u7684\u91cf\u7eb2\u5e76\u5bf9\u6570\u636e\u8fdb\u884c\u4e2d\u5fc3\u5316\uff0c\u5728\u4e3b\u6210\u5206\u5206\u6790\u4e4b\u95f4\u9700\u8981\u5bf9\u6570\u636e\u8fdb\u884c\u6807\u51c6\u5316\u3002<\/span><\/p>\n<\/section>\n<section class=\"code-snippet__fix code-snippet__js\">\n<ul class=\"code-snippet__line-index code-snippet__js\">\n<li><\/li>\n<li><\/li>\n<li><\/li>\n<li><\/li>\n<li><\/li>\n<\/ul>\n<pre class=\"code-snippet__js\" data-lang=\"c\"><code><span class=\"code-snippet_outer\">#\u4f7f\u7528R\u4e2d\u81ea\u5e26\u7684\u9e22\u5c3e\u82b1\u4f5c\u4e3a\u6570\u636e\u8fdb\u884c\u5b9e\u8df5<\/span><\/code><code><span class=\"code-snippet_outer\">data<-<span class=\"code-snippet__function\">iris<\/span><\/span><\/code><code><span class=\"code-snippet_outer\"><span class=\"code-snippet__title\">head<\/span><span class=\"code-snippet__params\">(data)<\/span><\/span><\/code><code><span class=\"code-snippet_outer\">#\u7528\u51fd\u6570scale\uff08\uff09\u8fdb\u884c\u5f52\u4e00\u5316\u7684\u5904\u7406<\/span><\/code><code><span class=\"code-snippet_outer\">dt<-as.<span class=\"code-snippet__title\">matrix<\/span><span class=\"code-snippet__params\">(scale(data[,<span class=\"code-snippet__number\">1<\/span>:<span class=\"code-snippet__number\">4<\/span>]))<\/span><\/span><\/code><\/pre>\n<\/section>\n<section powered-by=\"xiumi.us\">\n<p style=\"white-space: normal;\"><br \/><\/p>\n<p style=\"text-align: left;white-space: normal;font-size: 16px;margin-bottom: 0px;letter-spacing: 0.578px;\"><strong><em>2\u3001\u8ba1\u7b97\u76f8\u5173\u7cfb\u6570\u77e9\u9635<\/em><\/strong><\/p>\n<p style=\"white-space: normal;\"><span style=\"font-size: 14px;\">\u4e3b\u6210\u5206\u5373\u627e\u51fa\u89e3\u91ca\u53d8\u91cf\u65b9\u5dee\u6700\u5927\u7684\u4e3b\u6210\u5206\uff0c\u6240\u4ee5\u9700\u8981\u8ba1\u7b97\u53d8\u91cf\u4e4b\u95f4\u534f\u65b9\u5dee\u3002\u7528cor\uff08\uff09\u8fdb\u884c\u8ba1\u7b97\u76f8\u5173\u7cfb\u6570\u77e9\u9635<\/span><\/p>\n<\/section>\n<section class=\"code-snippet__fix code-snippet__js\">\n<ul class=\"code-snippet__line-index code-snippet__js\">\n<li><\/li>\n<li><\/li>\n<\/ul>\n<pre class=\"code-snippet__js\" data-lang=\"c\"><code><span class=\"code-snippet_outer\">data_cor<-cor(dt)<\/span><\/code><code><span class=\"code-snippet_outer\">data_cor<\/span><\/code><\/pre>\n<\/section>\n<section powered-by=\"xiumi.us\">\n<p style=\"white-space: normal;\"><br \/><\/p>\n<p style=\"text-align: left;white-space: normal;font-size: 16px;margin-bottom: 0px;letter-spacing: 0.578px;\"><strong><em>3\u3001\u7279\u5f81\u503c\u7279\u5f81\u5411\u91cf<\/em><\/strong><\/p>\n<\/section>\n<section class=\"code-snippet__fix code-snippet__js\">\n<ul class=\"code-snippet__line-index code-snippet__js\">\n<li><\/li>\n<li><\/li>\n<li><\/li>\n<li><\/li>\n<li><\/li>\n<\/ul>\n<pre class=\"code-snippet__js\" data-lang=\"c\"><code><span class=\"code-snippet_outer\">data_s<-eigen(data_cor)#\u8ba1\u7b97\u7279\u5f81\u503c\u7279\u5f81\u5411\u91cf<\/span><\/code><code><span class=\"code-snippet_outer\">data_s<\/span><\/code><code><span class=\"code-snippet_outer\">val <- data_s$values #\u63d0\u53d6\u4e3b\u6210\u5206\u90e8\u5206\uff08\u5373\u7279\u5f81\u5411\u91cf\uff09values<\/span><\/code><code><span class=\"code-snippet_outer\">standard_deviation <- <span class=\"code-snippet__built_in\">sqrt<\/span>(val) #\u6362\u7b97\u4e3a<span class=\"code-snippet__built_in\">sqrt<\/span>\uff08\uff09\u6807\u51c6\u5dee\u7684\u5f62\u5f0f<\/span><\/code><code><span class=\"code-snippet_outer\">pro_v <- val\/sum(val)#\u8ba1\u7b97\u8d21\u732e\u7387\uff0c\u4f5c\u4e3a\u540e\u8fb9\u7684X\u548cY\u8f74\u7684\u6807\u9898<\/span><\/code><\/pre>\n<\/section>\n<section powered-by=\"xiumi.us\">\n<p style=\"white-space: normal;\"><br \/><\/p>\n<p style=\"text-align: left;white-space: normal;font-size: 16px;margin-bottom: 0px;letter-spacing: 0.578px;\"><strong><em>4\u3001\u8ba1\u7b97\u4e3b\u6210\u5206\u5f97\u5206<\/em><\/strong><\/p>\n<\/section>\n<section class=\"code-snippet__fix code-snippet__js\">\n<ul class=\"code-snippet__line-index code-snippet__js\">\n<li><\/li>\n<li><\/li>\n<li><\/li>\n<li><\/li>\n<li><\/li>\n<li><\/li>\n<\/ul>\n<pre class=\"code-snippet__js\" data-lang=\"c\"><code><span class=\"code-snippet_outer\">#\u63d0\u53d6\u7ed3\u679c\u4e2d\u7684\u7279\u5f81\u5411\u91cf<\/span><\/code><code><span class=\"code-snippet_outer\">U<-as.matrix(data_s$vectors)<\/span><\/code><code><span class=\"code-snippet_outer\">#\u8fdb\u884c\u77e9\u9635\u4e58\u6cd5\uff0c\u83b7\u5f97\u4e3b\u6210\u5206\u5f97\u5206\uff1b<\/span><\/code><code><span class=\"code-snippet_outer\">pc <-dt %*% <span class=\"code-snippet__function\">U<\/span><\/span><\/code><code><span class=\"code-snippet_outer\"><span class=\"code-snippet__title\">colnames<\/span><span class=\"code-snippet__params\">(pc)<\/span> <- <span class=\"code-snippet__title\">c<\/span><span class=\"code-snippet__params\">(<span class=\"code-snippet__string\">\"PC1\"<\/span>,<span class=\"code-snippet__string\">\"PC2\"<\/span>,<span class=\"code-snippet__string\">\"PC3\"<\/span>,<span class=\"code-snippet__string\">\"PC4\"<\/span>)<\/span><\/span><\/code><code><span class=\"code-snippet_outer\"><span class=\"code-snippet__title\">head<\/span><span class=\"code-snippet__params\">(pc)<\/span><\/span><\/code><\/pre>\n<\/section>\n<section powered-by=\"xiumi.us\">\n<p style=\"white-space: normal;\"><br \/><\/p>\n<p style=\"text-align: left;white-space: normal;font-size: 16px;margin-bottom: 0px;letter-spacing: 0.578px;\"><strong><em>5\u3001\u7ed8\u5236\u56fe<\/em><\/strong><\/p>\n<\/section>\n<section class=\"code-snippet__fix code-snippet__js\">\n<ul class=\"code-snippet__line-index code-snippet__js\">\n<li><\/li>\n<li><\/li>\n<li><\/li>\n<li><\/li>\n<li><\/li>\n<li><\/li>\n<li><\/li>\n<li><\/li>\n<li><\/li>\n<li><\/li>\n<li><\/li>\n<li><\/li>\n<li><\/li>\n<li><\/li>\n<li><\/li>\n<\/ul>\n<pre class=\"code-snippet__js\" data-lang=\"c\"><code><span class=\"code-snippet_outer\">#\u5c06iris\u6570\u636e\u96c6\u7684\u7b2c<span class=\"code-snippet__number\">5<\/span>\u5217\u7269\u79cd\u6570\u636e\u52a0\u4e0a\u5408\u5e76\u8fdb\u6765\uff1b<\/span><\/code><code><span class=\"code-snippet_outer\">df<-data.frame(PC,iris$Species)<\/span><\/code><code><span class=\"code-snippet_outer\">head(df)<\/span><\/code><code><span class=\"code-snippet_outer\">#\u7528ggplot2\u7ed8\u5236\u56fe<\/span><\/code><code><span class=\"code-snippet_outer\">#\u8f7d\u5165ggplot2\u5305\uff1b<\/span><\/code><code><span class=\"code-snippet_outer\">library(ggplot2)<\/span><\/code><code><span class=\"code-snippet_outer\">#\u63d0\u53d6\u4e3b\u6210\u5206\u7684\u65b9\u5dee\u8d21\u732e\u7387\uff0c\u751f\u6210\u5750\u6807\u8f74\u6807\u9898\uff1b<\/span><\/code><code><span class=\"code-snippet_outer\">xlab<-paste0(<span class=\"code-snippet__string\">\"PC1(\"<\/span>,round(pro_v[<span class=\"code-snippet__number\">1<\/span>]*<span class=\"code-snippet__number\">100<\/span>,<span class=\"code-snippet__number\">2<\/span>),<span class=\"code-snippet__string\">\"%)\"<\/span>)#\u8bbe\u7f6ex\u8f74\u7684\u6807\u9898<\/span><\/code><code><span class=\"code-snippet_outer\">ylab<-paste0(<span class=\"code-snippet__string\">\"PC2(\"<\/span>,round(pro_v[<span class=\"code-snippet__number\">2<\/span>]*<span class=\"code-snippet__number\">100<\/span>,<span class=\"code-snippet__number\">2<\/span>),<span class=\"code-snippet__string\">\"%)\"<\/span>)#\u8bbe\u7f6ey\u8f74\u7684\u6807\u9898<\/span><\/code><code><span class=\"code-snippet_outer\">#\u7ed8\u5236\u6563\u70b9\u56fe\u5e76\u6dfb\u52a0\u7f6e\u4fe1\u692d\u5706\uff1b<\/span><\/code><code><span class=\"code-snippet_outer\">p1<-ggplot(data = df,aes(x=PC1,y=PC2,color=iris.Species))+<\/span><\/code><code><span class=\"code-snippet_outer\">stat_ellipse(aes(fill=iris.Species),<\/span><\/code><code><span class=\"code-snippet_outer\">type =<span class=\"code-snippet__string\">\"norm\"<\/span>, geom =<span class=\"code-snippet__string\">\"polygon\"<\/span>,alpha=<span class=\"code-snippet__number\">0.2<\/span>,color=NA)+<\/span><\/code><code><span class=\"code-snippet_outer\">geom_point()+<span class=\"code-snippet__built_in\">labs<\/span>(x=xlab,y=ylab,color=<span class=\"code-snippet__string\">\"\"<\/span>)+<\/span><\/code><code><span class=\"code-snippet_outer\">guides(fill=F)<\/span><\/code><\/pre>\n<\/section>\n<section powered-by=\"xiumi.us\">\n<p style=\"white-space: normal;\"><br \/><\/p>\n<p style=\"white-space: normal;\"><span style=\"font-size: 14px;\">p1<\/span><\/p>\n<p style=\"white-space: normal;\"><span style=\"font-size: 14px;\"> <\/span><\/p>\n<p style=\"text-align: center;\"><img decoding=\"async\" class=\"rich_pages wxw-img\" data-galleryid=\"\" data-ratio=\"0.776173285198556\" data-s=\"300,640\" src=\"https:\/\/i0.wp.com\/www.biocloudservice.com\/wordpress\/wp-content\/uploads\/2024\/06\/2_TsFJ8Saqiaz4VNPavYQPAQ6joXXBQA.png?w=640\" onerror=\"this.src='https:\/\/mmbiz.qpic.cn\/sz_mmbiz_png\/zcicibWZessAwIX3hF1ZZeqvXLknM5Oq7CfrYlwfoG4Gr7eic1otumyAX3icLTsFJ8Saqiaz4VNPavYQPAQ6joXXBQA\/640?wx_fmt=png'\" data-type=\"png\" data-w=\"554\" style=\"\" data-recalc-dims=\"1\" \/><\/p>\n<p style=\"text-align: center;white-space: normal;\"><strong><em><span style=\"font-size: 20px;\"><br \/><\/span><\/em><\/strong><\/p>\n<p style=\"text-align: center;white-space: normal;\"><strong><em><span style=\"font-size: 20px;\"><br \/><\/span><\/em><\/strong><\/p>\n<p style=\"text-align: center;white-space: normal;\"><strong><em><span style=\"font-size: 20px;\">\u4f7f\u7528\u73b0\u5728\u5c01\u88c5\u597d\u7684\u51fd\u6570\u8fdb\u884cPCA\u5206\u6790<\/span><\/em><\/strong><\/p>\n<p style=\"white-space: normal;\"><span style=\"font-size: 14px;\">prcomp()\u51fd\u6570\u3001princomp()\u51fd\u6570\u53ef\u4ee5\u5bf9\u4e0a\u8ff0\u6b65\u9aa4\u8fdb\u884c\u4e00\u6b21\u6027\u5206\u6790<\/span><\/p>\n<p style=\"white-space: normal;\"><span style=\"font-size: 14px;\">#\u4f7f\u7528prcomp()\u51fd\u6570\u8fdb\u884c\u76f4\u63a5PCA\u7684\u8ba1\u7b97<\/span><\/p>\n<p style=\"white-space: normal;\"><span style=\"font-size: 14px;\">com1 <- prcomp(data[,1:4], center = TRUE,scale. = TRUE)<\/span><\/p>\n<p style=\"white-space: normal;\"><span style=\"font-size: 14px;\">summary(com1)<\/span><\/p>\n<p style=\"white-space: normal;\"><span style=\"font-size: 14px;\"> <\/span><\/p>\n<p style=\"text-align: center;\"><img decoding=\"async\" class=\"rich_pages wxw-img\" data-galleryid=\"\" data-ratio=\"0.2545126353790614\" data-s=\"300,640\" src=\"https:\/\/i0.wp.com\/www.biocloudservice.com\/wordpress\/wp-content\/uploads\/2024\/06\/3_70ic9wckNKWLpduyVXSibBM9FFqVzA.png?w=640\" onerror=\"this.src='https:\/\/mmbiz.qpic.cn\/sz_mmbiz_png\/zcicibWZessAwIX3hF1ZZeqvXLknM5Oq7CazQVXyCwQTTRQBXNRk1bNvTkeD70ic9wckNKWLpduyVXSibBM9FFqVzA\/640?wx_fmt=png'\" data-type=\"png\" data-w=\"554\" style=\"\" data-recalc-dims=\"1\" \/><\/p>\n<p style=\"white-space: normal;\"><span style=\"font-size: 14px;\">\u540e\u7eed\u7684\u9700\u8981\u5408\u5e76\u9e22\u5c3e\u82b1\u5c5e\u7684\u5217\uff08\u57305\u5217\uff09\uff0c\u6700\u540e\u505a\u51fa\u5b9e\u73b0PCA\u53ef\u89c6\u5316\u5373\u53ef\u3002<\/span><\/p>\n<p style=\"white-space: normal;\"><span style=\"font-size: 14px;\"><br \/><\/span><\/p>\n<p style=\"white-space: normal;\"><span style=\"font-size: 14px;\"><br \/><\/span><\/p>\n<p style=\"text-align: center;white-space: normal;\"><strong><em><span style=\"font-size: 20px;\">PCA\u901a\u4fd7\u6613\u61c2\u7684\u7406\u89e3<\/span><\/em><\/strong><\/p>\n<p style=\"white-space: normal;\"><span style=\"font-size: 14px;\">Principal Component Analysis(PCA)\u4e3b\u6210\u5206\u5206\u6790\u5b83\u672c\u8d28\u662f\u628a\u6570\u636e\u89c6\u4e3a\u4e00\u4e2a\u591a\u7ef4\u5ea6\u7684\u5b58\u5728\uff0c\u4f46\u662f\u6bcf\u4e2a\u7eac\u5ea6\u5bf9\u6574\u4e2a\u6570\u636e\u96c6\u7684\u8d21\u732e\u5ea6\u662f\u4e0d\u4e00\u6837\u7684\uff0c\u4e3a\u4e86\u65b9\u4fbf\u89c2\u5bdf\uff0c\u6211\u4eec\u4f1a\u5bf9\u8d21\u732e\u7387\u4f4e\u7684\u7eac\u5ea6\u8fdb\u884c\u5ffd\u7565\uff0c\u4fdd\u75592\u7ef4\u6216\u80053\u7ef4\u7684\u5185\u5bb9\uff0c\u90a3\u7559\u4e0b\u7684\u4e09\u4e2a\u7eac\u5ea6\u90fd\u662f\u8d77\u5230\u91cd\u8981\u4f5c\u7528\u7684\uff0c\u56e0\u6b64\u79f0\u4e3a\u4e3b\u6210\u5206\uff0c\u4f46\u662f\u4ed6\u5bf9\u4e8e\u6574\u4e2a\u6570\u636e\u96c6\u7684\u8d21\u732e\u5e76\u4e0d\u662f1\uff0c\u6240\u4ee5\u6211\u4eec\u770b\u5230\u6a2a\u7eb5\u5750\u6807\u5e76\u4e0d\u662f1\uff0c\u800c\u662f<1\u7684\u6570\u3002<\/span><\/p>\n<p style=\"white-space: normal;\"><span style=\"font-size: 14px;\"> <\/span><\/p>\n<p style=\"white-space: normal;\"><span 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