{"id":2017,"date":"2023-07-24T02:03:35","date_gmt":"2023-07-24T02:03:35","guid":{"rendered":"https:\/\/statorials.org\/cn\/%e8%99%b9%e8%86%9c-r-%e6%95%b0%e6%8d%ae%e9%9b%86\/"},"modified":"2023-07-24T02:03:35","modified_gmt":"2023-07-24T02:03:35","slug":"%e8%99%b9%e8%86%9c-r-%e6%95%b0%e6%8d%ae%e9%9b%86","status":"publish","type":"post","link":"https:\/\/statorials.org\/cn\/%e8%99%b9%e8%86%9c-r-%e6%95%b0%e6%8d%ae%e9%9b%86\/","title":{"rendered":"R \u4e2d iris \u6570\u636e\u96c6\u7684\u5b8c\u6574\u6307\u5357"},"content":{"rendered":"<p><\/p>\n<hr>\n<p><span style=\"color: #000000;\"><strong>iris<\/strong>\u6570\u636e\u96c6\u662f R \u4e2d\u7684\u96c6\u6210\u6570\u636e\u96c6\uff0c\u5305\u542b 3 \u4e2a\u4e0d\u540c\u7269\u79cd\u7684 50 \u6735\u82b1\u7684 4 \u4e2a\u4e0d\u540c\u5c5e\u6027\uff08\u4ee5\u5398\u7c73\u4e3a\u5355\u4f4d\uff09\u7684\u6d4b\u91cf\u503c\u3002<\/span><\/p>\n<p><span style=\"color: #000000;\">\u672c\u6559\u7a0b\u4ee5 iris \u6570\u636e\u96c6\u4e3a\u4f8b\uff0c\u4ecb\u7ecd\u5982\u4f55\u5728 R \u4e2d\u63a2\u7d22\u548c\u603b\u7ed3\u6570\u636e\u96c6\u3002<\/span><\/p>\n<p><span style=\"color: #000000;\"><strong>\u76f8\u5173\uff1a<\/strong> <a href=\"https:\/\/statorials.org\/cn\/mtcars-r-\u6570\u636e\u96c6\/\" target=\"_blank\" rel=\"noopener\">R \u4e2d mtcars \u6570\u636e\u96c6\u7684\u5b8c\u6574\u6307\u5357<\/a><\/span><\/p>\n<h3><span style=\"color: #000000;\"><strong>\u52a0\u8f7d\u9e22\u5c3e\u82b1\u6570\u636e\u96c6<\/strong><\/span><\/h3>\n<p><span style=\"color: #000000;\">\u7531\u4e8eiris\u6570\u636e\u96c6\u662fR\u4e2d\u7684\u5185\u7f6e\u6570\u636e\u96c6\uff0c\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u547d\u4ee4\u52a0\u8f7d\u5b83\uff1a<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <span style=\"color: #000000;\"><strong>data(iris)<\/strong><\/span><\/pre>\n<p><span style=\"color: #000000;\">\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528<strong>head()<\/strong>\u51fd\u6570\u67e5\u770b\u6570\u636e\u96c6\u7684\u524d\u516d\u884c\uff1a<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <span style=\"color: #000000;\"><strong><span style=\"color: #008080;\">#view first six rows of iris dataset<\/span>\nhead(iris)\n\n  Sepal.Length Sepal.Width Petal.Length Petal.Width Species\n1 5.1 3.5 1.4 0.2 setosa\n2 4.9 3.0 1.4 0.2 setosa\n3 4.7 3.2 1.3 0.2 setosa\n4 4.6 3.1 1.5 0.2 setosa\n5 5.0 3.6 1.4 0.2 setosa\n6 5.4 3.9 1.7 0.4 setosa\n<\/strong><\/span><\/pre>\n<h3><span style=\"color: #000000;\"><strong>\u603b\u7ed3 Iris \u6570\u636e\u96c6<\/strong><\/span><\/h3>\n<p><span style=\"color: #000000;\">\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528<strong>summary()<\/strong>\u51fd\u6570\u5feb\u901f\u603b\u7ed3\u6570\u636e\u96c6\u4e2d\u7684\u6bcf\u4e2a\u53d8\u91cf\uff1a<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <span style=\"color: #000000;\"><strong><span style=\"color: #008080;\">#summarize iris dataset<\/span>\nsummary(iris)\n\n  Sepal.Length Sepal.Width Petal.Length Petal.Width   \n Min. :4,300 Min. :2,000 Min. :1,000 Min. :0.100  \n 1st Qu.:5.100 1st Qu.:2.800 1st Qu.:1.600 1st Qu.:0.300  \n Median: 5,800 Median: 3,000 Median: 4,350 Median: 1,300  \n Mean:5.843 Mean:3.057 Mean:3.758 Mean:1.199  \n 3rd Qu.:6,400 3rd Qu.:3,300 3rd Qu.:5,100 3rd Qu.:1,800  \n Max. :7,900 Max. :4,400 Max. :6,900 Max. :2,500  \n       Species  \n setosa:50  \n versicolor:50  \n virginica :50<\/strong><\/span><\/pre>\n<p><span style=\"color: #000000;\">\u5bf9\u4e8e\u6bcf\u4e2a\u6570\u503c\u53d8\u91cf\uff0c\u6211\u4eec\u53ef\u4ee5\u770b\u5230\u4ee5\u4e0b\u4fe1\u606f\uff1a<\/span><\/p>\n<ul>\n<li><span style=\"color: #000000;\"><strong>\u6700\u5c0f\u503c<\/strong>\uff1a\u6700\u5c0f\u503c\u3002<\/span><\/li>\n<li><span style=\"color: #000000;\"><strong>\u7b2c\u4e00\u4e2a Qu<\/strong> \uff1a\u7b2c\u4e00\u4e2a\u56db\u5206\u4f4d\u6570\uff08\u7b2c 25 \u4e2a\u767e\u5206\u4f4d\u6570\uff09\u7684\u503c\u3002<\/span><\/li>\n<li><span style=\"color: #000000;\"><strong>\u4e2d\u4f4d\u6570<\/strong>\uff1a\u4e2d\u503c\u3002<\/span><\/li>\n<li><span style=\"color: #000000;\"><strong>\u5e73\u5747\u503c<\/strong>\uff1a\u5e73\u5747\u503c\u3002<\/span><\/li>\n<li><span style=\"color: #000000;\"><strong>\u7b2c\u4e09\u66f2<\/strong>\uff1a\u7b2c\u4e09\u4e2a\u56db\u5206\u4f4d\u6570\uff08\u7b2c 75 \u4e2a\u767e\u5206\u4f4d\u6570\uff09\u7684\u503c\u3002<\/span><\/li>\n<li><span style=\"color: #000000;\"><strong>\u6700\u5927\u503c<\/strong>\uff1a\u6700\u5927\u503c\u3002<\/span><\/li>\n<\/ul>\n<p><span style=\"color: #000000;\">\u5bf9\u4e8e\u6570\u636e\u96c6\u4e2d\u552f\u4e00\u7684\u5206\u7c7b\u53d8\u91cf\uff08\u7269\u79cd\uff09\uff0c\u6211\u4eec\u770b\u5230\u6bcf\u4e2a\u503c\u7684\u9891\u7387\u8ba1\u6570\uff1a<\/span><\/p>\n<ul>\n<li> <span style=\"color: #000000;\"><strong>setosa<\/strong> \uff1a\u8be5\u7269\u79cd\u51fa\u73b0\u4e86 50 \u6b21\u3002<\/span><\/li>\n<li><span style=\"color: #000000;\"><strong>\u6742\u8272<\/strong>\uff1a\u8be5\u7269\u79cd\u51fa\u73b0 50 \u6b21\u3002<\/span><\/li>\n<li> <span style=\"color: #000000;\"><strong>virginica<\/strong> \uff1a\u8be5\u7269\u79cd\u51fa\u73b0\u4e86 50 \u6b21\u3002<\/span><\/li>\n<\/ul>\n<p><span style=\"color: #000000;\">\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528<strong>dim()<\/strong>\u51fd\u6570\u83b7\u53d6\u6570\u636e\u96c6\u7684\u884c\u6570\u548c\u5217\u6570\u7ef4\u5ea6\uff1a<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <span style=\"color: #000000;\"><strong><span style=\"color: #008080;\">#display rows and columns<\/span>\ndim(iris)\n\n[1] 150 5\n<\/strong><\/span><\/pre>\n<p><span style=\"color: #000000;\">\u6211\u4eec\u53ef\u4ee5\u770b\u5230\u6570\u636e\u96c6\u6709<strong>150<\/strong>\u884c\u548c<strong>5<\/strong>\u5217\u3002<\/span><\/p>\n<p><span style=\"color: #000000;\">\u6211\u4eec\u8fd8\u53ef\u4ee5\u4f7f\u7528<strong>names()<\/strong>\u51fd\u6570\u6765\u663e\u793a\u6570\u636e\u6846\u7684\u5217\u540d\u79f0\uff1a<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <span style=\"color: #000000;\"><strong><span style=\"color: #008080;\">#display column names<\/span>\nnames(iris)\n\n[1] \"Sepal.Length\" \"Sepal.Width\" \"Petal.Length\" \"Petal.Width\" \"Species\"     \n<\/strong><\/span><\/pre>\n<h3><span style=\"color: #000000;\"><strong>\u53ef\u89c6\u5316 Iris \u6570\u636e\u96c6<\/strong><\/span><\/h3>\n<p><span style=\"color: #000000;\">\u6211\u4eec\u8fd8\u53ef\u4ee5\u521b\u5efa\u7ed8\u56fe\u6765\u53ef\u89c6\u5316\u6570\u636e\u96c6\u7684\u503c\u3002<\/span><\/p>\n<p><span style=\"color: #000000;\">\u4f8b\u5982\uff0c\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528<strong>hist()<\/strong>\u51fd\u6570\u521b\u5efa\u67d0\u4e2a\u53d8\u91cf\u503c\u7684\u76f4\u65b9\u56fe\uff1a<\/span> <\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <span style=\"color: #000000;\"><strong><span style=\"color: #008080;\">#create histogram of values for sepal length<\/span>\nhist(iris$Sepal.Length,\n     col=' <span style=\"color: #ff0000;\">steelblue<\/span> ',\n     main=' <span style=\"color: #ff0000;\">Histogram<\/span> ',\n     xlab=' <span style=\"color: #ff0000;\">Length<\/span> ',\n     ylab=' <span style=\"color: #ff0000;\">Frequency<\/span> ')\n<\/strong><\/span><\/pre>\n<p><img decoding=\"async\" loading=\"lazy\" class=\" wp-image-18908 aligncenter\" src=\"https:\/\/statorials.org\/wp-content\/uploads\/2023\/08\/iris1.png\" alt=\"\" width=\"456\" height=\"462\" srcset=\"\" sizes=\"auto, \"><\/p>\n<p><span style=\"color: #000000;\">\u6211\u4eec\u8fd8\u53ef\u4ee5\u4f7f\u7528<strong>plot()<\/strong>\u51fd\u6570\u521b\u5efa\u4efb\u610f\u53d8\u91cf\u6210\u5bf9\u7ec4\u5408\u7684\u6563\u70b9\u56fe\uff1a<\/span> <\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <span style=\"color: #000000;\"><strong><span style=\"color: #008080;\">#create scatterplot of sepal width vs. sepal length<\/span>\nplot(iris$Sepal.Width, iris$Sepal.Length,\n     col=' <span style=\"color: #ff0000;\">steelblue<\/span> ',\n     main=' <span style=\"color: #ff0000;\">Scatterplot<\/span> ',\n     xlab=' <span style=\"color: #ff0000;\">Sepal Width<\/span> ',\n     ylab=' <span style=\"color: #ff0000;\">Sepal Length<\/span> ',\n     pch= <span style=\"color: #008000;\">19<\/span> )<\/strong><\/span> <\/pre>\n<p><img decoding=\"async\" loading=\"lazy\" class=\" wp-image-18909 aligncenter\" src=\"https:\/\/statorials.org\/wp-content\/uploads\/2023\/08\/iris2.png\" alt=\"\" width=\"467\" height=\"452\" srcset=\"\" sizes=\"auto, \"><\/p>\n<p><span style=\"color: #000000;\">\u6211\u4eec\u8fd8\u53ef\u4ee5\u4f7f\u7528<strong>boxplot()<\/strong>\u51fd\u6570\u4e3a\u6bcf\u4e2a\u7ec4\u521b\u5efa\u7bb1\u7ebf\u56fe\uff1a<\/span> <\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <span style=\"color: #000000;\"><strong><span style=\"color: #008080;\">#create scatterplot of sepal width vs. sepal length<\/span>\nboxplot(Sepal.Length~Species,\n        data=iris,\n        main=' <span style=\"color: #ff0000;\">Sepal Length by Species<\/span> ',\n        xlab=' <span style=\"color: #ff0000;\">Species<\/span> ',\n        ylab=' <span style=\"color: #ff0000;\">Sepal Length<\/span> ',\n        col=' <span style=\"color: #ff0000;\">steelblue<\/span> ',\n        border=' <span style=\"color: #ff0000;\">black<\/span> ')<\/strong><\/span> <\/pre>\n<p><img decoding=\"async\" loading=\"lazy\" class=\" wp-image-18910 aligncenter\" src=\"https:\/\/statorials.org\/wp-content\/uploads\/2023\/08\/iris3.png\" alt=\"\" width=\"439\" height=\"431\" srcset=\"\" sizes=\"auto, \"><\/p>\n<p> <span style=\"color: #000000;\">x \u8f74\u663e\u793a\u4e09\u4e2a\u7269\u79cd\uff0cy \u8f74\u663e\u793a\u6bcf\u4e2a\u7269\u79cd\u7684\u843c\u7247\u957f\u5ea6\u503c\u7684\u5206\u5e03\u3002<\/span><\/p>\n<p><span style=\"color: #000000;\">\u8fd9\u79cd\u7c7b\u578b\u7684\u56fe\u4f7f\u6211\u4eec\u80fd\u591f\u5feb\u901f\u770b\u51fa\uff0c\u5f17\u5409\u5c3c\u4e9a\u7269\u79cd\u7684\u843c\u7247\u957f\u5ea6\u5f80\u5f80\u662f\u6700\u5927\u7684\uff0c\u800c\u5c71\u6843\u7269\u79cd\u7684\u843c\u7247\u957f\u5ea6\u5f80\u5f80\u662f\u6700\u5c0f\u7684\u3002<\/span><\/p>\n<h3><span style=\"color: #000000;\"><strong>\u5176\u4ed6\u8d44\u6e90<\/strong><\/span><\/h3>\n<p><span style=\"color: #000000;\">\u4ee5\u4e0b\u6559\u7a0b\u66f4\u8be6\u7ec6\u5730\u89e3\u91ca\u4e86\u5982\u4f55\u5728 R \u4e2d\u6c47\u603b\u6570\u636e\u96c6\uff1a<\/span><\/p>\n<p><a href=\"https:\/\/statorials.org\/cn\/r\u4e2d\u7684\u6c47\u603b\u8868\/\" target=\"_blank\" rel=\"noopener\">\u5728 R \u4e2d\u521b\u5efa\u6c47\u603b\u8868\u7684\u6700\u7b80\u5355\u65b9\u6cd5<\/a><br \/><a href=\"https:\/\/statorials.org\/cn\/r-\u4e2d\u603b\u7ed3\u7684\u4e94\u4e2a\u6570\u5b57\/\" target=\"_blank\" rel=\"noopener\">\u5982\u4f55\u5728R\u4e2d\u8ba1\u7b97\u4e94\u4e2a\u6570\u5b57\u7684\u603b\u548c<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>iris\u6570\u636e\u96c6\u662f R \u4e2d\u7684\u96c6\u6210\u6570\u636e\u96c6\uff0c\u5305\u542b 3 \u4e2a\u4e0d\u540c\u7269\u79cd\u7684 50 \u6735\u82b1\u7684 4 \u4e2a\u4e0d\u540c\u5c5e\u6027\uff08\u4ee5\u5398\u7c73\u4e3a\u5355\u4f4d\uff09\u7684\u6d4b [&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-2017","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 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