{"id":948,"date":"2023-07-28T05:33:50","date_gmt":"2023-07-28T05:33:50","guid":{"rendered":"https:\/\/statorials.org\/cn\/%e7%bb%84%e6%81%a2%e5%a4%8d%e6%95%b0%e6%8d%aer\/"},"modified":"2023-07-28T05:33:50","modified_gmt":"2023-07-28T05:33:50","slug":"%e7%bb%84%e6%81%a2%e5%a4%8d%e6%95%b0%e6%8d%aer","status":"publish","type":"post","link":"https:\/\/statorials.org\/cn\/%e7%bb%84%e6%81%a2%e5%a4%8d%e6%95%b0%e6%8d%aer\/","title":{"rendered":"\u5b8c\u6574\u6307\u5357\uff1a\u5982\u4f55\u5728 r \u4e2d\u5bf9\u6570\u636e\u8fdb\u884c\u5206\u7ec4\u548c\u6c47\u603b"},"content":{"rendered":"<p><\/p>\n<hr>\n<p><span style=\"color: #000000;\">\u5206\u6790\u6570\u636e\u65f6\u6700\u5e38\u89c1\u7684\u4e24\u4e2a\u4efb\u52a1\u662f\u5bf9\u6570\u636e\u8fdb\u884c\u5206\u7ec4\u548c\u6c47\u603b\u3002<\/span><\/p>\n<p><span style=\"color: #000000;\">\u5e78\u8fd0\u7684\u662f\uff0cR \u4e2d\u7684<a href=\"https:\/\/dplyr.tidyverse.org\/\" target=\"_blank\" rel=\"noopener noreferrer\">dplyr<\/a>\u5305\u5141\u8bb8\u60a8\u5feb\u901f\u5206\u7ec4\u548c\u6c47\u603b\u6570\u636e\u3002<\/span><\/p>\n<p><span style=\"color: #000000;\">\u672c\u6559\u7a0b\u63d0\u4f9b\u4e86 dplyr \u5165\u95e8\u7684\u5feb\u901f\u6307\u5357\u3002<\/span><\/p>\n<h2><span style=\"color: #000000;\"><strong>\u5b89\u88c5\u5e76\u52a0\u8f7d dplyr \u5305<\/strong><\/span><\/h2>\n<p><span style=\"color: #000000;\">\u5728\u4f7f\u7528 dplyr \u5305\u4e2d\u7684\u51fd\u6570\u4e4b\u524d\uff0c\u5fc5\u987b\u5148\u52a0\u8f7d\u8be5\u5305\uff1a<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #008080;\">#install dplyr (if not already installed)\n<span style=\"color: #000000;\">install.packages(' <span style=\"color: #008000;\">dplyr<\/span> ')<\/span>\n\n#load dplyr<\/span> \nlibrary(dplyr)<\/strong><\/pre>\n<p><span style=\"color: #000000;\">\u63a5\u4e0b\u6765\uff0c\u6211\u4eec\u5c06\u8bf4\u660e\u4f7f\u7528 dplyr \u7684\u51fd\u6570\u4f7f\u7528\u540d\u4e3a<strong>mtcars<\/strong>\u7684\u5185\u7f6e R \u6570\u636e\u96c6\u5bf9\u6570\u636e\u8fdb\u884c\u5206\u7ec4\u548c\u6c47\u603b\u7684\u51e0\u4e2a\u793a\u4f8b\uff1a<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #008080;\">#obtain rows and columns of <em>mtcars<\/em><\/span>\ndim(mtcars)\n\n[1] 32 11\n\n<span style=\"color: #008080;\">#view first six rows of <em>mtcars<\/em>\n<\/span>head(mtcars)\n\n                   mpg cyl disp hp drat wt qsec vs am gear carb\nMazda RX4 21.0 6 160 110 3.90 2.620 16.46 0 1 4 4\nMazda RX4 Wag 21.0 6 160 110 3.90 2.875 17.02 0 1 4 4\nDatsun 710 22.8 4 108 93 3.85 2.320 18.61 1 1 4 1\nHornet 4 Drive 21.4 6 258 110 3.08 3.215 19.44 1 0 3 1\nHornet Sportabout 18.7 8 360 175 3.15 3.440 17.02 0 0 3 2\nValiant 18.1 6 225 105 2.76 3,460 20.22 1 0 3 1<\/strong><\/pre>\n<p><span style=\"color: #000000;\">\u6211\u4eec\u5c06\u7528\u4e8e\u5206\u7ec4\u548c\u6c47\u603b\u6570\u636e\u7684\u57fa\u672c\u8bed\u6cd5\u662f\uff1a<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong>data %&gt;%\n  <span style=\"color: #3366ff;\">group_by<\/span> (col_name) %&gt;%\n  <span style=\"color: #3366ff;\">summarize<\/span> (summary_name = summary_function)\n<\/strong><\/pre>\n<p><span style=\"color: #000000;\"><em><strong>\u6ce8\u610f\uff1a<\/strong> summarise() \u548c summarise() \u51fd\u6570\u662f\u7b49\u6548\u7684\u3002<\/em><\/span><\/p>\n<h2><strong>\u793a\u4f8b 1\uff1a\u6309\u7ec4\u67e5\u627e\u5e73\u5747\u503c\u548c\u4e2d\u4f4d\u6570<\/strong><\/h2>\n<p><span style=\"color: #000000;\">\u4ee5\u4e0b\u4ee3\u7801\u663e\u793a\u4e86\u5982\u4f55\u6309\u7ec4\u8ba1\u7b97 <a href=\"https:\/\/statorials.org\/cn\/\u8861\u91cf\u96c6\u4e2d\u8d8b\u52bf\/\" target=\"_blank\" rel=\"noopener noreferrer\">\u96c6\u4e2d\u8d8b\u52bf\u5ea6\u91cf\uff0c<\/a>\u5305\u62ec\u5e73\u5747\u503c\u548c\u4e2d\u4f4d\u6570\uff1a<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #008080;\">#find mean mpg by cylinder<\/span>\nmtcars %&gt;%\n  <span style=\"color: #3366ff;\">group_by<\/span> (cyl) %&gt;%\n  <span style=\"color: #3366ff;\">summarize<\/span> (mean_mpg = mean(mpg, na.rm = <span style=\"color: #008000;\">TRUE<\/span> ))\n\n# A tibble: 3 x 2\n    cyl mean_mpg\n      \n1 4 26.7\n2 6 19.7\n3 8 15.1\n\n<span style=\"color: #008080;\">#find median mpg by cylinder\n<\/span>mtcars %&gt;%\n  <span style=\"color: #3366ff;\">group_by<\/span> (cyl) %&gt;%\n  <span style=\"color: #3366ff;\">summarize<\/span> (median_mpg = median(mpg, na.rm = <span style=\"color: #008000;\">TRUE<\/span> ))\n\n# A tibble: 3 x 2\n    cyl median_mpg\n        \n1 4 26  \n2 6 19.7\n3 8 15.2<\/strong><\/pre>\n<h2><strong>\u793a\u4f8b 2\uff1a\u67e5\u627e\u6309\u7fa4\u4f53\u4f20\u64ad\u7684\u5ea6\u91cf<\/strong><\/h2>\n<p><span style=\"color: #000000;\">\u4ee5\u4e0b\u4ee3\u7801\u5c55\u793a\u4e86\u5982\u4f55\u6309\u7ec4\u8ba1\u7b97\u79bb\u6563\u5ea6\u5ea6\u91cf\uff0c\u5305\u62ec\u6807\u51c6\u5dee\u3001\u56db\u5206\u4f4d\u6570\u95f4\u8ddd\u548c\u7edd\u5bf9\u4e2d\u503c\u504f\u5dee\uff1a<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #008080;\">#find sd, IQR, and mad by cylinder<\/span>\nmtcars %&gt;%\n<span style=\"color: #3366ff;\">group_by<\/span> (cyl) %&gt;%\n<span style=\"color: #3366ff;\">summarize<\/span> (sd_mpg = sd(mpg, na.rm = <span style=\"color: #008000;\">TRUE<\/span> ),\n            iqr_mpg = IQR(mpg, na.rm = <span style=\"color: #008000;\">TRUE<\/span> ),\n            mad_mpg = mad(mpg, na.rm = <span style=\"color: #008000;\">TRUE<\/span> ))\n\n# A tibble: 3 x 4\n    cyl sd_mpg iqr_mpg mad_mpg\n          \n1 4 4.51 7.60 6.52\n2 6 1.45 2.35 1.93\n3 8 2.56 1.85 1.56<\/strong><\/pre>\n<h2><strong>\u793a\u4f8b 3\uff1a\u6309\u7ec4\u67e5\u627e\u6570\u5b57<\/strong><\/h2>\n<p><span style=\"color: #000000;\">\u4ee5\u4e0b\u4ee3\u7801\u663e\u793a\u4e86\u5982\u4f55\u5728 R \u4e2d\u6309\u7ec4\u67e5\u627e\u7f16\u53f7\u548c\u552f\u4e00\u7f16\u53f7\uff1a<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #008080;\">#find row count and unique row count by cylinder<\/span>\nmtcars %&gt;%\n<span style=\"color: #3366ff;\">group_by<\/span> (cyl) %&gt;%\n<span style=\"color: #3366ff;\">summarize<\/span> (count_mpg = n(),\n            u_count_mpg = n_distinct(mpg))\n\n# A tibble: 3 x 3\n    cyl count_mpg u_count_mpg\n              \n1 4 11 9\n2 6 7 6\n3 8 14 12\n<\/strong><\/pre>\n<h2><strong>\u793a\u4f8b 4\uff1a\u6309\u7ec4\u67e5\u627e\u767e\u5206\u4f4d<\/strong><\/h2>\n<p><span style=\"color: #000000;\">\u4ee5\u4e0b\u4ee3\u7801\u663e\u793a\u4e86\u5982\u4f55\u6309\u6c14\u7f38\u7ec4\u67e5\u627e mpg \u503c\u7684\u7b2c 90 \u4e2a\u767e\u5206\u4f4d\uff1a<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #008080;\">#find 90th percentile of mpg for each cylinder group<\/span>\nmtcars %&gt;%\n<span style=\"color: #3366ff;\">group_by<\/span> (cyl) %&gt;%\n<span style=\"color: #3366ff;\">summarize<\/span> (quant90 = quantile(mpg, probs = .9))\n\n# A tibble: 3 x 2\n    cyl quant90\n     \n1 4 32.4\n2 6 21.2\n3 8 18.3<\/strong><\/pre>\n<h2><span style=\"color: #000000;\"><strong>\u5176\u4ed6\u8d44\u6e90<\/strong><\/span><\/h2>\n<p><span style=\"color: #000000;\">\u60a8\u53ef\u4ee5<a href=\"https:\/\/dplyr.tidyverse.org\/\" target=\"_blank\" rel=\"noopener noreferrer\">\u5728\u6b64\u5904<\/a>\u627e\u5230\u5b8c\u6574\u7684 dplyr \u5305\u6587\u6863\u4ee5\u53ca\u6709\u7528\u7684\u53ef\u89c6\u5316\u5907\u5fd8\u5355\u3002<\/span><\/p>\n<p><span style=\"color: #000000;\">\u60a8\u53ef\u4ee5\u4e0e<strong>group_by()<\/strong>\u548c<strong>summary()<\/strong>\u4e00\u8d77\u4f7f\u7528\u7684\u5176\u4ed6\u6709\u7528\u51fd\u6570\u5305\u62ec<a href=\"https:\/\/statorials.org\/cn\/\u8fc7\u6ee4\u884c-r\/\" target=\"_blank\" rel=\"noopener noreferrer\">\u8fc7\u6ee4\u6570\u636e\u6846\u7684\u884c<\/a>\u5e76\u6309<a href=\"https:\/\/statorials.org\/cn\/\u7ec4\u7ec7\u7ebf\u6761-r\/\" target=\"_blank\" rel=\"noopener noreferrer\">\u7279\u5b9a\u987a\u5e8f\u6392\u5217\u5b83\u4eec\u7684<\/a>\u51fd\u6570\u3002<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5206\u6790\u6570\u636e\u65f6\u6700\u5e38\u89c1\u7684\u4e24\u4e2a\u4efb\u52a1\u662f\u5bf9\u6570\u636e\u8fdb\u884c\u5206\u7ec4\u548c\u6c47\u603b\u3002 \u5e78\u8fd0\u7684\u662f\uff0cR \u4e2d\u7684dplyr\u5305\u5141\u8bb8\u60a8\u5feb\u901f\u5206\u7ec4\u548c\u6c47\u603b\u6570\u636e\u3002  [&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-948","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>\u5b8c\u6574\u6307\u5357\uff1a\u5982\u4f55\u5728 R \u4e2d\u5bf9\u6570\u636e\u8fdb\u884c\u5206\u7ec4\u548c\u6c47\u603b<\/title>\n<meta name=\"description\" content=\"\u4f7f\u7528 dplyr \u5e93\u4e2d\u7684\u51fd\u6570\u5728 R \u4e2d\u5bf9\u6570\u636e\u8fdb\u884c\u5206\u7ec4\u548c\u6c47\u603b\u7684\u5b8c\u6574\u6307\u5357\u3002\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/statorials.org\/cn\/\u7ec4\u6062\u590d\u6570\u636er\/\" 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