{"id":2785,"date":"2024-10-06T15:32:00","date_gmt":"2024-10-06T06:32:00","guid":{"rendered":"https:\/\/secondlife.lol\/?p=2785"},"modified":"2024-10-07T18:00:15","modified_gmt":"2024-10-07T09:00:15","slug":"r-%eb%8d%b0%ec%9d%b4%ed%84%b0%eb%b6%84%ec%84%9d-%ec%98%88%ec%a0%9c-%eb%b6%93%ea%bd%83-iris-%eb%8d%b0%ec%9d%b4%ed%84%b0%ec%85%8b%ec%9c%bc%eb%a1%9c-%eb%b0%b0%ec%9a%b0%eb%8a%94-%eb%b6%84%eb%a5%98","status":"publish","type":"post","link":"https:\/\/secondlife.lol\/zh\/r-%eb%8d%b0%ec%9d%b4%ed%84%b0%eb%b6%84%ec%84%9d-%ec%98%88%ec%a0%9c-%eb%b6%93%ea%bd%83-iris-%eb%8d%b0%ec%9d%b4%ed%84%b0%ec%85%8b%ec%9c%bc%eb%a1%9c-%eb%b0%b0%ec%9a%b0%eb%8a%94-%eb%b6%84%eb%a5%98\/","title":{"rendered":"R \u6570\u636e\u5206\u6790\u793a\u4f8b\uff1a\u5229\u7528 Iris \u8679\u819c\u6570\u636e\u96c6\u5b66\u4e60\u5206\u7c7b\u548c\u53ef\u89c6\u5316"},"content":{"rendered":"<p class=\"wp-block-paragraph\">\u5f53\u60a8\u5f00\u59cb\u5206\u6790\u6570\u636e\u65f6\uff0c\u6700\u5148\u63a5\u89e6\u5230\u7684\u6570\u636e\u96c6\u4e4b\u4e00\u5c31\u662f\u8679\u819c\u6570\u636e\u3002 <a href=\"https:\/\/www.google.com\/url?sa=t&amp;source=web&amp;rct=j&amp;opi=89978449&amp;url=https:\/\/www.kaggle.com\/datasets\/uciml\/iris&amp;ved=2ahUKEwjevYa3xOyIAxXzffUHHaSBGt8QFnoECD4QAQ&amp;usg=AOvVaw3UnPiUFbtR1WBkMC0ssiGi\" data-type=\"link\" data-id=\"https:\/\/www.google.com\/url?sa=t&amp;source=web&amp;rct=j&amp;opi=89978449&amp;url=https:\/\/www.kaggle.com\/datasets\/uciml\/iris&amp;ved=2ahUKEwjevYa3xOyIAxXzffUHHaSBGt8QFnoECD4QAQ&amp;usg=AOvVaw3UnPiUFbtR1WBkMC0ssiGi\" target=\"_blank\" rel=\"noopener\">\u8679\u819c\u6570\u636e\u96c6<\/a>\u8be5\u6570\u636e\u96c6\u662f\u4e00\u4e2a\u7ecf\u5178\u7684 R \u6570\u636e\u5206\u6790\u793a\u4f8b\uff0c\u901a\u5e38\u7528\u4e8e\u5b66\u4e60\u6570\u636e\u5206\u6790\u7684\u57fa\u7840\u77e5\u8bc6\u3002\u5b83\u8981\u89e3\u51b3\u7684\u95ee\u9898\u662f\u6839\u636e\u9e22\u5c3e\u82b1\u7684\u51e0\u4e2a\u7279\u5f81\uff08\u82b1\u74e3\u548c\u843c\u7247\u7684\u957f\u5ea6\u548c\u5bbd\u5ea6\uff09\u5bf9\u6bcf\u4e2a\u6837\u672c\u6240\u5c5e\u7684\u54c1\u79cd\u8fdb\u884c\u5206\u7c7b\u3002<\/p>\n\n\n<style>.kb-image2785_23533e-f8 .kb-image-has-overlay:after{opacity:0.3;border-top-left-radius:5px;border-top-right-radius:5px;border-bottom-right-radius:5px;border-bottom-left-radius:5px;}.kb-image2785_23533e-f8 img.kb-img, .kb-image2785_23533e-f8 .kb-img img{border-top-left-radius:5px;border-top-right-radius:5px;border-bottom-right-radius:5px;border-bottom-left-radius:5px;box-shadow:0px 0px 14px 0px rgba(0, 0, 0, 0.2);}<\/style>\n<div class=\"wp-block-kadence-image kb-image2785_23533e-f8\"><figure class=\"aligncenter size-medium_large\"><img decoding=\"async\" width=\"768\" height=\"576\" src=\"https:\/\/secondlife.lol\/wp-content\/uploads\/2024\/10\/image-1-7-768x576.jpg\" alt=\"(R \ub370\uc774\ud130\ubd84\uc11d \uc608\uc81c - \ubd93\uaf43 Iris \ub370\uc774\ud130\uc14b \" class=\"kb-img wp-image-2941\" srcset=\"https:\/\/secondlife.lol\/wp-content\/uploads\/2024\/10\/image-1-7-768x576.jpg 768w, https:\/\/secondlife.lol\/wp-content\/uploads\/2024\/10\/image-1-7-300x225.jpg 300w, https:\/\/secondlife.lol\/wp-content\/uploads\/2024\/10\/image-1-7-600x450.jpg 600w, https:\/\/secondlife.lol\/wp-content\/uploads\/2024\/10\/image-1-7.jpg 1200w\" sizes=\"(max-width: 768px) 100vw, 768px\" \/><figcaption>( R \u6570\u636e\u5206\u6790\u793a\u4f8b - \u8679\u819c\u6570\u636e\u96c6 )<\/figcaption><\/figure><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">\u5728\u672c\u6587\u7ae0\u4e2d\uff0c\u60a8\u5c06\u5b66\u4e60\u5982\u4f55\u4f7f\u7528 Iris \u6570\u636e\u96c6\u4f5c\u4e3a R \u6570\u636e\u5206\u6790\u793a\u4f8b\u6765\u63a2\u7d22\u548c\u53ef\u89c6\u5316\u6570\u636e\uff0c\u5e76\u521b\u5efa\u4e00\u4e2a\u7b80\u5355\u7684\u5206\u7c7b\u6a21\u578b\u3002 \u7ee7\u7eed\u9605\u8bfb\uff0c\u4e86\u89e3\u6709\u5173\u5206\u7c7b\u548c\u53ef\u89c6\u5316\u7684\u91cd\u8981\u4fe1\u606f\uff01<\/p>\n\n\n<style>.kb-table-of-content-nav.kb-table-of-content-id83_5f28a6-34 .kb-table-of-content-wrap{padding-top:var(--global-kb-spacing-sm, 1.5rem);padding-right:var(--global-kb-spacing-sm, 1.5rem);padding-bottom:var(--global-kb-spacing-sm, 1.5rem);padding-left:var(--global-kb-spacing-sm, 1.5rem);border-top:3px solid var(--global-palette2, #2B6CB0);border-right:3px solid var(--global-palette2, #2B6CB0);border-bottom:3px solid var(--global-palette2, #2B6CB0);border-left:3px solid var(--global-palette2, #2B6CB0);border-top-left-radius:5px;border-top-right-radius:5px;border-bottom-right-radius:5px;border-bottom-left-radius:5px;box-shadow:0px 0px 14px 0px rgba(0, 0, 0, 0.2);}.kb-table-of-content-nav.kb-table-of-content-id83_5f28a6-34 .kb-table-of-contents-title-wrap{padding-top:0px;padding-right:0px;padding-bottom:0px;padding-left:0px;}.kb-table-of-content-nav.kb-table-of-content-id83_5f28a6-34 .kb-table-of-contents-title-wrap{color:var(--global-palette2, #2B6CB0);}.kb-table-of-content-nav.kb-table-of-content-id83_5f28a6-34 .kb-table-of-contents-title{color:var(--global-palette2, #2B6CB0);font-size:28px;font-weight:regular;font-style:normal;}.kb-table-of-content-nav.kb-table-of-content-id83_5f28a6-34 .kb-table-of-content-wrap .kb-table-of-content-list{color:var(--global-palette1, #3182CE);line-height:2em;font-weight:regular;font-style:normal;margin-top:var(--global-kb-spacing-sm, 1.5rem);margin-right:0px;margin-bottom:0px;margin-left:0px;}.kb-table-of-content-nav.kb-table-of-content-id83_5f28a6-34 .kb-table-of-content-wrap .kb-table-of-content-list .kb-table-of-contents__entry:hover{color:var(--global-palette6, #718096);}@media all and (max-width: 1024px){.kb-table-of-content-nav.kb-table-of-content-id83_5f28a6-34 .kb-table-of-content-wrap{border-top:3px solid var(--global-palette2, #2B6CB0);border-right:3px solid var(--global-palette2, #2B6CB0);border-bottom:3px solid var(--global-palette2, #2B6CB0);border-left:3px solid var(--global-palette2, #2B6CB0);}}@media all and (max-width: 1024px){.kb-table-of-content-nav.kb-table-of-content-id83_5f28a6-34 .kb-table-of-contents-title{font-size:28px;}}@media all and (max-width: 767px){.kb-table-of-content-nav.kb-table-of-content-id83_5f28a6-34 .kb-table-of-content-wrap{border-top:3px solid var(--global-palette2, #2B6CB0);border-right:3px solid var(--global-palette2, #2B6CB0);border-bottom:3px solid var(--global-palette2, #2B6CB0);border-left:3px solid var(--global-palette2, #2B6CB0);}.kb-table-of-content-nav.kb-table-of-content-id83_5f28a6-34 .kb-table-of-contents-title{font-size:28px;}}<\/style>\n\n\n<h2 class=\"wp-block-heading\">\u8679\u819c\u6570\u636e\u96c6\u6982\u89c8<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u8679\u819c\u6570\u636e\u96c6<\/strong>\u8be5\u6570\u636e\u96c6\u5305\u542b\u6709\u5173\u9e22\u5c3e\u82b1\u5f62\u6001\u7684\u4fe1\u606f\uff0c\u6709\u52a9\u4e8e\u89e3\u51b3\u4ece\u6570\u636e\u4e2d\u9884\u6d4b\u9e22\u5c3e\u82b1\u54c1\u79cd\u7684\u95ee\u9898\u3002\u6570\u636e\u96c6\u7531 150 \u4e2a\u6837\u672c\u7ec4\u6210\uff0c\u6bcf\u4e2a\u6837\u672c\u6709\u56db\u4e2a\u7279\u5f81\uff08\u843c\u7247\u957f\u5ea6\u3001\u843c\u7247\u5bbd\u5ea6\u3001\u82b1\u74e3\u957f\u5ea6\u548c\u82b1\u74e3\u5bbd\u5ea6\uff09\u3002\u5176\u4e2d <strong>\u6570\u636e\u5206\u6790\u793a\u4f8b<\/strong>\u6211\u4eec\u5c06\u4e86\u89e3\u5982\u4f55\u6839\u636e\u8fd9\u4e9b\u7279\u5f81\u5bf9\u4e09\u4e2a\u9e22\u5c3e\u54c1\u79cd\uff08Setosa\u3001Versicolor \u548c Virginica\uff09\u8fdb\u884c\u5206\u7c7b\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u52a0\u8f7d\u548c\u63a2\u7d22\u6570\u636e<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u8ba9\u6211\u4eec\u4ece\u4f7f\u7528 R \u5bfc\u5165 Iris \u6570\u636e\u5f00\u59cb\uff0c\u8fdb\u884c\u4e00\u4e9b\u63a2\u7d22\u3002 <code>\u9a6c\u5170\u82b1<\/code> \u6570\u636e\u96c6\u662f\u5185\u7f6e\u7684\uff0c\u56e0\u6b64\u65e0\u9700\u5b89\u88c5\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u4ece R \u4e2d\u52a0\u8f7d\u6570\u636e<\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>\u5bfc\u5165 # \u8679\u819c\u6570\u636e\u96c6\ndata(iris)\n\n\u68c0\u67e5 # \u6570\u636e\u7ed3\u6784\nstr(iris)\nsummary(iris)\nhead(iris)<\/code><\/pre>\n\n\n<style>.kb-image2785_344203-f1 .kb-image-has-overlay:after{opacity:0.3;}<\/style>\n<figure class=\"wp-block-kadence-image kb-image2785_344203-f1 size-large\"><img decoding=\"async\" width=\"600\" height=\"176\" src=\"https:\/\/secondlife.lol\/wp-content\/uploads\/2024\/10\/Screenshot_20241001-1546052-600x176.jpg\" alt=\"R \ub370\uc774\ud130\ubd84\uc11d \uc608\uc81c - iris \ub370\uc774\ud130 \ud0d0\uc0c91\" class=\"kb-img wp-image-2791\" srcset=\"https:\/\/secondlife.lol\/wp-content\/uploads\/2024\/10\/Screenshot_20241001-1546052-600x176.jpg 600w, https:\/\/secondlife.lol\/wp-content\/uploads\/2024\/10\/Screenshot_20241001-1546052-300x88.jpg 300w, https:\/\/secondlife.lol\/wp-content\/uploads\/2024\/10\/Screenshot_20241001-1546052-768x225.jpg 768w, https:\/\/secondlife.lol\/wp-content\/uploads\/2024\/10\/Screenshot_20241001-1546052.jpg 812w\" sizes=\"(max-width: 600px) 100vw, 600px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\"><code>\u9a6c\u5170\u82b1<\/code> \u6570\u636e\u96c6\u5206\u4e3a\u4e94\u5217\uff0c\u6bcf\u5217\u5305\u542b\u4ee5\u4e0b\u53d8\u91cf<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>\u843c\u7247\u957f\u5ea6<\/code>\uff1a\u82b1\u843c\u957f\u5ea6<\/li>\n\n\n\n<li><code>\u843c\u7247\u5bbd\u5ea6<\/code>\u82b1\u843c\u5bbd\u5ea6<\/li>\n\n\n\n<li><code>\u82b1\u74e3.\u957f\u5ea6<\/code>\u82b1\u74e3\u957f\u5ea6<\/li>\n\n\n\n<li><code>\u82b1\u74e3\u5bbd\u5ea6<\/code>\u82b1\u74e3\u5bbd\u5ea6<\/li>\n\n\n\n<li><code>\u7269\u79cd<\/code>\u9e22\u5c3e\u82b1\uff1a\u54c1\u79cd\uff08Setosa\u3001Versicolor\u3001Virginica\uff09<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">\u6570\u636e\u7ed3\u6784\u8bf4\u660e<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u4e0a\u9762\u7684\u4ee3\u7801\u5141\u8bb8\u60a8\u521b\u5efa\u4e00\u4e2a <code>\u9a6c\u5170\u82b1<\/code> \u60a8\u53ef\u4ee5\u67e5\u770b\u6570\u636e\u7ed3\u6784\u5e76\u63a2\u7d22\u6c47\u603b\u7edf\u8ba1\u6570\u636e\u3002 \u5bf9\u4e8e\u6bcf\u4e2a\u5c5e\u6027\uff0c\u60a8\u90fd\u53ef\u4ee5\u67e5\u770b\u5e73\u5747\u503c\u3001\u4e2d\u4f4d\u6570\u3001\u6700\u5c0f\u503c\u548c\u6700\u5927\u503c\u7b49\u57fa\u672c\u7edf\u8ba1\u6570\u636e\uff0c\u4ece\u800c\u4e86\u89e3\u6570\u636e\u7684\u603b\u4f53\u5206\u5e03\u60c5\u51b5\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">R \u6570\u636e\u5206\u6790\u793a\u4f8b \u6570\u636e\u53ef\u89c6\u5316<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u63a2\u7d22\u5b8c\u6570\u636e\u540e\uff0c\u91cd\u8981\u7684\u662f\u5c06\u5176\u53ef\u89c6\u5316\uff0c\u4ee5\u4fbf\u76f4\u89c2\u5730\u4e86\u89e3\u6bcf\u4e2a\u5c5e\u6027\u4e4b\u95f4\u7684\u5173\u7cfb\u3002R \u7684 <strong>ggplot2<\/strong> \u8f6f\u4ef6\u5305\u4f7f\u53ef\u89c6\u5316\u64cd\u4f5c\u53d8\u5f97\u7b80\u5355\u3002\u5728\u6b64 <strong>\u6570\u636e\u5206\u6790\u793a\u4f8b<\/strong>\u6211\u4eec\u5c06\u7528\u6563\u70b9\u56fe\u6765\u8868\u793a\u82b1\u74e3\u548c\u843c\u7247\u7684\u957f\u5ea6\u548c\u5bbd\u5ea6\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u7528 R \u7ed8\u5236\u6563\u70b9\u56fe<\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code># \u5b89\u88c5\u5e76\u52a0\u8f7d ggplot2\n# install.packages(\"ggplot2\") #ggplot2 \u5982\u679c\u8f6f\u4ef6\u5305\u672a\u5b89\u88c5\uff0c\u8bf7\u5b89\u88c5\u3002\nlibrary(ggplot2)\n\n# \u53ef\u89c6\u5316\u82b1\u74e3\u548c\u843c\u7247\u7684\u957f\u5ea6\u548c\u5bbd\u5ea6\nggplot(iris, aes(x = Petal.Length, y = Petal.Width, color = Species)) +\n  geom_point(size = 3) +\n  labs(title = \"\u6309\u82b1\u74e3\u957f\u5ea6\u548c\u5bbd\u5ea6\u5212\u5206\u7684\u54c1\u79cd\u5206\u5e03\", x = \"\u82b1\u74e3\u957f\u5ea6\", y = \"\u82b1\u74e3\u5bbd\u5ea6\")<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u8fd0\u884c\u8be5\u4ee3\u7801\u540e\uff0c\u60a8\u5c06\u770b\u5230\u4e00\u4e2a\u6563\u70b9\u56fe\uff0c\u8be5\u56fe\u6839\u636e\u82b1\u74e3\u7684\u957f\u5ea6\u548c\u5bbd\u5ea6\u76f4\u89c2\u5730\u663e\u793a\u4e86\u9e22\u5c3e\u82b1\u54c1\u79cd\u7684\u5206\u5e03\u60c5\u51b5\u3002\u6211\u4eec\u7ed9\u4e0d\u540c\u7684\u54c1\u79cd\u6d82\u4e0a\u4e86\u4e0d\u540c\u7684\u989c\u8272\uff0c\u8fd9\u6837\u4f60\u5c31\u80fd\u4e00\u76ee\u4e86\u7136\u5730\u770b\u5230\u6570\u636e\u7684\u5206\u5e03\u60c5\u51b5\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5728\u8fd9\u4e2a\u53ef\u89c6\u5316\u56fe\u4e2d\uff0c\u60a8\u53ef\u4ee5\u770b\u5230 Setosa \u4e0e\u5176\u4ed6\u4e24\u4e2a\u54c1\u79cd\u660e\u663e\u5206\u5f00\uff0c\u800c Versicolor \u548c Virginica \u6709\u4e00\u4e9b\u91cd\u53e0\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u5efa\u7acb K-NN \u5206\u7c7b\u6a21\u578b<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u73b0\u5728\u6dfb\u52a0\u4e00\u4e2a\u7b80\u5355\u7684 <strong>\u5206\u7c7b\u6a21\u5f0f<\/strong>\u8fd9\u6b21\uff0c\u6211\u4eec\u5c06\u4f7f\u7528 K \u8fd1\u90bb\uff08K-NN\uff09\u7b97\u6cd5\u6765\u9884\u6d4b\u8679\u819c\u7684\u79cd\u7c7b\u3002 K-NN \u662f\u4e00\u79cd\u7b80\u5355\u76f4\u89c2\u7684\u7b97\u6cd5\uff0c\u5728\u7ed9\u5b9a\u4e00\u4e2a\u65b0\u6570\u636e\u70b9\u65f6\uff0c\u4f1a\u53c2\u8003\u5176 K \u4e2a\u8fd1\u90bb\u7684\u6570\u636e\u5bf9\u5176\u8fdb\u884c\u5206\u7c7b\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u5728 R \u4e2d\u6784\u5efa K-NN \u6a21\u578b<\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>\u5b89\u88c5\u5e76\u52a0\u8f7d # \u5148\u51b3\u6761\u4ef6\u8f6f\u4ef6\u5305\ninstall.packages(\"class\")\n\u7c7b\u5e93\n\n\u5c06 # \u6570\u636e\u96c6\u62c6\u5206\u4e3a\u8bad\u7ec3\u96c6\u548c\u6d4b\u8bd5\u96c6\nset.seed(123)\nindex &lt;- sample(1:nrow(iris), 0.7 * nrow(iris))\ntrain_data &lt;- iris[index, ]\ntest_data &lt;- iris[-index, ]\n\n\u8bad\u7ec3\u548c\u9884\u6d4b # K-NN \u6a21\u578b\ntrain_labels &lt;- train_data$Species\ntest_labels &lt;- test_data$Species\nknn_pred &lt;- knn(train = train_data[, -5], test = test_data[, -5], cl = train_labels, k = 3)\n\n\u68c0\u67e5 # \u9884\u6d4b\u7ed3\u679c\ntable(knn_pred, test_labels)\n\n# \u6267\u884c\u7ed3\u679c\u6570\u636e #\n            \u6d4b\u8bd5\u6807\u7b7e\nknn_pred setosa versicolor virginica\n  setosa 14 0 0\n  versicolor 0 17 0\n  virginica 0 1 13<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u4e0a\u8ff0\u4ee3\u7801\u76f8\u5f53\u4e8e <strong>K-NN \u7b97\u6cd5<\/strong>\u6765\u9884\u6d4b\u8679\u819c\u6570\u636e\u96c6\u4e2d\u7684\u8679\u819c\u54c1\u79cd\u3002\u5c06\u8bad\u7ec3\u6570\u636e\u548c\u6d4b\u8bd5\u6570\u636e\u5206\u5f00\u540e\uff0c\u5b83\u5bf9\u6d4b\u8bd5\u6570\u636e\u8fdb\u884c\u54c1\u79cd\u9884\u6d4b\uff0c\u5e76\u5c06\u7ed3\u679c\u4e0e\u5b9e\u9645\u503c\u8fdb\u884c\u6bd4\u8f83\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u8bc4\u4f30\u9884\u6d4b\u7ed3\u679c<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u8bc4\u4f30\u9884\u6d4b\u7ed3\u679c\u7684\u4e00\u79cd\u65b9\u6cd5\u662f\u4f7f\u7528 <strong>\u6df7\u6dc6\u77e9\u9635<\/strong>\u901a\u8fc7\u6df7\u6dc6\u77e9\u9635\uff0c\u60a8\u53ef\u4ee5\u4e00\u76ee\u4e86\u7136\u5730\u770b\u5230\u6a21\u578b\u9884\u6d4b\u7684\u51c6\u786e\u5ea6\uff0c\u4ee5\u53ca\u6709\u591a\u5c11\u6837\u672c\u88ab\u9519\u8bef\u5206\u7c7b\u3002\u5728\u4e0a\u9762\u7684\u4ee3\u7801\u4e2d <code>\u8868\u683c()<\/code> \u51fd\u6570\u6765\u6bd4\u8f83\u9884\u6d4b\u503c\u548c\u5b9e\u9645\u503c\uff0c\u53ef\u4ee5\u8f93\u51fa\u6df7\u6dc6\u77e9\u9635\uff0c\u4f46\u5f88\u96be\u7acb\u5373\u5206\u6790\u5176\u542b\u4e49\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u56e0\u6b64\uff0c\u5728\u8bc4\u4f30 K-NN \u5206\u7c7b\u6a21\u578b\u7684\u6027\u80fd\u65f6\uff0c\u6211\u4eec\u901a\u5e38\u4f7f\u7528 <strong>\u7cbe\u786e\u5ea6<\/strong>, <strong>\u56de\u987e<\/strong>, <strong>F1 \u5206\u6570<\/strong> \u6765\u5177\u4f53\u5206\u6790\u6a21\u578b\u7684\u6027\u80fd\u3002 <\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><code>\u86e9<\/code> \u5305\u6216 <code>e1071<\/code> \u8f6f\u4ef6\u5305\u53ef\u4ee5\u8f7b\u677e\u8ba1\u7b97\u7cbe\u786e\u5ea6\u3001\u53ec\u56de\u7387\u548c F1 \u5206\u6570\u3002\u5728\u8fd9\u91cc\uff0c\u6211\u4eec\u5c06\u4f7f\u7528 <code>\u86e9<\/code> \u6211\u4eec\u5c06\u4ecb\u7ecd\u5982\u4f55\u4f7f\u7528\u8f6f\u4ef6\u5305\u6765\u83b7\u53d6\u5b83\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">1. \u5b89\u88c5\u5e76\u52a0\u8f7d Caret \u8f6f\u4ef6\u5305<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">\u9996\u5148\uff0c\u521b\u5efa\u4e00\u4e2a <code>\u86e9<\/code> \u8ba9\u6211\u4eec\u5b89\u88c5\u5e76\u52a0\u8f7d\u8f6f\u4ef6\u5305\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code># \u6839\u636e\u9700\u8981\u5b89\u88c5\u8f6f\u4ef6\u5305\n# install.packages(\"caret\")\n\nlibrary(caret)<\/code><\/pre>\n\n\n\n<h4 class=\"wp-block-heading\">2. \u751f\u6210\u6df7\u6dc6\u77e9\u9635\u5e76\u8bc4\u4f30\u6027\u80fd<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\"><code>\u8868\u683c()<\/code> \u529f\u80fd\uff0c\u4f7f\u7528\u81ea\u5df1\u521b\u5efa\u7684\u6df7\u6dc6\u77e9\u9635\u6765\u8bc4\u4f30\u6027\u80fd\uff0c\u4f46 <code>\u86e9<\/code> \u8f6f\u4ef6\u5305\u7684 <code>\u6df7\u6dc6\u77e9\u9635()<\/code> \u901a\u8fc7\u5404\u79cd\u529f\u80fd\uff0c\u60a8\u53ef\u4ee5\u81ea\u52a8\u8ba1\u7b97\u7cbe\u786e\u5ea6\u3001\u53ec\u56de\u7387\u3001F1 \u5206\u6570\u7b49\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\u751f\u6210 # \u6df7\u6dc6\u77e9\u9635\u5e76\u8bc4\u4f30\u5176\u6027\u80fd\nconfusion_matrix &lt;- confusionMatrix(knn_pred, test_labels)\n\n\u6253\u5370 # \u7ed3\u679c\nprint(confusion_matrix)<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u8fd0\u884c\u8fd9\u6bb5\u4ee3\u7801\u65f6\uff0c\u60a8\u4f1a\u770b\u5230\u6bcf\u4e2a\u7c7b\u7684 <strong>\u7cbe\u786e\u5ea6<\/strong>, <strong>\u91cd\u73b0\u6027<\/strong>, <strong>F1 \u5206\u6570<\/strong>\u4ee5\u53ca <strong>\u51c6\u786e\u6027<\/strong>\u5230\u6700\u540e\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">3. \u89e3\u91ca\u7ed3\u679c<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\"><code>\u6df7\u6dc6\u77e9\u9635()<\/code> \u51fd\u6570\u8fd4\u56de\u4e00\u4e2a\u5305\u542b\u5404\u79cd\u6027\u80fd\u6307\u6807\u7684\u7ed3\u679c\u3002\u6211\u4eec\u5c06\u5728\u6b64\u4ecb\u7ecd\u4e3b\u8981\u6307\u6807\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u7cbe\u786e\u5ea6<\/strong>\u5728\u67d0\u4e00\u7c7b\u522b\u7684\u9884\u6d4b\u503c\u4e2d\uff0c\u5b9e\u9645\u5c5e\u4e8e\u8be5\u7c7b\u522b\u7684\u6570\u636e\u6bd4\u4f8b\u3002<\/li>\n\n\n\n<li><strong>\u56de\u987e<\/strong>\u662f\u6b63\u786e\u9884\u6d4b\u7684\u5b9e\u9645\u5c5e\u4e8e\u8be5\u7c7b\u7684\u6570\u636e\u7684\u767e\u5206\u6bd4\u3002<\/li>\n\n\n\n<li><strong>F1 \u5206\u6570<\/strong>\u7cbe\u786e\u5ea6\u548c\u53ec\u56de\u7387\u7684\u8c03\u548c\u5e73\u5747\u503c\uff0c\u53ef\u5bf9\u8fd9\u4e24\u4e2a\u503c\u8fdb\u884c\u5747\u8861\u8bc4\u4f30\u3002<\/li>\n\n\n\n<li><strong>\u51c6\u786e\u6027<\/strong>\uff1a\u9884\u6d4b\u6b63\u786e\u7684\u6570\u636e\u5360\u603b\u6570\u636e\u7684\u767e\u5206\u6bd4\u3002<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\">4. \u793a\u4f8b\u7ed3\u679c<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\"><code>\u6df7\u6dc6\u77e9\u9635()<\/code> \u51fd\u6570\u7684\u7ed3\u679c\u5927\u81f4\u5982\u4e0b<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\u6df7\u6dc6\u77e9\u9635\u548c\u7edf\u8ba1\n\n            \u53c2\u8003\u6587\u732e\n\u9884\u62a5 setosa versicolor virginica\n  setosa 14 0 0\n  versicolor 0 17 0\n  virginica 0 1 13\n\n\u603b\u4f53\u7edf\u8ba1\n\n               \u7cbe\u786e\u5ea6 : 0.9778\n                 95% ci : (0.8887, 0.9994)\n    \u65e0\u4fe1\u606f\u7387 : 0.3556\n    P-Value [Acc &gt; NIR] : &lt; 2e-16\n\n                  \u5361\u5e15\u503c : 0.9662\n\n\u9ea6\u514b\u5c3c\u739b\u68c0\u9a8c P \u503c : NA\n\n\u73ed\u7ea7\u7edf\u8ba1\n\n                     \u7b49\u7ea7\uff1asetosa \u7b49\u7ea7\uff1aversicolor \u7b49\u7ea7\uff1avirginica\n\u7075\u654f\u5ea6 1.0000 0.9444 1.0000\n\u7279\u5f02\u6027 1.0000 1.0000 0.9722\n\u6b63\u9884\u6d4b\u503c 1.0000 1.0000 0.9286\n\u9634\u6027\u9884\u6d4b\u503c 1.0000 0.9667 1.0000\n\u6d41\u884c\u7387 0.2889 0.3556 0.3556\n\u68c0\u6d4b\u7387 0.2889 0.3333 0.3556\n\u68c0\u6d4b\u6d41\u884c\u7387 0.2889 0.3333 0.3833\n\u5e73\u8861\u7cbe\u5ea6 1.0000 0.9722 0.9861<\/code><\/pre>\n\n\n\n<h5 class=\"wp-block-heading\">\u6bcf\u4e2a\u5173\u952e\u6307\u6807\u7684\u89e3\u91ca\uff1a<\/h5>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u654f\u611f\u6027<\/strong>\u53ec\u56de\u7387\u3002\u8868\u793a\u9884\u6d4b\u503c\u4e0e\u5b9e\u9645\u503c\u7684\u5339\u914d\u7a0b\u5ea6\u3002<\/li>\n\n\n\n<li><strong>\u7279\u5f02\u6027<\/strong>\u662f\u5bf9\u6570\u636e\u9884\u6d4b\u6548\u679c\u7684\u8861\u91cf\u6807\u51c6\uff0c\u800c\u4e0d\u662f\u5bf9\u5177\u4f53\u7c7b\u522b\u7684\u8861\u91cf\u6807\u51c6\u3002<\/li>\n\n\n\n<li><strong>Pos Pred Value<\/strong>\u7cbe\u5ea6\uff0c\u5373\u9884\u6d4b\u6b63\u786e\u7387\u3002<\/li>\n\n\n\n<li><strong>\u8d1f\u9884\u6d4b\u503c<\/strong>\u6307\u6b63\u786e\u9884\u6d4b\u4e2d\u672a\u9884\u6d4b\u5230\u7684\u6bd4\u4f8b\u3002<\/li>\n\n\n\n<li><strong>\u51c6\u786e\u6027<\/strong>\u9884\u6d4b\u6b63\u786e\u7387\uff1a\u9884\u6d4b\u6b63\u786e\u7387\u5360\u9884\u6d4b\u603b\u6570\u7684\u767e\u5206\u6bd4\u3002<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">\u8fd9\u6837\uff0c\u60a8\u5c31\u53ef\u4ee5\u66f4\u5177\u4f53\u5730\u8bc4\u4f30\u548c\u5206\u6790\u6a21\u578b\u7684\u6027\u80fd\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u6570\u636e\u5206\u6790\u4e2d\u7684\u5e38\u89c1\u9519\u8bef\u53ca\u7ea0\u6b63\u65b9\u6cd5<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u8fd9\u4e00\u6b21 <strong>\u6570\u636e\u5206\u6790\u793a\u4f8b<\/strong>\u4ee5\u4e0b\u662f\u4e00\u4e9b\u907f\u514d\u521d\u5b66\u8005\u5e38\u89c1\u9519\u8bef\u7684\u63d0\u793a\u3002<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u5ffd\u89c6\u6570\u636e\u9884\u5904\u7406<\/strong>:\u5728\u5206\u6790\u6570\u636e\u4e4b\u524d\uff0c\u5fc5\u987b\u5904\u7406\u7f3a\u5931\u503c\u3001\u5f02\u5e38\u503c\u7b49\u3002\u8679\u819c\u6570\u636e\u6ca1\u6709\u7f3a\u5931\u503c\uff0c\u4f46\u5176\u4ed6\u6570\u636e\u96c6\u5fc5\u987b\u8fdb\u884c\u9884\u5904\u7406\u3002<\/li>\n\n\n\n<li><strong>\u9009\u62e9\u9002\u5f53\u7684 K \u503c<\/strong>\u5728 K-NN \u6a21\u578b\u4e2d <code>k<\/code> \u9009\u62e9\u4e00\u4e2a\u5408\u9002\u7684\u503c\u975e\u5e38\u91cd\u8981\u3002K \u503c\u8fc7\u5c0f\u4f1a\u5bfc\u81f4\u8fc7\u5ea6\u62df\u5408\uff0c\u800c K \u503c\u8fc7\u5927\u5219\u4f1a\u9057\u6f0f\u91cd\u8981\u7684\u6a21\u5f0f\u3002<\/li>\n\n\n\n<li><strong>\u4e0d\u91cd\u89c6\u6570\u636e\u5206\u533a<\/strong>\u6ce8\u610f\uff1a\u5728\u5212\u5206\u8bad\u7ec3\u6570\u636e\u548c\u6d4b\u8bd5\u6570\u636e\u65f6\uff0c\u786e\u4fdd\u968f\u673a\u62bd\u6837\uff0c\u5426\u5219\u6a21\u578b\u53ef\u80fd\u4f1a\u504f\u5411\u67d0\u4e9b\u6570\u636e\u3002<\/li>\n<\/ol>\n\n\n\n<h2 class=\"wp-block-heading\">\u5e38\u89c1\u95ee\u9898<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u95ee\u9898 1\uff1a\u5728\u54ea\u91cc\u53ef\u4ee5\u4e0b\u8f7d\u8679\u819c\u6570\u636e\u96c6\uff1f<\/strong><br>\u7b54\uff1aR \u9ed8\u8ba4\u5185\u7f6e\u4e86\u8679\u819c\u6570\u636e\u96c6\uff0c\u56e0\u6b64\u60a8\u65e0\u9700\u4e0b\u8f7d\u3002 <code>data(iris)<\/code> \u60a8\u53ef\u4ee5\u7528\u547d\u4ee4\u6765\u8c03\u7528\u5b83\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u95ee\u9898 2\uff1a \u5982\u4f55\u8bbe\u7f6e K-NN \u6a21\u578b\u4e2d\u7684 K \u503c\uff1f<\/strong><br>\u7b54\uff1aK \u503c\u901a\u5e38\u8bbe\u7f6e\u4e3a\u5947\u6570\uff0c\u6211\u4eec\u5efa\u8bae\u4f7f\u7528\u4ea4\u53c9\u9a8c\u8bc1\u6765\u627e\u5230\u6700\u4f73 K \u503c\u3002\u6839\u636e\u6570\u636e\u96c6\u7684\u5927\u5c0f\u548c\u5206\u5e03\u60c5\u51b5\uff0cK \u503c\u53ef\u80fd\u4f1a\u6709\u6240\u4e0d\u540c\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u95ee\u9898 3\uff1a\u6211\u53ef\u4ee5\u5c1d\u8bd5\u5176\u4ed6\u5206\u7c7b\u7b97\u6cd5\u5417\uff1f<\/strong><br>\u7b54\uff1a\u5f53\u7136\uff01\u9664 K-NN \u5916\uff0c\u60a8\u8fd8\u5c06\u4eb2\u8eab\u4f53\u9a8c\u5176\u4ed6\u5404\u79cd\u5206\u7c7b\u7b97\u6cd5\uff0c\u5305\u62ec\u903b\u8f91\u56de\u5f52\u3001\u51b3\u7b56\u6811\u3001\u968f\u673a\u68ee\u6797\u7b49\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u7ec4\u7ec7\u8d77\u6765<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u5728\u672c\u5e16\u4e2d\uff0c\u6211\u4eec\u5c06\u4f7f\u7528 <strong>\u6570\u636e\u5206\u6790\u793a\u4f8b<\/strong>\u867d\u7136 Iris \u6570\u636e\u96c6\u5c0f\u800c\u7b80\u5355\uff0c\u4f46\u5b83\u662f\u5b66\u4e60\u548c\u5206\u6790\u5206\u7c7b\u95ee\u9898\u7684\u975e\u5e38\u6709\u7528\u7684\u8d44\u6e90\u3002 \u6211\u4eec\u5e0c\u671b\u8fd9\u4e2a\u793a\u4f8b\u80fd\u8ba9\u60a8\u4e86\u89e3\u6570\u636e\u5206\u6790\u7684\u57fa\u672c\u6982\u5ff5\uff0c\u5e76\u4e3a\u60a8\u89e3\u51b3\u66f4\u590d\u6742\u7684\u95ee\u9898\u94fa\u5e73\u9053\u8def\u3002 <\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u60a8\u53ef\u4ee5\u5728\u6b64\u793a\u4f8b\u7684\u57fa\u7840\u4e0a\u521b\u5efa\u4e00\u4e2a <a href=\"https:\/\/secondlife.lol\/zh\/data-analysis-example-titanic-survivor-prediction\/\" data-type=\"post\" data-id=\"2765\">\u5176\u4ed6\u6570\u636e\u96c6<\/a>\u7684\u6311\u6218\uff01<\/p>","protected":false},"excerpt":{"rendered":"<p>\u5f53\u60a8\u5f00\u59cb\u5206\u6790\u6570\u636e\u65f6\uff0c\u60a8\u6700\u5148\u63a5\u89e6\u5230\u7684\u6570\u636e\u96c6\u4e4b\u4e00\u662f...<\/p>","protected":false},"author":3,"featured_media":2943,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_kad_blocks_custom_css":"","_kad_blocks_head_custom_js":"","_kad_blocks_body_custom_js":"","_kad_blocks_footer_custom_js":"","_kad_post_transparent":"","_kad_post_title":"","_kad_post_layout":"","_kad_post_sidebar_id":"","_kad_post_content_style":"","_kad_post_vertical_padding":"","_kad_post_feature":"","_kad_post_feature_position":"","_kad_post_header":false,"_kad_post_footer":false,"_kad_post_classname":"","footnotes":""},"categories":[6],"tags":[324,325,174,39,164],"class_list":["post-2785","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-r-coding","tag-iris-","tag-r--","tag-r-","tag-rstudio","tag-164"],"taxonomy_info":{"category":[{"value":6,"label":"\uc54c(R)"}],"post_tag":[{"value":324,"label":"iris 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