{"id":915,"date":"2023-07-28T07:59:26","date_gmt":"2023-07-28T07:59:26","guid":{"rendered":"https:\/\/statorials.org\/ko\/%e1%84%86%e1%85%a1%e1%84%92%e1%85%a1%e1%86%af%e1%84%85%e1%85%a1%e1%84%82%e1%85%a9%e1%84%87%e1%85%b5%e1%84%89%e1%85%b3-%e1%84%80%e1%85%a5%e1%84%85%e1%85%b5-r\/"},"modified":"2023-07-28T07:59:26","modified_gmt":"2023-07-28T07:59:26","slug":"%e1%84%86%e1%85%a1%e1%84%92%e1%85%a1%e1%86%af%e1%84%85%e1%85%a1%e1%84%82%e1%85%a9%e1%84%87%e1%85%b5%e1%84%89%e1%85%b3-%e1%84%80%e1%85%a5%e1%84%85%e1%85%b5-r","status":"publish","type":"post","link":"https:\/\/statorials.org\/ko\/%e1%84%86%e1%85%a1%e1%84%92%e1%85%a1%e1%86%af%e1%84%85%e1%85%a1%e1%84%82%e1%85%a9%e1%84%87%e1%85%b5%e1%84%89%e1%85%b3-%e1%84%80%e1%85%a5%e1%84%85%e1%85%b5-r\/","title":{"rendered":"R\uc5d0\uc11c mahalanobis \uac70\ub9ac\ub97c \uacc4\uc0b0\ud558\ub294 \ubc29\ubc95"},"content":{"rendered":"<p><\/p>\n<hr>\n<p><span style=\"color: #000000;\"><strong>\ub9c8\ud560\ub77c\ub178\ube44\uc2a4 \uac70\ub9ac\ub294<\/strong> \ub2e4\ubcc0\ub7c9 \uacf5\uac04\uc5d0\uc11c \ub450 \uc810 \uc0ac\uc774\uc758 \uac70\ub9ac\uc785\ub2c8\ub2e4.<\/span><\/p>\n<p> <span style=\"color: #000000;\">\uc774\ub294 \uc5ec\ub7ec \ubcc0\uc218\ub97c \ud3ec\ud568\ud558\ub294 \ud1b5\uacc4 \ubd84\uc11d\uc5d0\uc11c \uc774\uc0c1\uac12\uc744 \ud0d0\uc9c0\ud558\ub294 \ub370 \uc790\uc8fc \uc0ac\uc6a9\ub429\ub2c8\ub2e4.<\/span><\/p>\n<p> <span style=\"color: #000000;\">\uc774 \ud29c\ud1a0\ub9ac\uc5bc\uc5d0\uc11c\ub294 R\uc5d0\uc11c Mahalanobis \uac70\ub9ac\ub97c \uacc4\uc0b0\ud558\ub294 \ubc29\ubc95\uc744 \uc124\uba85\ud569\ub2c8\ub2e4.<\/span><\/p>\n<h2> <span style=\"color: #000000;\"><strong>\uc608: R \ub2e8\uc704\uc758 Mahalanobis \uac70\ub9ac<\/strong><\/span><\/h2>\n<p> <span style=\"color: #000000;\">R\uc758 \ub370\uc774\ud130\uc138\ud2b8\uc5d0 \uc788\ub294 \uac01 <a href=\"https:\/\/statorials.org\/ko\/\u1110\u1169\u11bc\u1100\u1168\u110b\u1166\u1109\u1165\u110b\u1174-\u1100\u116a\u11ab\u110e\u1161\u11af\/\" target=\"_blank\" rel=\"noopener\">\uad00\uce21\uac12<\/a> \uc5d0 \ub300\ud55c Mahalanobis \uac70\ub9ac\ub97c \uacc4\uc0b0\ud558\ub824\uba74 \ub2e4\uc74c \ub2e8\uacc4\ub97c \uc0ac\uc6a9\ud558\uc138\uc694.<\/span><\/p>\n<p> <span style=\"color: #000000;\"><strong>1\ub2e8\uacc4: \ub370\uc774\ud130\uc138\ud2b8\ub97c \ub9cc\ub4ed\ub2c8\ub2e4.<\/strong><\/span><\/p>\n<p> <span style=\"color: #000000;\">\uba3c\uc800, 20\uba85\uc758 \ud559\uc0dd\uc758 \uc2dc\ud5d8 \uc810\uc218\uc640 \ud568\uaed8 \uacf5\ubd80\ud55c \uc2dc\uac04, \uce58\ub978 \uc5f0\uc2b5 \uc2dc\ud5d8 \ud69f\uc218, \ucf54\uc2a4\uc758 \ud604\uc7ac \uc131\uc801\uc744 \ud45c\uc2dc\ud558\ub294 \ub370\uc774\ud130\uc138\ud2b8\ub97c \ub9cc\ub4ed\ub2c8\ub2e4.<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #008080;\">#create data<\/span>\ndf = data.frame(score = c(91, 93, 72, 87, 86, 73, 68, 87, 78, 99, 95, 76, 84, 96, 76, 80, 83, 84, 73, 74) ,\n        hours = c(16, 6, 3, 1, 2, 3, 2, 5, 2, 5, 2, 3, 4, 3, 3, 3, 4, 3, 4, 4),\n        prep = c(3, 4, 0, 3, 4, 0, 1, 2, 1, 2, 3, 3, 3, 2, 2, 2, 3, 3, 2, 2),\n        grade = c(70, 88, 80, 83, 88, 84, 78, 94, 90, 93, 89, 82, 95, 94, 81, 93, 93, 90, 89, 89))\n\n<span style=\"color: #008080;\">#view first six rows of data\n<\/span>head(df)\n\n  score hours prep grade\n1 91 16 3 70\n2 93 6 4 88\n3 72 3 0 80\n4 87 1 3 83\n5 86 2 4 88\n6 73 3 0 84\n<\/strong><\/pre>\n<p> <span style=\"color: #000000;\"><strong>2\ub2e8\uacc4: \uac01 \uad00\uce21\uac12\uc5d0 \ub300\ud55c Mahalanobis \uac70\ub9ac\ub97c \uacc4\uc0b0\ud569\ub2c8\ub2e4.<\/strong><\/span><\/p>\n<p> <span style=\"color: #000000;\">\ub2e4\uc74c\uc73c\ub85c R\uc5d0 \ub0b4\uc7a5\ub41c <a href=\"https:\/\/stat.ethz.ch\/R-manual\/R-devel\/library\/stats\/html\/mahalanobis.html\" target=\"_blank\" rel=\"noopener noreferrer\">mahalanobis()<\/a> \ud568\uc218\ub97c \uc0ac\uc6a9\ud558\uc5ec \ub2e4\uc74c \uad6c\ubb38\uc744 \uc0ac\uc6a9\ud558\uc5ec \uac01 \uad00\uce21\uac12\uc5d0 \ub300\ud55c Mahalanobis \uac70\ub9ac\ub97c \uacc4\uc0b0\ud569\ub2c8\ub2e4.<\/span><\/p>\n<p> <strong><span style=\"color: #000000;\">\ub9c8\ud560\ub77c\ub178\ube44\uc2a4(x, \uc911\uc559, cov)<\/span><\/strong><\/p>\n<p> <span style=\"color: #000000;\">\uae08:<\/span><\/p>\n<ul>\n<li> <span style=\"color: #000000;\"><strong>x:<\/strong> \ub370\uc774\ud130 \ub9e4\ud2b8\ub9ad\uc2a4<\/span><\/li>\n<li> <span style=\"color: #000000;\"><strong>\uc911\uc2ec:<\/strong> \ubd84\ud3ec\uc758 \ud3c9\uade0 \ubca1\ud130<\/span><\/li>\n<li> <span style=\"color: #000000;\"><strong>cov:<\/strong> \ubd84\ud3ec \uacf5\ubd84\uc0b0 \ud589\ub82c<\/span><\/li>\n<\/ul>\n<p> <span style=\"color: #000000;\">\ub2e4\uc74c \ucf54\ub4dc\ub294 \ub370\uc774\ud130 \uc138\ud2b8\uc5d0 \ub300\ud574 \uc774 \ud568\uc218\ub97c \uad6c\ud604\ud558\ub294 \ubc29\ubc95\uc744 \ubcf4\uc5ec\uc90d\ub2c8\ub2e4.<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #008080;\">#calculate Mahalanobis distance for each observation<\/span>\nmahalanobis(df, colMeans(df), cov(df))\n\n [1] 16.5019630 2.6392864 4.8507973 5.2012612 3.8287341 4.0905633\n [7] 4.2836303 2.4198736 1.6519576 5.6578253 3.9658770 2.9350178\n[13] 2.8102109 4.3682945 1.5610165 1.4595069 2.0245748 0.7502536\n[19] 2.7351292 2.2642268\n<\/strong><\/pre>\n<p> <span style=\"color: #000000;\"><strong>3\ub2e8\uacc4: \uac01 Mahalanobis \uac70\ub9ac\uc5d0 \ub300\ud55c p-\uac12\uc744 \uacc4\uc0b0\ud569\ub2c8\ub2e4.<\/strong><\/span> <\/p>\n<div id=\"mv-first-video\" class=\"mv-video-target mv-video__featured mv-video__optimized mv-video__embedded\" data-video-id=\"tmdycgxksxqpmqpu0vbx\" data-autoplay=\"true\" data-automobile=\"true\" data-muted=\"true\" data-sticky=\"true\" data-autoinsert=\"true\" data-disable-jsonld=\"true\" data-video-placement-inited=\"true\">\n<div id=\"mediavine-video__target-div__8330b88d-7ed9-463c-85d3-dc370a4c9ab3\" class=\"mediavine-video__target-div\">\n<div class=\"mediavine-video__root-container\">\n<div class=\"mediavine-video__placement-container mediavine-video__bottom mediavine-video__right mediavine-video__dark-theme\">\n<div class=\"mediavine-video__title-bar\">\n<p> <span style=\"color: #000000;\">\uc77c\ubd80 Mahalanobis \uac70\ub9ac\uac00 \ub2e4\ub978 \uac70\ub9ac\ubcf4\ub2e4 \ud6e8\uc52c \ub354 \ud06c\ub2e4\ub294 \uac83\uc744 \uc54c \uc218 \uc788\uc2b5\ub2c8\ub2e4.<\/span><\/p>\n<p> <span style=\"color: #000000;\">\uac70\ub9ac \uc911 \ud1b5\uacc4\uc801\uc73c\ub85c \uc720\uc758\ubbf8\ud55c \uac83\uc774 \uc788\ub294\uc9c0 \ud655\uc778\ud558\ub824\uba74 \ud574\ub2f9 \uac70\ub9ac\uc758 <a href=\"https:\/\/statorials.org\/ko\/p-\u1100\u1161\u11b9-\u1110\u1169\u11bc\u1100\u1168\u110c\u1165\u11a8-\u110b\u1172\u110b\u1174\u1109\u1165\u11bc\/\" target=\"_blank\" rel=\"noopener\">p-\uac12\uc744<\/a> \uacc4\uc0b0\ud574\uc57c \ud569\ub2c8\ub2e4.<\/span><\/p>\n<p> <span style=\"color: #000000;\">\uac01 \uac70\ub9ac\uc5d0 \ub300\ud55c p-\uac12\uc740 k-1 \uc790\uc720\ub3c4\ub97c \uac16\ub294 Mahalanobis \uac70\ub9ac\uc758 \uce74\uc774\uc81c\uacf1 \ud1b5\uacc4\ub7c9\uc5d0 \ud574\ub2f9\ud558\ub294 p-\uac12\uc73c\ub85c \uacc4\uc0b0\ub429\ub2c8\ub2e4. \uc5ec\uae30\uc11c k = \ubcc0\uc218 \uc218\uc785\ub2c8\ub2e4.<\/span><\/p>\n<p> <span style=\"color: #000000;\">\ub530\ub77c\uc11c \uc774 \uacbd\uc6b0\uc5d0\ub294 4-1 = 3\uc758 \uc790\uc720\ub3c4\ub97c \uc0ac\uc6a9\ud569\ub2c8\ub2e4.<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #008080;\">#create new column in data frame to hold Mahalanobis distances<\/span>\ndf$mahal &lt;- mahalanobis(df, colMeans(df), cov(df))\n\n<span style=\"color: #008080;\">#create new column in data frame to hold p-value for each Mahalanobis distance\n<\/span>df$p &lt;- <span style=\"color: #3366ff;\">pchisq<\/span> (df$mahal, df= <span style=\"color: #339966;\">3<\/span> , lower.tail=FALSE)\n\n<span style=\"color: #008080;\">#view data frame\n<\/span>df\n\n   score hours prep grade mahal p\n1 91 16 3 70 16.5019630 0.0008945642\n2 93 6 4 88 2.6392864 0.4506437265\n3 72 3 0 80 4.8507973 0.1830542407\n4 87 1 3 83 5.2012612 0.1576392526\n5 86 2 4 88 3.8287341 0.2805615121\n6 73 3 0 84 4.0905633 0.2518495222\n7 68 2 1 78 4.2836303 0.2324211504\n8 87 5 2 94 2.4198736 0.4899458807\n9 78 2 1 90 1.6519576 0.6476670033\n10 99 5 2 93 5.6578253 0.1294978092\n11 95 2 3 89 3.9658770 0.2651724541\n12 76 3 3 82 2.9350178 0.4017530495\n13 84 4 3 95 2.8102109 0.4218217836\n14 96 3 2 94 4.3682945 0.2243432904\n15 76 3 2 81 1.5610165 0.6682610031\n16 80 3 2 93 1.4595069 0.6916471506\n17 83 4 3 93 2.0245748 0.5673218169\n18 84 3 3 90 0.7502536 0.8613248635\n19 73 4 2 89 2.7351292 0.4342904353\n20 74 4 2 89 2.2642268 0.5194087143\n<\/strong><\/pre>\n<p> <span style=\"color: #000000;\">\uc77c\ubc18\uc801\uc73c\ub85c p-\uac12\uc774 <strong>0.001\ubcf4\ub2e4 \uc791\uc73c\uba74<\/strong> \uc774\uc0c1\uac12\uc73c\ub85c \uac04\uc8fc\ub429\ub2c8\ub2e4.<\/span><\/p>\n<p> <span style=\"color: #000000;\">\uccab \ubc88\uc9f8 \uad00\uce21\uac12\uc740 p-\uac12\uc774 0.001\ubcf4\ub2e4 \uc791\uae30 \ub54c\ubb38\uc5d0 \ub370\uc774\ud130\uc138\ud2b8\uc5d0\uc11c \uc774\uc0c1\uac12\uc774\ub77c\ub294 \uac83\uc744 \uc54c \uc218 \uc788\uc2b5\ub2c8\ub2e4.<\/span><\/p>\n<p> <span style=\"color: #000000;\">\ubb38\uc81c\uc758 \ub9e5\ub77d\uc5d0 \ub530\ub77c \uc774 \uad00\ucc30\uc740 \uc774\uc0c1\uce58\uc774\uace0 \ubd84\uc11d \uacb0\uacfc\uc5d0 \uc601\ud5a5\uc744 \ubbf8\uce60 \uc218 \uc788\uc73c\ubbc0\ub85c \ub370\uc774\ud130 \uc138\ud2b8\uc5d0\uc11c \uc81c\uac70\ud558\uae30\ub85c \uacb0\uc815\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4.<\/span><\/p>\n<p> <span style=\"color: #000000;\"><span style=\"color: #000000;\"><b>\uad00\ub828 \ud56d\ubaa9:<\/b><\/span> <a href=\"https:\/\/statorials.org\/ko\/\u1103\u1161\u1107\u1167\u11ab\u1105\u1163\u11bc-\u110c\u1165\u11bc\u1100\u1172\u1109\u1165\u11bc-\u1100\u1165\u11b7\u110c\u1165\u11bc-r\/\" target=\"_blank\" rel=\"noopener noreferrer\">R\uc5d0\uc11c \ub2e4\ubcc0\ub7c9 \uc815\uaddc\uc131 \ud14c\uc2a4\ud2b8\ub97c \uc218\ud589\ud558\ub294 \ubc29\ubc95<\/a><\/span><\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>\ub9c8\ud560\ub77c\ub178\ube44\uc2a4 \uac70\ub9ac\ub294 \ub2e4\ubcc0\ub7c9 \uacf5\uac04\uc5d0\uc11c \ub450 \uc810 \uc0ac\uc774\uc758 \uac70\ub9ac\uc785\ub2c8\ub2e4. \uc774\ub294 \uc5ec\ub7ec \ubcc0\uc218\ub97c \ud3ec\ud568\ud558\ub294 \ud1b5\uacc4 \ubd84\uc11d\uc5d0\uc11c \uc774\uc0c1\uac12\uc744 \ud0d0\uc9c0\ud558\ub294 \ub370 \uc790\uc8fc \uc0ac\uc6a9\ub429\ub2c8\ub2e4. \uc774 \ud29c\ud1a0\ub9ac\uc5bc\uc5d0\uc11c\ub294 R\uc5d0\uc11c Mahalanobis \uac70\ub9ac\ub97c \uacc4\uc0b0\ud558\ub294 \ubc29\ubc95\uc744 \uc124\uba85\ud569\ub2c8\ub2e4. \uc608: R \ub2e8\uc704\uc758 Mahalanobis \uac70\ub9ac R\uc758 \ub370\uc774\ud130\uc138\ud2b8\uc5d0 \uc788\ub294 \uac01 \uad00\uce21\uac12 \uc5d0 \ub300\ud55c Mahalanobis \uac70\ub9ac\ub97c \uacc4\uc0b0\ud558\ub824\uba74 \ub2e4\uc74c \ub2e8\uacc4\ub97c \uc0ac\uc6a9\ud558\uc138\uc694. 1\ub2e8\uacc4: \ub370\uc774\ud130\uc138\ud2b8\ub97c \ub9cc\ub4ed\ub2c8\ub2e4. \uba3c\uc800, 20\uba85\uc758 \ud559\uc0dd\uc758 \uc2dc\ud5d8 \uc810\uc218\uc640 \ud568\uaed8 \uacf5\ubd80\ud55c [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[20],"tags":[],"class_list":["post-915","post","type-post","status-publish","format-standard","hentry","category-20"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v21.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>R\uc5d0\uc11c Mahalanobis \uac70\ub9ac\ub97c \uacc4\uc0b0\ud558\ub294 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