{"id":4506,"date":"2023-07-10T13:33:15","date_gmt":"2023-07-10T13:33:15","guid":{"rendered":"https:\/\/statorials.org\/ko\/%e1%84%89%e1%85%b3%e1%84%90%e1%85%a6%e1%84%91%e1%85%a6%e1%84%8b%e1%85%b5%e1%84%8f%e1%85%b3-r\/"},"modified":"2023-07-10T13:33:15","modified_gmt":"2023-07-10T13:33:15","slug":"%e1%84%89%e1%85%b3%e1%84%90%e1%85%a6%e1%84%91%e1%85%a6%e1%84%8b%e1%85%b5%e1%84%8f%e1%85%b3-r","status":"publish","type":"post","link":"https:\/\/statorials.org\/ko\/%e1%84%89%e1%85%b3%e1%84%90%e1%85%a6%e1%84%91%e1%85%a6%e1%84%8b%e1%85%b5%e1%84%8f%e1%85%b3-r\/","title":{"rendered":"\uae30\ub2a5 \uc120\ud0dd\uc744 \uc704\ud574 r\uc5d0\uc11c stepaic\ub97c \uc0ac\uc6a9\ud558\ub294 \ubc29\ubc95"},"content":{"rendered":"<p><\/p>\n<hr>\n<p><span style=\"color: #000000;\"><strong>AIC<\/strong> (Akaike \uc815\ubcf4 \uae30\uc900)\ub294 \ubaa8\ub378\uc774 \ub370\uc774\ud130 \uc138\ud2b8\uc5d0 \uc5bc\ub9c8\ub098 \uc798 \ub9de\ub294\uc9c0\ub97c \uc815\ub7c9\ud654\ud558\ub294 \ub370 \uc0ac\uc6a9\ub418\ub294 \uce21\uc815\ud56d\ubaa9\uc785\ub2c8\ub2e4.<\/span><\/p>\n<p> <span style=\"color: #000000;\">\ub2e4\uc74c\uacfc \uac19\uc774 \uacc4\uc0b0\ub429\ub2c8\ub2e4.<\/span><\/p>\n<p> <strong><span style=\"color: #000000;\">AIC = 2K \u2013 <em>2ln<\/em> (L)<\/span><\/strong><\/p>\n<p> <span style=\"color: #000000;\">\uae08:<\/span><\/p>\n<ul>\n<li> <span style=\"color: #000000;\"><strong>K:<\/strong> \ubaa8\ub378 \ub9e4\uac1c\ubcc0\uc218\uc758 \uc218\uc785\ub2c8\ub2e4. K\uc758 \uae30\ubcf8\uac12\uc740 2\uc774\ubbc0\ub85c \uc608\uce21 \ubcc0\uc218\uac00 \ud558\ub098\ub9cc \uc788\ub294 \ubaa8\ub378\uc758 K \uac12\uc740 2+1 = 3\uc785\ub2c8\ub2e4.<\/span><\/li>\n<li> <span style=\"color: #000000;\"><strong><em>ln<\/em> (L)<\/strong> : \ubaa8\ub378\uc758 \ub85c\uadf8 \uc6b0\ub3c4\uc785\ub2c8\ub2e4. \ub300\ubd80\ubd84\uc758 \ud1b5\uacc4 \uc18c\ud504\ud2b8\uc6e8\uc5b4\ub294 \uc774 \uac12\uc744 \uc790\ub3d9\uc73c\ub85c \uacc4\uc0b0\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4.<\/span><\/li>\n<\/ul>\n<p> <span style=\"color: #000000;\">AIC\ub294 \ub370\uc774\ud130\uc758 \uac00\uc7a5 \ud070 \ubcc0\ud654\ub97c \uc124\uba85\ud558\ub294 \ubaa8\ub378\uc744 \ucc3e\ub294 \ub3d9\uc2dc\uc5d0 \uacfc\ub3c4\ud55c \uc218\uc758 \ub9e4\uac1c\ubcc0\uc218\ub97c \uc0ac\uc6a9\ud558\ub294 \ubaa8\ub378\uc5d0 \ud398\ub110\ud2f0\ub97c \uc801\uc6a9\ud558\ub3c4\ub85d \uc124\uacc4\ub418\uc5c8\uc2b5\ub2c8\ub2e4.<\/span><\/p>\n<p> <span style=\"color: #000000;\">R\uc758 <strong>MASS<\/strong> \ud328\ud0a4\uc9c0\uc5d0 \uc788\ub294 <strong>stepAIC()<\/strong> \ud568\uc218\ub97c \uc0ac\uc6a9\ud558\uba74 AIC \uac12\uc774 \uac00\uc7a5 \ub0ae\uc740 \ubaa8\ub378\uc744 \uc0dd\uc131\ud558\ub294 \uc608\uce21 \ubcc0\uc218(\ub610\ub294 &#8220;\ud2b9\uc131&#8221;) \uc9d1\ud569\uc744 \ucc3e\uc744 \ub54c\uae4c\uc9c0 \ud68c\uadc0 \ubaa8\ub378\uc5d0\uc11c \uc608\uce21 \ubcc0\uc218\ub97c \ubc18\ubcf5\uc801\uc73c\ub85c \ucd94\uac00\ud558\uace0 \uc81c\uac70\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4.<\/span><\/p>\n<p> <span style=\"color: #000000;\">\uc774 \ud568\uc218\ub294 \ub2e4\uc74c \uae30\ubcf8 \uad6c\ubb38\uc744 \uc0ac\uc6a9\ud569\ub2c8\ub2e4.<\/span><\/p>\n<p> <span style=\"color: #000000;\"><strong>stepAIC(\uac1d\uccb4, \ubc29\ud5a5, \u2026)<\/strong><\/span><\/p>\n<p> <span style=\"color: #000000;\">\uae08:<\/span><\/p>\n<ul>\n<li> <span style=\"color: #000000;\"><strong>object<\/strong> : \uc870\uc815\ub41c \ubaa8\ub378\uc758 \uc774\ub984<\/span><\/li>\n<li> <span style=\"color: #000000;\"><strong>\ubc29\ud5a5<\/strong> : \uc0ac\uc6a9\ud560 \ub2e8\uacc4 \uac80\uc0c9 \uc720\ud615(&#8220;\ub4a4\ub85c&#8221;, &#8220;\uc55e\uc73c\ub85c&#8221; \ub610\ub294 &#8220;\ub458 \ub2e4&#8221;)<\/span><\/li>\n<\/ul>\n<p> <span style=\"color: #000000;\">\ub2e4\uc74c \uc608\uc5d0\uc11c\ub294 \uc774 \uae30\ub2a5\uc744 \uc2e4\uc81c\ub85c \uc0ac\uc6a9\ud558\ub294 \ubc29\ubc95\uc744 \ubcf4\uc5ec\uc90d\ub2c8\ub2e4.<\/span><\/p>\n<h2> <span style=\"color: #000000;\"><strong>\uc608: R\uc5d0\uc11c \uae30\ub2a5 \uc120\ud0dd\uc744 \uc704\ud574 stepAIC() \uc0ac\uc6a9<\/strong><\/span><\/h2>\n<p> <span style=\"color: #000000;\">\uc774 \uc608\uc5d0\uc11c\ub294 R\uc5d0 \ub0b4\uc7a5\ub41c <a href=\"https:\/\/statorials.org\/ko\/mtcars-r-\u1103\u1166\u110b\u1175\u1110\u1165-\u1109\u1166\u1110\u1173\/\" target=\"_blank\" rel=\"noopener\">mtcars<\/a> \ub370\uc774\ud130\uc138\ud2b8\ub97c \uc0ac\uc6a9\ud569\ub2c8\ub2e4. \uc5ec\uae30\uc5d0\ub294 32\uac1c \uc790\ub3d9\ucc28\uc5d0 \ub300\ud55c 11\uac1c \uc18d\uc131\uc5d0 \ub300\ud55c \uce21\uc815\uac12\uc774 \ud3ec\ud568\ub418\uc5b4 \uc788\uc2b5\ub2c8\ub2e4.<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <span style=\"color: #008080;\"><strong>#view first six rows of mtcars dataset<\/strong><\/span>\n<strong>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\n<\/strong><\/pre>\n<p> <span style=\"color: #000000;\"><strong>hp\ub97c<\/strong> \uc751\ub2f5 \ubcc0\uc218\ub85c \uc0ac\uc6a9\ud558\uace0 \ub2e4\uc74c\uacfc \uac19\uc740 \uc7a0\uc7ac\uc801 \uc608\uce21 \ubcc0\uc218\ub97c \uc0ac\uc6a9\ud558\uc5ec \ud68c\uadc0 \ubaa8\ub378\uc744 \uc801\ud569\ud654\ud55c\ub2e4\uace0 \uac00\uc815\ud569\ub2c8\ub2e4.<\/span><\/p>\n<ul>\n<li> <span style=\"color: #000000;\"><strong>mpg<\/strong><\/span><\/li>\n<li> <span style=\"color: #000000;\"><strong>\ubb34\uac8c<\/strong><\/span><\/li>\n<li> <span style=\"color: #000000;\"><strong>\ub625<\/strong><\/span><\/li>\n<li> <span style=\"color: #000000;\"><strong>q\ucd08<\/strong><\/span><\/li>\n<\/ul>\n<p> <span style=\"color: #000000;\"><b>MASS<\/b> \ud328\ud0a4\uc9c0\uc758 <strong>stepAIC()<\/strong> \ud568\uc218\ub97c \uc0ac\uc6a9\ud558\uc5ec \uac00\ub2a5\ud55c \uac00\uc7a5 \ub0ae\uc740 AIC \uac12\uc744 \uac16\ub294 \ubaa8\ub378\uc5d0 \ub3c4\ub2ec\ud560 \ub54c\uae4c\uc9c0 \ubaa8\ub378\uc5d0\uc11c \ub2e4\uc591\ud55c \uc608\uce21 \ubcc0\uc218\ub97c \ub354\ud558\uace0 \ube84 \uc218 \uc788\uc2b5\ub2c8\ub2e4.<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <span style=\"color: #000000;\"><strong><span style=\"color: #008000;\">library<\/span> (MASS)\n\n<span style=\"color: #008080;\">#fit initial multiple linear regression model\n<\/span>model &lt;- lm(hp ~ mpg + wt + drat + qsec, data=mtcars)\n\n<span style=\"color: #008080;\">#use both forward and backward selection to find model with lowest AIC\n<\/span>stepAIC(model, direction=\" <span style=\"color: #ff0000;\">both<\/span> \")\n\nStart: AIC=226.88\nhp ~ mpg + wt + drat + qsec\n\n       Df Sum of Sq RSS AIC\n- drat 1 94.9 28183 224.98\n- mpg 1 1519.4 29608 226.56\n  none 28088 226.88\n- wt 1 3861.9 31950 229.00\n-qsec 1 28102.2 56190 247.06\n\nStep: AIC=224.98\nhp ~ mpg + wt + qsec\n\n       Df Sum of Sq RSS AIC\n- mpg 1 1424.5 29608 224.56\n  none 28183 224.98\n+ drat 1 94.9 28088 226.88\n- wt 1 3797.9 31981 227.03\n-qsec 1 29625.1 57808 245.97\n\nStep: AIC=224.56\nhp ~ wt + qsec\n\n       Df Sum of Sq RSS AIC\n  none 29608 224.56\n+ mpg 1 1425 28183 224.98\n+ drat 1 0 29608 226.56\n- wt 1 43026 72633 251.28\n-qsec 1 52881 82489 255.35\n\nCall:\nlm(formula = hp ~ wt + qsec, data = mtcars)\n\nCoefficients:\n(Intercept) wt qsec  \n     441.26 38.67 -23.47  \n<\/strong><\/span><\/pre>\n<p> <span style=\"color: #000000;\">\uacb0\uacfc\ub97c \ud574\uc11d\ud558\ub294 \ubc29\ubc95\uc740 \ub2e4\uc74c\uacfc \uac19\uc2b5\ub2c8\ub2e4.<\/span><\/p>\n<p> <span style=\"color: #000000;\"><strong>(1)<\/strong> \uba3c\uc800, 4\uac1c\uc758 \uc608\uce21 \ubcc0\uc218\ub97c \uc0ac\uc6a9\ud558\uc5ec \ud68c\uadc0 \ubaa8\ub378\uc744 \ud53c\ud305\ud558\ub294 \uac83\ubd80\ud130 \uc2dc\uc791\ud569\ub2c8\ub2e4. \uc774 \ubaa8\ub378\uc758 AIC \uac12\uc740 <strong>226.88<\/strong> \uc785\ub2c8\ub2e4.<\/span><\/p>\n<p> <span style=\"color: #000000;\"><strong>(2)<\/strong> \ub2e4\uc74c\uc73c\ub85c, stepAIC\ub294 \uc608\uce21 \ubcc0\uc218\ub85c <strong>drat\ub97c<\/strong> \uc81c\uac70\ud558\uba74 AIC \uac12\uc774 <strong>224.98<\/strong> \ub85c \ub354 \uac10\uc18c\ud560 \uac83\uc774\ub77c\uace0 \uacb0\uc815\ud569\ub2c8\ub2e4.<\/span><\/p>\n<p> <span style=\"color: #000000;\"><strong>(3)<\/strong> \ub2e4\uc74c\uc73c\ub85c, stepAIC \ubaa8\ub378\uc740 <strong>mpg\ub97c<\/strong> \uc608\uce21 \ubcc0\uc218\ub85c \uc81c\uac70\ud558\uba74 AIC \uac12\uc774 <strong>224.56<\/strong> \uc73c\ub85c \ub354 \uac10\uc18c\ud560 \uac83\uc774\ub77c\uace0 \uacb0\uc815\ud569\ub2c8\ub2e4.<\/span><\/p>\n<p> <span style=\"color: #000000;\"><strong>(4)<\/strong> \ub9c8\uc9c0\ub9c9\uc73c\ub85c stepAIC\ub294 \ubcc0\uc218\ub97c \ucd94\uac00\ud558\uac70\ub098 \uc81c\uac70\ud558\uc5ec AIC \uac12\uc744 \ub354 \uc904\uc77c \uc218 \uc788\ub294 \ubc29\ubc95\uc774 \uc5c6\ub2e4\uace0 \ud310\ub2e8\ud569\ub2c8\ub2e4.<\/span><\/p>\n<p> <span style=\"color: #000000;\">\ub530\ub77c\uc11c \ucd5c\uc885 \ubaa8\ub378\uc740 \ub2e4\uc74c\uacfc \uac19\uc2b5\ub2c8\ub2e4.<\/span><\/p>\n<p> <span style=\"color: #000000;\"><strong>hp = 441.26 + 38.67(\ubb34\uac8c) \u2013 23.47(qsec)<\/strong><\/span><\/p>\n<p> <span style=\"color: #000000;\">\uc774 \ubaa8\ub378\uc758 AIC \uac12\uc740 <strong>224.56<\/strong> \uc785\ub2c8\ub2e4.<\/span><\/p>\n<h2> <span style=\"color: #000000;\"><strong>\ucd94\uac00 \ub9ac\uc18c\uc2a4<\/strong><\/span><\/h2>\n<p> <span style=\"color: #000000;\">\ub2e4\uc74c \ud29c\ud1a0\ub9ac\uc5bc\uc5d0\uc11c\ub294 R\uc5d0\uc11c \ub2e4\ub978 \uc77c\ubc18\uc801\uc778 \uc791\uc5c5\uc744 \uc218\ud589\ud558\ub294 \ubc29\ubc95\uc744 \uc124\uba85\ud569\ub2c8\ub2e4.<\/span><\/p>\n<p> <span style=\"color: #000000;\"><a href=\"https:\/\/statorials.org\/ko\/\u1103\u1161\u110c\u116e\u11bc-\u1109\u1165\u11ab\u1112\u1167\u11bc-\u1112\u116c\u1100\u1171-r\/\" target=\"_blank\" rel=\"noopener\">R\uc5d0\uc11c \ub2e4\uc911 \uc120\ud615 \ud68c\uadc0\ub97c \uc218\ud589\ud558\ub294 \ubc29\ubc95<\/a><br \/> <a href=\"https:\/\/statorials.org\/ko\/r\u110b\u1174-\u110c\u1169\u1100\u1161\u11a8\u1107\u1167\u11af-\u1112\u116c\u1100\u1171\/\" target=\"_blank\" rel=\"noopener\">R\uc5d0\uc11c \uc870\uac01\ubcc4 \ud68c\uadc0\ub97c \uc218\ud589\ud558\ub294 \ubc29\ubc95<\/a><br \/> <a href=\"https:\/\/statorials.org\/ko\/r\u110b\u1174-\u1109\u1173\u1111\u1173\u11af\u1105\u1161\u110b\u1175\u11ab-\u1112\u116c\u1100\u1171\/\" target=\"_blank\" rel=\"noopener\">R\uc5d0\uc11c \uc2a4\ud50c\ub77c\uc778 \ud68c\uadc0\ub97c \uc218\ud589\ud558\ub294 \ubc29\ubc95<\/a><\/span><\/p>\n","protected":false},"excerpt":{"rendered":"<p>AIC (Akaike \uc815\ubcf4 \uae30\uc900)\ub294 \ubaa8\ub378\uc774 \ub370\uc774\ud130 \uc138\ud2b8\uc5d0 \uc5bc\ub9c8\ub098 \uc798 \ub9de\ub294\uc9c0\ub97c \uc815\ub7c9\ud654\ud558\ub294 \ub370 \uc0ac\uc6a9\ub418\ub294 \uce21\uc815\ud56d\ubaa9\uc785\ub2c8\ub2e4. \ub2e4\uc74c\uacfc \uac19\uc774 \uacc4\uc0b0\ub429\ub2c8\ub2e4. AIC = 2K \u2013 2ln (L) \uae08: K: \ubaa8\ub378 \ub9e4\uac1c\ubcc0\uc218\uc758 \uc218\uc785\ub2c8\ub2e4. K\uc758 \uae30\ubcf8\uac12\uc740 2\uc774\ubbc0\ub85c \uc608\uce21 \ubcc0\uc218\uac00 \ud558\ub098\ub9cc \uc788\ub294 \ubaa8\ub378\uc758 K \uac12\uc740 2+1 = 3\uc785\ub2c8\ub2e4. ln (L) : \ubaa8\ub378\uc758 \ub85c\uadf8 \uc6b0\ub3c4\uc785\ub2c8\ub2e4. \ub300\ubd80\ubd84\uc758 \ud1b5\uacc4 \uc18c\ud504\ud2b8\uc6e8\uc5b4\ub294 \uc774 \uac12\uc744 \uc790\ub3d9\uc73c\ub85c \uacc4\uc0b0\ud560 \uc218 [&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-4506","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>\uae30\ub2a5 \uc120\ud0dd\uc744 \uc704\ud574 R\uc5d0\uc11c stepAIC\ub97c \uc0ac\uc6a9\ud558\ub294 \ubc29\ubc95 - \ud1b5\uacc4<\/title>\n<meta name=\"description\" content=\"\uc774 \ud29c\ud1a0\ub9ac\uc5bc\uc5d0\uc11c\ub294 R\uc758 stepAIC \ud568\uc218\ub97c \uc0ac\uc6a9\ud558\uc5ec AIC\ub97c \uc0ac\uc6a9\ud558\uc5ec \ubaa8\ub378 \uc120\ud0dd\uc744 \uc218\ud589\ud558\ub294 \ubc29\ubc95\uc744 \uc608\uc81c\uc640 \ud568\uaed8 \uc124\uba85\ud569\ub2c8\ub2e4.\" \/>\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\/ko\/\u1109\u1173\u1110\u1166\u1111\u1166\u110b\u1175\u110f\u1173-r\/\" \/>\n<meta property=\"og:locale\" content=\"ko_KR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"\uae30\ub2a5 \uc120\ud0dd\uc744 \uc704\ud574 R\uc5d0\uc11c stepAIC\ub97c \uc0ac\uc6a9\ud558\ub294 \ubc29\ubc95 - 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