{"id":1761,"date":"2023-07-25T02:23:44","date_gmt":"2023-07-25T02:23:44","guid":{"rendered":"https:\/\/statorials.org\/ko\/%e1%84%89%e1%85%ae%e1%84%8c%e1%85%ae%e1%86%ab%e1%84%8b%e1%85%b5-2%e1%84%80%e1%85%a2-%e1%84%8b%e1%85%b5%e1%84%89%e1%85%a1%e1%86%bc%e1%84%8b%e1%85%b5%e1%86%ab-%e1%84%8b%e1%85%ad%e1%84%8b%e1%85%b5\/"},"modified":"2023-07-25T02:23:44","modified_gmt":"2023-07-25T02:23:44","slug":"%e1%84%89%e1%85%ae%e1%84%8c%e1%85%ae%e1%86%ab%e1%84%8b%e1%85%b5-2%e1%84%80%e1%85%a2-%e1%84%8b%e1%85%b5%e1%84%89%e1%85%a1%e1%86%bc%e1%84%8b%e1%85%b5%e1%86%ab-%e1%84%8b%e1%85%ad%e1%84%8b%e1%85%b5","status":"publish","type":"post","link":"https:\/\/statorials.org\/ko\/%e1%84%89%e1%85%ae%e1%84%8c%e1%85%ae%e1%86%ab%e1%84%8b%e1%85%b5-2%e1%84%80%e1%85%a2-%e1%84%8b%e1%85%b5%e1%84%89%e1%85%a1%e1%86%bc%e1%84%8b%e1%85%b5%e1%86%ab-%e1%84%8b%e1%85%ad%e1%84%8b%e1%85%b5\/","title":{"rendered":"\ud574\uacb0 \ubc29\ubc95: \ub300\ube44\ub294 \uc218\uc900\uc774 2\uac1c \uc774\uc0c1\uc778 \uc694\uc778\uc5d0\ub9cc \uc801\uc6a9\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4."},"content":{"rendered":"

<\/p>\n

\n

R\uc5d0\uc11c \ubc1c\uc0dd\ud560 \uc218 \uc788\ub294 \uc77c\ubc18\uc801\uc778 \uc624\ub958\ub294 \ub2e4\uc74c\uacfc \uac19\uc2b5\ub2c8\ub2e4.<\/span><\/p>\n

 Error in `contrasts<-`(`*tmp*`, value = contr.funs[1 + isOF[nn]]): \n  contrasts can be applied only to factors with 2 or more levels<\/strong><\/pre>\n
 \uc774 \uc624\ub958\ub294 \uc694\uc778 \ub610\ub294 \ud2b9\uc131\uc774\uace0 \uace0\uc720\ud55c \uac12\uc774 \ud558\ub098\ub9cc \uc788\ub294 \uc608\uce21 \ubcc0\uc218\ub97c \uc0ac\uc6a9\ud558\uc5ec \ud68c\uadc0 \ubaa8\ub378\uc744 \uc801\ud569\uc2dc\ud0a4\ub824\uace0 \ud560 \ub54c \ubc1c\uc0dd\ud569\ub2c8\ub2e4.<\/span><\/p>\n
 \uc774 \ud29c\ud1a0\ub9ac\uc5bc\uc5d0\uc11c\ub294 \uc774 \uc624\ub958\ub97c \ud574\uacb0\ud558\ub294 \ub370 \uc0ac\uc6a9\ud560 \uc218 \uc788\ub294 \uc815\ud655\ud55c \ub2e8\uacc4\ub97c \uacf5\uc720\ud569\ub2c8\ub2e4.<\/span><\/p>\n
 \uc608: “\ub300\ube44\ub294 \uc218\uc900\uc774 2\uac1c \uc774\uc0c1\uc778 \uc694\uc778\uc5d0\ub9cc \uc801\uc6a9\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4” \uc218\uc815 \ubc29\ubc95<\/strong><\/h3>\n
 R\uc5d0 \ub2e4\uc74c\uacfc \uac19\uc740 \ub370\uc774\ud130 \ud504\ub808\uc784\uc774 \uc788\ub2e4\uace0 \uac00\uc815\ud569\ub2c8\ub2e4.<\/span><\/p>\n
 #create data frame\n<\/span>df <- data. frame<\/span> (var1=c(1, 3, 3, 4, 5),\n                 var2=as. factor<\/span> (4),\n                 var3=c(7, 7, 8, 3, 2),\n                 var4=c(1, 1, 2, 8, 9))\n\n#view data frame\n<\/span>df\n\n  var1 var2 var3 var4\n1 1 4 7 1\n2 3 4 7 1\n3 3 4 8 2\n4 4 4 3 8\n5 5 4 2 9\n<\/strong><\/pre>\n
 \uc608\uce21 \ubcc0\uc218 var2<\/strong> \ub294 \uc694\uc778\uc774\uba70 \uace0\uc720\ud55c \uac12\uc774 \ud558\ub098\ub9cc \uc788\uc2b5\ub2c8\ub2e4.<\/span><\/p>\n
 var2\ub97c<\/strong> \uc608\uce21 \ubcc0\uc218\ub85c \uc0ac\uc6a9\ud558\uc5ec \ub2e4\uc911 \uc120\ud615 \ud68c\uadc0 \ubaa8\ub378\uc744 \ub9de\ucd94\ub824\uace0 \ud558\uba74 \ub2e4\uc74c \uc624\ub958\uac00 \ubc1c\uc0dd\ud569\ub2c8\ub2e4.<\/span><\/p>\n
 #attempt to fit regression model<\/span>\nmodel <- lm(var4 ~ var1 + var2 + var3, data=df)\n\nError in `contrasts<-`(`*tmp*`, value = contr.funs[1 + isOF[nn]]): \n  contrasts can be applied only to factors with 2 or more levels\n<\/strong><\/pre>\n
 var2<\/strong> \uc5d0\ub294 \ub2e8 \ud558\ub098\uc758 \uace0\uc720 \uac12(4)\ub9cc \uc788\uae30 \ub54c\ubb38\uc5d0 \uc774 \uc624\ub958\uac00 \ubc1c\uc0dd\ud569\ub2c8\ub2e4. \uc774 \uc608\uce21 \ubcc0\uc218\uc5d0\ub294 \ubcc0\ub3d9\uc774 \uc5c6\uae30 \ub54c\ubb38\uc5d0 R\uc740 \ud68c\uadc0 \ubaa8\ub378\uc744 \ud6a8\uacfc\uc801\uc73c\ub85c \uc801\ud569\ud560 \uc218 \uc5c6\uc2b5\ub2c8\ub2e4.<\/span><\/p>\n
 \uc2e4\uc81c\ub85c \ub2e4\uc74c \uad6c\ubb38\uc744 \uc0ac\uc6a9\ud558\uc5ec \ub370\uc774\ud130 \ud504\ub808\uc784\uc758 \uac01 \ubcc0\uc218\uc5d0 \ub300\ud55c \uace0\uc720 \uac12 \uc218\ub97c \uacc4\uc0b0\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4.<\/span><\/p>\n
 #count unique values for each variable<\/span>\nsapply( lapply<\/span> (df, unique), length)\n\nvar1 var2 var3 var4 \n   4 1 4 4 \n<\/strong><\/pre>\n
 \uadf8\ub9ac\uace0 lapply()<\/a> \ud568\uc218\ub97c \uc0ac\uc6a9\ud558\uc5ec \uac01 \ubcc0\uc218\uc758 \uace0\uc720\ud55c \uac12\uc744 \uac01\uac01 \ud45c\uc2dc\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4.<\/span><\/p>\n
 #display unique values for each variable\nlapply(df[c('var1', 'var2', 'var3')], unique)\n<\/span><\/span>\n$var1\n[1] 1 3 4 5\n\n$var2\n[1] 4\nLevels: 4\n\n$var3\n[1] 7 8 3 2<\/strong><\/pre>\n
 var2<\/strong> \uac00 \uace0\uc720\ud55c \uac12\uc744 \uac16\ub294 \uc720\uc77c\ud55c \ubcc0\uc218\uc784\uc744 \uc54c \uc218 \uc788\uc2b5\ub2c8\ub2e4. \ub530\ub77c\uc11c \ud68c\uadc0 \ubaa8\ub378\uc5d0\uc11c var2\ub97c \uc81c\uac70\ud558\uba74 \uc774 \uc624\ub958\ub97c \uc218\uc815\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4.<\/span><\/p>\n
 #fit regression model without using var2<\/em> as a predictor variable<\/span>\nmodel <- lm(var4 ~ var1 + var3, data=df)\n\n#view model summary\n<\/span>summary(model)\n\nCall:\nlm(formula = var4 ~ var1 + var3, data = df)\n\nResiduals:\n       1 2 3 4 5 \n 0.02326 -1.23256 0.91860 0.53488 -0.24419 \n\nCoefficients:\n            Estimate Std. Error t value Pr(>|t|)  \n(Intercept) 8.4070 3.6317 2.315 0.1466  \nvar1 0.6279 0.6191 1.014 0.4172  \nvar3 -1.1512 0.3399 -3.387 0.0772 .\n---\nSignificant. codes: 0 '***' 0.001 '**' 0.01 '*' 0.05 '.' 0.1 ' ' 1\n\nResidual standard error: 1.164 on 2 degrees of freedom\nMultiple R-squared: 0.9569, Adjusted R-squared: 0.9137 \nF-statistic: 22.18 on 2 and 2 DF, p-value: 0.04314<\/strong><\/pre>\n
 \ud68c\uadc0 \ubaa8\ub378\uc5d0\uc11c var2\ub97c<\/strong> \uc81c\uac70\ud558\uba74 \ub354 \uc774\uc0c1 \uc774\uc804 \uc624\ub958\uac00 \ubc1c\uc0dd\ud558\uc9c0 \uc54a\uc2b5\ub2c8\ub2e4.<\/span><\/p>\n
 \ucd94\uac00 \ub9ac\uc18c\uc2a4<\/strong><\/span><\/h3>\n
 R\uc5d0\uc11c \ub2e8\uc21c \uc120\ud615 \ud68c\uadc0\ub97c \uc218\ud589\ud558\ub294 \ubc29\ubc95<\/a>
 R\uc5d0\uc11c \ub2e4\uc911 \uc120\ud615 \ud68c\uadc0\ub97c \uc218\ud589\ud558\ub294 \ubc29\ubc95<\/a>
 R\uc5d0\uc11c \ub85c\uc9c0\uc2a4\ud2f1 \ud68c\uadc0\ub97c \uc218\ud589\ud558\ub294 \ubc29\ubc95<\/p>\n","protected":false},"excerpt":{"rendered":"
R\uc5d0\uc11c \ubc1c\uc0dd\ud560 \uc218 \uc788\ub294 \uc77c\ubc18\uc801\uc778 \uc624\ub958\ub294 \ub2e4\uc74c\uacfc \uac19\uc2b5\ub2c8\ub2e4. Error in `contrasts<-`(`*tmp*`, value = contr.funs[1 + isOF[nn]]): contrasts can be applied only to factors with 2 or more levels \uc774 \uc624\ub958\ub294 \uc694\uc778 \ub610\ub294 \ud2b9\uc131\uc774\uace0 \uace0\uc720\ud55c \uac12\uc774 \ud558\ub098\ub9cc \uc788\ub294 \uc608\uce21 \ubcc0\uc218\ub97c \uc0ac\uc6a9\ud558\uc5ec \ud68c\uadc0 \ubaa8\ub378\uc744 \uc801\ud569\uc2dc\ud0a4\ub824\uace0 \ud560 \ub54c \ubc1c\uc0dd\ud569\ub2c8\ub2e4. \uc774 \ud29c\ud1a0\ub9ac\uc5bc\uc5d0\uc11c\ub294 \uc774 \uc624\ub958\ub97c \ud574\uacb0\ud558\ub294 \ub370 \uc0ac\uc6a9\ud560 \uc218 \uc788\ub294 […]<\/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-1761","post","type-post","status-publish","format-standard","hentry","category-20"],"yoast_head":"\n\ud574\uacb0 \ubc29\ubc95: \ub300\ube44\ub294 \uc218\uc900\uc774 2\uac1c \uc774\uc0c1\uc778 \uc694\uc778\uc5d0\ub9cc \uc801\uc6a9\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4.<\/title>\n<meta name=\"description\" content=\"\uc774 \ud29c\ud1a0\ub9ac\uc5bc\uc5d0\uc11c\ub294 R\uc5d0\uc11c \ub2e4\uc74c \uc624\ub958\ub97c \uc218\uc815\ud558\ub294 \ubc29\ubc95\uc744 \uc124\uba85\ud569\ub2c8\ub2e4. \ub300\ube44\ub294 \uc218\uc900\uc774 2\uac1c \uc774\uc0c1\uc778 \uc694\uc778\uc5d0\ub9cc \uc801\uc6a9\ud560 \uc218 \uc788\uc2b5\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\u116e\u110c\u116e\u11ab\u110b\u1175-2\u1100\u1162-\u110b\u1175\u1109\u1161\u11bc\u110b\u1175\u11ab-\u110b\u116d\u110b\u1175\/\" \/>\n<meta property=\"og:locale\" content=\"ko_KR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"\ud574\uacb0 \ubc29\ubc95: \ub300\ube44\ub294 \uc218\uc900\uc774 2\uac1c \uc774\uc0c1\uc778 \uc694\uc778\uc5d0\ub9cc \uc801\uc6a9\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4.\" \/>\n<meta property=\"og:description\" content=\"\uc774 \ud29c\ud1a0\ub9ac\uc5bc\uc5d0\uc11c\ub294 R\uc5d0\uc11c \ub2e4\uc74c \uc624\ub958\ub97c \uc218\uc815\ud558\ub294 \ubc29\ubc95\uc744 \uc124\uba85\ud569\ub2c8\ub2e4. \ub300\ube44\ub294 \uc218\uc900\uc774 2\uac1c \uc774\uc0c1\uc778 \uc694\uc778\uc5d0\ub9cc \uc801\uc6a9\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/statorials.org\/ko\/\u1109\u116e\u110c\u116e\u11ab\u110b\u1175-2\u1100\u1162-\u110b\u1175\u1109\u1161\u11bc\u110b\u1175\u11ab-\u110b\u116d\u110b\u1175\/\" \/>\n<meta property=\"og:site_name\" content=\"Statorials\" \/>\n<meta property=\"article:published_time\" content=\"2023-07-25T02:23:44+00:00\" \/>\n<meta name=\"author\" content=\"\ubca4\uc790\ubbfc \uc564\ub354\uc2a8\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" 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