<\/p>\n
R\uc5d0\uc11c \uae30\uc220 \ud1b5\uacc4\ub97c \uacc4\uc0b0\ud560 \ub54c na.rm=TRUE<\/strong> \uc778\uc218\ub97c \uc0ac\uc6a9\ud558\uc5ec \ub204\ub77d\ub41c \uac12\uc744 \uc81c\uc678\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4.<\/span><\/p>\n \ub2e4\uc74c \uc608\uc5d0\uc11c\ub294 \uc2e4\uc81c\ub85c \ubca1\ud130 \ubc0f \ub370\uc774\ud130 \ud504\ub808\uc784\uc5d0\uc11c \uc774 \uc778\uc218\ub97c \uc0ac\uc6a9\ud558\ub294 \ubc29\ubc95\uc744 \ubcf4\uc5ec\uc90d\ub2c8\ub2e4.<\/span><\/p>\n \ub204\ub77d\ub41c \uac12\uc774 \ud3ec\ud568\ub41c R\uc758 \ub2e4\uc74c \ubca1\ud130\uc758 \ud3c9\uade0, \ud569\uacc4, \ucd5c\ub300\uac12 \ubc0f \ud45c\uc900 \ud3b8\ucc28\ub97c \uacc4\uc0b0\ud558\ub824\uace0 \ud55c\ub2e4\uace0 \uac00\uc815\ud569\ub2c8\ub2e4.<\/span><\/p>\n \uc774\ub7ec\ud55c \uac01 \ud568\uc218\ub294 NA<\/strong> \uac12\uc744 \ubc18\ud658\ud569\ub2c8\ub2e4.<\/span><\/p>\n \uc774\ub7ec\ud55c \uacc4\uc0b0\uc744 \uc218\ud589\ud560 \ub54c \ub204\ub77d\ub41c \uac12\uc744 \uc81c\uc678\ud558\ub824\uba74 \ub2e4\uc74c\uacfc \uac19\uc774 na.rm = TRUE<\/strong> \uc778\uc218\ub97c \ud3ec\ud568\ud558\uba74 \ub429\ub2c8\ub2e4.<\/span><\/p>\n \ub204\ub77d\ub41c \uac12\uc744 \uc81c\uc678\ud558\uba74\uc11c \uac01 \uacc4\uc0b0\uc744 \uc131\uacf5\uc801\uc73c\ub85c \uc218\ud589\ud560 \uc218 \uc788\uc5c8\uc2b5\ub2c8\ub2e4.<\/span><\/p>\n R\uc5d0 \ub204\ub77d\ub41c \uac12\uc774 \ud3ec\ud568\ub41c \ub2e4\uc74c \ub370\uc774\ud130 \ud504\ub808\uc784\uc774 \uc788\ub2e4\uace0 \uac00\uc815\ud569\ub2c8\ub2e4.<\/span><\/p>\n apply()<\/strong> \ud568\uc218\ub97c \uc0ac\uc6a9\ud558\uc5ec \ub370\uc774\ud130 \ud504\ub808\uc784\uc758 \uac01 \uc5f4\uc5d0 \ub300\ud55c \uae30\uc220 \ud1b5\uacc4\ub97c \uacc4\uc0b0\ud558\uace0 na.rm = TRUE<\/strong> \uc778\uc218\ub97c \uc0ac\uc6a9\ud558\uc5ec \uc774\ub7ec\ud55c \uacc4\uc0b0\uc744 \uc218\ud589\ud560 \ub54c \ub204\ub77d\ub41c \uac12\uc744 \uc81c\uc678\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4.<\/span><\/p>\n \uc774\ubc88\uc5d0\ub3c4 \uacb0\uce21\uac12\uc744 \uc81c\uc678\ud558\uba74\uc11c \uac01 \uacc4\uc0b0\uc744 \uc131\uacf5\uc801\uc73c\ub85c \uc644\ub8cc\ud560 \uc218 \uc788\uc5c8\uc2b5\ub2c8\ub2e4.<\/span><\/p>\n \ub2e4\uc74c \ud29c\ud1a0\ub9ac\uc5bc\uc5d0\uc11c\ub294 R\uc5d0\uc11c \ub204\ub77d\ub41c \uac12\uc774 \uc788\ub294 \ub2e4\ub978 \uc77c\ubc18\uc801\uc778 \uc791\uc5c5\uc744 \uc218\ud589\ud558\ub294 \ubc29\ubc95\uc744 \uc124\uba85\ud569\ub2c8\ub2e4.<\/span><\/p>\n R\uc5d0\uc11c is.null\uc744 \uc0ac\uc6a9\ud558\ub294 \ubc29\ubc95<\/a> R\uc5d0\uc11c \uae30\uc220 \ud1b5\uacc4\ub97c \uacc4\uc0b0\ud560 \ub54c na.rm=TRUE \uc778\uc218\ub97c \uc0ac\uc6a9\ud558\uc5ec \ub204\ub77d\ub41c \uac12\uc744 \uc81c\uc678\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4. #calculate mean and exclude missing values mean(x, na. rm = TRUE ) #calculate sum and exclude missing values sum(x, na. rm = TRUE ) #calculate maximum and exclude missing values max(x, na. rm = TRUE ) #calculate standard deviation and exclude missing […]<\/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-1860","post","type-post","status-publish","format-standard","hentry","category-20"],"yoast_head":"\n #calculate mean and exclude missing values<\/span>\nmean(x, na. rm<\/span> = TRUE<\/span> )\n\n#calculate sum and exclude missing values<\/span> \nsum(x, na. rm<\/span> = TRUE<\/span> )\n\n#calculate maximum and exclude missing values<\/span> \nmax(x, na. rm<\/span> = TRUE<\/span> )\n\n#calculate standard deviation and exclude missing values<\/span> \nsd(x, na. rm<\/span> = TRUE<\/span> )\n<\/strong><\/pre>\n \uc608 1: \ubca1\ud130\uc640 \ud568\uaed8 na.rm \uc0ac\uc6a9<\/strong><\/span><\/h3>\n
#define vector with some missing values<\/span>\nx <- c(3, 4, 5, 5, 7, NA, 12, NA, 16)\n\nmean(x)\n\n[1] NA\n\nsum(x)\n\n[1] NA\n\nmax(x)\n\n[1] NA\n\nsd(x)\n\n[1] NA\n<\/strong><\/pre>\n #define vector with some missing values<\/span>\nx <- c(3, 4, 5, 5, 7, NA, 12, NA, 16)\n\nmean(x, na. rm<\/span> = TRUE<\/span> )\n\n[1] 7.428571\n\nsum(x, na. rm<\/span> = TRUE<\/span> )\n\n[1] 52\n\nmax(x, na. rm<\/span> = TRUE<\/span> )\n\n[1] 16\n\nsd(x, na. rm<\/span> = TRUE<\/span> )\n\n[1] 4.790864\n<\/strong><\/pre>\n \uc608 2: \ub370\uc774\ud130 \ud504\ub808\uc784\uc5d0 na.rm \uc0ac\uc6a9<\/strong><\/span><\/h3>\n
#create data frame\n<\/span>df <- data. frame<\/span> (var1=c(1, 3, 3, 4, 5),\n var2=c(7, 7, NA, 3, 2),\n var3=c(3, 3, NA, 6, 8),\n var4=c(1, 1, 2, 8, NA))\n\n#view data frame\n<\/span>df\n\n var1 var2 var3 var4\n1 1 7 3 1\n2 3 7 3 1\n3 3 NA NA 2\n4 4 3 6 8\n5 5 2 8 NA\n<\/strong><\/pre>\n #calculate mean of each column\napply(df, 2, mean, na. rm<\/span> = TRUE<\/span> )\n\nvar1 var2 var3 var4 \n3.20 4.75 5.00 3.00 \n\n#calculate sum of each column<\/span>\napply(df, 2, sum, na. rm<\/span> = TRUE<\/span> )\n\nvar1 var2 var3 var4 \n 16 19 20 12 \n\n#calculate max of each column<\/span>\napply(df, 2, max, na. rm<\/span> = TRUE<\/span> )\n\nvar1 var2 var3 var4 \n 5 7 8 8 \n\n#calculate standard deviation of each column<\/span>\napply(df, 2, sd, na. rm<\/span> = TRUE<\/span> )\n\n var1 var2 var3 var4 \n1.483240 2.629956 2.449490 3.366502<\/span><\/span><\/strong><\/pre>\n \ucd94\uac00 \ub9ac\uc18c\uc2a4<\/strong><\/span><\/h3>\n
R\uc5d0\uc11c na.omit\uc744 \uc0ac\uc6a9\ud558\ub294 \ubc29\ubc95<\/a>
R\uc5d0\uc11c is.na\ub97c \uc0ac\uc6a9\ud558\ub294 \ubc29\ubc95<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"