{"id":1193,"date":"2019-05-08T10:45:14","date_gmt":"2019-05-08T01:45:14","guid":{"rendered":"http:\/\/141.164.34.82\/?p=1193"},"modified":"2019-05-08T15:48:39","modified_gmt":"2019-05-08T06:48:39","slug":"%ed%8c%a9%ed%84%b0-%ec%9e%90%eb%a3%8c-%eb%8b%a4%eb%a3%a8%ea%b8%b0","status":"publish","type":"post","link":"http:\/\/ds.sumeun.org\/?p=1193","title":{"rendered":"\ud329\ud130 \uc790\ub8cc \ub2e4\ub8e8\uae30"},"content":{"rendered":"<h1>\ud329\ud130 \uc790\ub8cc\ud615<\/h1>\n<p><iframe loading=\"lazy\" width=\"560\" height=\"315\" src=\"https:\/\/www.youtube.com\/embed\/xkRBfy8_2MU\" frameborder=\"0\" allow=\"accelerometer; autoplay; encrypted-media; gyroscope; picture-in-picture\" allowfullscreen><\/iframe><\/p>\n<p>&lt;\ucd9c\ucc98: Youtube\/Datacamp&gt;<\/p>\n<p>\ud329\ud130\ud615\uc740 \ubc94\uc8fc\ud615 \ub370\uc774\ud130\ub97c \uc800\uc7a5\ud558\ub294 \ub370 \uc0ac\uc6a9\ud55c\ub2e4. \ubc94\uc8fc\ud615 \ub370\uc774\ud130\ub294 \uc21c\uc704\ub97c \uc815\ud560 \uc218 \uc788\ub294 <strong>\uc21c\uc704\ud615 \ub370\uc774\ud130<\/strong>\uc640 \uc21c\uc704\uac00 \uc5c6\ub294 <strong>\ubc94\uc8fc\ud615 \ub370\uc774\ud130<\/strong>\ub85c \ub098\ub260 \uc218 \uc788\ub4ef\uc774 R\uc758 \ud329\ud130\ud615 \ub370\uc774\ud130\ub3c4 \uc21c\uc704\uac00 \uc788\ub294 \uc21c\uc704\ud615(<code>ordered<\/code>)\uacfc \uc21c\uc704\uac00 \uc5c6\ub294 \ud329\ud130\ud615(<code>factor<\/code>)\uc73c\ub85c \ub098\ub25c\ub2e4. \uc77c\ub2e8 \ud329\ud130\ud615\uacfc \uc21c\uc704\ud615 \ubca1\ud130\ub97c \ub9cc\ub4dc\ub09c \ubc29\ubc95\uc740 \ub2e4\uc74c\uacfc \uac19\ub2e4.<\/p>\n<pre><code class=\"r\">x &lt;- factor(c(&#39;A&#39;, &#39;B&#39;, &#39;A&#39;, &#39;A&#39;, &#39;C&#39;, &#39;B&#39;))\nx\n<\/code><\/pre>\n<pre>## [1] A B A A C B\n## Levels: A B C\n<\/pre>\n<pre><code class=\"r\">class(x)\n<\/code><\/pre>\n<pre>## [1] &quot;factor&quot;\n<\/pre>\n<p>\ud329\ud130 \ubca1\ud130\ub97c \ucd9c\ub825\ud558\uba74 \uc5b8\ub73b \ubcf4\uae30\uc5d0 \ubb38\uc790\uc5f4\ucc98\ub7fc \ubcf4\uc774\uc9c0\ub9cc \ubb38\uc790\uc5f4 \ubca1\ud130\uc640 \ub2ec\ub9ac <code>&quot;<\/code>(\ub530\uc634\ud45c)\uac00 \uc5c6\ub2e4. \uadf8\ub9ac\uace0 <code>Levels:<\/code>\ub97c \ud1b5\ud574 \ud2b9\uc815\ud55c \uc218\uc900\uc758 \uac12\uc744 \uac00\uc9c8 \uc218 \uc788\ub294 \ud329\ud130\ud615\uc784\uc744 \uc54c\ub824\uc900\ub2e4. <code>class()<\/code>\ud568\uc218\ub97c \ud1b5\ud574 \ubca1\ud130\uc758 \ud074\ub798\uc2a4\ub97c \ud655\uc778\ud560 \uc218\ub3c4 \uc788\ub2e4. <\/p>\n<pre><code class=\"r\">x &lt;- ordered(c(&#39;High&#39;, &#39;Medium&#39;, &#39;Low&#39;, &#39;Medium&#39;, &#39;Low&#39;), \n             levels=c(&#39;Low&#39;, &#39;Medium&#39;, &#39;High&#39;))\nx\n<\/code><\/pre>\n<pre>## [1] High   Medium Low    Medium Low   \n## Levels: Low &lt; Medium &lt; High\n<\/pre>\n<pre><code class=\"r\">class(x)\n<\/code><\/pre>\n<pre>## [1] &quot;ordered&quot; &quot;factor&quot;\n<\/pre>\n<p>\uc21c\uc704\ud615 \ubca1\ud130\ub294 <code>ordered()<\/code> \ud568\uc218\ub97c \uc0ac\uc6a9\ud55c\ub2e4. \uc774\ub54c \uc21c\uc704\ub294 <code>levels=<\/code>\ub97c \ud1b5\ud574 \ub0ae\uc740 \uc21c\uc704\ubd80\ud130 \ub192\uc740 \uc21c\uc704\uae4c\uc9c0\uc758 \ubc94\uc8fc\ub97c \uc9c0\uc815\ud574\uc900\ub2e4. \uc21c\uc704\ud615 \ubca1\ud130\uc758 \ucd9c\ub825 \uacb0\uacfc\ub294 \ud329\ud130\ud615 \ubca1\ud130\uc758 \ucd9c\ub825 \uacb0\uacfc\uc640 \uac70\uc758 \ube44\uc2b7\ud558\uc9c0\ub9cc <code>Levels:<\/code>\uc5d0 \ubd80\ub4f1\ud638(<code>&lt;<\/code>)\ub97c \ud1b5\ud574 \ubc94\uc8fc \uc0ac\uc774\uc758 \uc21c\uc704\ub97c \uc54c\ub824\uc900\ub2e4. \uc21c\uc704\ud615 \ubca1\ud130\ub294 <code>factor<\/code>\ud615\uc758 \ubaa8\ub4e0 \ud2b9\uc9d5\uc744 \uac16\uace0, <code>ordered<\/code>\ud615\uc758 \ud2b9\uc9d5(\ubc94\uc8fc \uc0ac\uc774\uc758 \uc21c\uc704)\ub97c \ucd94\uac00\ub41c\ub2e4.<\/p>\n<h2>\ud329\ud130\ud615\uc758 \uc911\uc694\uc131<\/h2>\n<p>\ud329\ud130\ud615\uc740 \ub370\uc774\ud130 \ubd84\uc11d\uc5d0 \uc788\uc5b4\uc11c \uc911\uc694\ud55c \uc5ed\ud560\uc744 \ud55c\ub2e4. \ud2b9\ud788 \uc5b4\ub5a4 \ubcc0\uc218\uac00 \ud329\ud130\ud615\uc774\ub0d0 \uc5f0\uc18d\ud615\uc774\ub0d0\uc5d0 \ub530\ub77c\uc11c \ubd84\uc11d \uacb0\uacfc\uac00 \ud310\uc774\ud558\uac8c \ub2ec\ub77c\uc9c8 \uc218 \uc788\ub2e4. \ub2e4\uc74c\uc740 \ubcc0\uc218 <code>x<\/code>\uc5d0 <code>1<\/code>, <code>2<\/code>, <code>3<\/code> \uc911 \ud558\ub098\uc758 \uac12\uc774 \ub4e4\uc5b4 \uc788\ub2e4. \uc774\ub54c \ubcc0\uc218 <code>x<\/code>\ub97c \uc5f0\uc18d\ud615\uc73c\ub85c \ub193\uace0 \ubd84\uc11d\ud560 \ub54c\uc640 \ubc94\uc8fc\ud615\uc73c\ub85c \ub193\uace0 \ubd84\uc11d\ud560 \ub54c \uacb0\uacfc\uac00 \ub2ec\ub77c\uc9d0\uc744 \ud655\uc778\ud560 \uc218 \uc788\ub2e4. <\/p>\n<pre><code class=\"r\">n = 30\nx &lt;- sample(1:3, n, replace=TRUE); x\n<\/code><\/pre>\n<pre>##  [1] 2 1 1 3 2 1 2 3 1 1 3 3 1 1 3 2 2 3 2 1 2 2 3 1 1 3 3 1 3 3\n<\/pre>\n<pre><code class=\"r\">y &lt;- ifelse(x&gt;2, x + rnorm(n), rnorm(n)-x)\nlm(y ~ x)\n<\/code><\/pre>\n<pre>## \n## Call:\n## lm(formula = y ~ x)\n## \n## Coefficients:\n## (Intercept)            x  \n##      -3.421        1.838\n<\/pre>\n<pre><code class=\"r\">x &lt;- as.factor(x)\nlm(y~x)\n<\/code><\/pre>\n<pre>## \n## Call:\n## lm(formula = y ~ x)\n## \n## Coefficients:\n## (Intercept)           x2           x3  \n##     -0.6444      -1.6830       3.6753\n<\/pre>\n<p>\uc55e\uc758 \ub450 \ubd84\uc11d \uacb0\uacfc\uc758 \ucc28\uc774\ub294 \ub2e4\uc74c\uacfc \uac19\uc774 \uc2dc\uac01\uc801\uc73c\ub85c \ub098\ud0c0\ub0bc \uc218 \uc788\ub2e4. \uc880 \ub354 \uc790\uc138\ud55c \ub0b4\uc6a9\uc740 \ub370\uc774\ud130 \ubd84\uc11d \uad00\ub828 \ub3c4\uc11c\ub098 \uc774 \ucc45\uc758 \ub2e4\uc74c \uc2dc\ub9ac\uc988\uc778 <code>&lt;<\/code>R\ub85c \ud558\ub294 \ube45\ub370\uc774\ud130 \ubd84\uc11d: \ud1b5\uacc4 \ubd84\uc11d\uacfc \uae30\uacc4 \ud559\uc2b5<code>&gt;<\/code>\uc744 \ucc38\uc870\ud558\uc790.<\/p>\n<p><img src=\"data:image\/png;base64,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\" alt=\"plot of chunk unnamed-chunk-5\"\/><\/p>\n<h2>\ub370\uc774\ud130 \uc804\ucc98\ub9ac\uc5d0 \uc788\uc5b4\uc11c \ud329\ud130\ud615<\/h2>\n<p>\ud558\uc9c0\ub9cc \ud329\ud130\ud615\uc740 \ub370\uc774\ud130\ub97c \uc804\ucc98\ub9ac\ud558\uae30\uc5d0 \uae4c\ub2e4\ub86d\ub2e4\ub294 \ub2e8\uc810\uc774 \uc788\ub2e4. \uadf8\ub798\uc11c \uba87\uba87 \ubd84\uc11d\uac00\ub4e4\uc740 \ub370\uc774\ud130 \uc804\ucc98\ub9ac\ub97c \ud560 \ub54c\uc5d0\ub294 \ubb38\uc790\uc5f4\ud615\uc73c\ub85c \uc720\uc9c0\ub97c \ud558\ub2e4\uac00 \ubd84\uc11d \uc9c1\uc804\uc5d0 \ud329\ud130\ud615\uc73c\ub85c \ubcc0\ud658\ud558\ub77c\uace0 \uc870\uc5b8\ud55c\ub2e4. \uad6c\uccb4\uc801\uc73c\ub85c \ud329\ud130\ud615\uc740 \uc27d\uac8c \uc0c8\ub85c\uc6b4 \ubc94\uc8fc\ub97c \ucd94\uac00\ud558\uac70\ub098, \ubc94\uc8fc\uac00 \ub2e4\ub978 \ub450 \ud329\ud130\ub97c \ud569\uce60 \uc218 \uc5c6\ub2e4. \uc544\ub798\ub294 \ud329\ud130\ud615 <code>fac1<\/code>\uc758 \uacbd\uc6b0 \uae30\uc874\uc758 \uc218\uc900\uc778 <code>b<\/code>\ub97c 5\ubc88\uc9f8 \uc6d0\uc18c\ub85c \ucd94\uac00\ud558\ub294 \uac83\uc740 \uac00\ub2a5\ud558\uc9c0\ub9cc \uc0c8\ub85c\uc6b4 \uc218\uc900 <code>c<\/code>\ub97c 6\ubc88\uc9f8 \uc6d0\uc18c\ub97c \ucd94\uac00\ud560 \uc218 \uc5c6\uc74c\uc744 \ubcf4\uc5ec\uc900\ub2e4.[<sup>1]<\/sup><\/p>\n<pre><code class=\"r\">fac1 &lt;- factor(c(&#39;a&#39;, &#39;b&#39;, &#39;b&#39;, &#39;a&#39;))\nfac1[5] &lt;- &#39;b&#39;\nfac1[6] &lt;- &#39;c&#39;\n<\/code><\/pre>\n<pre>## Warning in `[&lt;-.factor`(`*tmp*`, 6, value = &quot;c&quot;): invalid factor level, NA\n## generated\n<\/pre>\n<pre><code class=\"r\">fac1\n<\/code><\/pre>\n<pre>## [1] a    b    b    a    b    &lt;NA&gt;\n## Levels: a b\n<\/pre>\n<p>[<sup>1]:<\/sup> \uc774\ub7f0 \ubb38\uc81c\uc810 \ub54c\ubb38\uc5d0 data.frame\uc744 \uc0dd\uc131\ud558\uac70\ub098 \ud654\uc77c\uc5d0\uc11c \ubd88\ub7ec\uc62c \ub54c <code>straingsAsFactors=FALSE<\/code>\ub85c \ub193\uae30\ub97c \uad8c\uc7a5\ud558\uae30\ub3c4 \ud55c\ub2e4. <\/p>\n<p>\ub2e4\uc74c\uc758 \uc608\ub294 \ub450 \ud329\ud130\ud615 \ubca1\ud130\ub97c \ud569\uce60 \ub54c\uc758 \ubb38\uc81c\uc810\uc744 \ubcf4\uc5ec\uc900\ub2e4.<\/p>\n<pre><code class=\"r\">fac1\n<\/code><\/pre>\n<pre>## [1] a    b    b    a    b    &lt;NA&gt;\n## Levels: a b\n<\/pre>\n<pre><code class=\"r\">fac2 &lt;- factor(c(&#39;a&#39;, &#39;b&#39;, &#39;c&#39;, &#39;c&#39;, &#39;b&#39;))\nc(fac1, fac2)\n<\/code><\/pre>\n<pre>##  [1]  1  2  2  1  2 NA  1  2  3  3  2\n<\/pre>\n<p><code>c(fac1, fac2)<\/code>\ub97c \ud1b5\ud574 \ud329\ud130\ud615 \ub450 \ubca1\ud130 <code>fac1<\/code>\uc640 <code>fac2<\/code>\ub97c \ud569\uce5c \uacb0\uacfc\ub294 \uc0dd\ub6b1\ub9de\uac8c <code>1<\/code>, <code>2<\/code> \ub4f1\uc758 \uc22b\uc790\uc774\ub2e4. \uc774\uac83\uc740 \ud329\ud130\ud615 \ub370\uc774\ud130 \ub0b4\ubd80\uc801\uc73c\ub85c \uc815\uc218\ub85c \ud45c\uae30\ub418\uae30 \ub54c\ubb38\uc774\ub2e4. \uc5b4\uca0b\ub4e0 \uc6b0\ub9ac\uac00 \uc6d0\ud588\ub358 \uacb0\uacfc\uac00 \uc544\ub2d8\uc740 \ubd84\uba85\ud558\ub2e4. <\/p>\n<p>\uc774\ub7f0 \ubb38\uc81c\uc810\uc744 \ud574\uacb0\ud558\uae30 \uc704\ud574 Hadley\ub294 <code>forcats<\/code>\ub77c\ub294 \ud328\ud0a4\uc9c0\ub97c \ub9cc\ub4e4\uc5c8\ub2e4. \uc5ec\uae30\uc11c\ub294 \uc774 \ud328\ud0a4\uc9c0\ub97c \ud65c\uc6a9\ud558\uc5ec \ud329\ud130\ud615 \ub370\uc774\ud130\ub97c \ub2e4\ub8e8\ub294 \ubc29\ubc95\uc744 \uc124\uba85\ud55c\ub2e4. \uc774\uc5d0 \ub300\ud55c \ub300\uc548\uc740 \uc55e\uc5d0\uc11c \ub9d0\ud588\ub4ef\uc774 \ud329\ud130\ud615 \ub370\uc774\ud130\ub97c \ubaa8\ub450 \ubb38\uc790\uc5f4\ub85c \ubc14\uafbc \ud6c4 \uc804\ucc98\ub9ac\ub97c \ud558\ub294 \uac83\uc774\ub2e4. \ubb38\uc790\uc5f4\uc758 \uacbd\uc6b0\uc5d0\ub294 \uc0c8\ub85c\uc6b4 \uc218\uc900\uc744 \ub3c4\uc785\ud558\uac70\ub098 \uc218\uc900\uc774 \ub2e4\ub978 \ub450 \uc790\ub8cc\ub97c \ud569\uce58\ub294 \ub370\uc5d0 \uc544\ubb34\ub7f0 \ubb38\uc81c\uac00 \uc5c6\ub2e4.[<sup>2]<\/sup><\/p>\n<pre><code class=\"r\">str1 &lt;- c(&#39;a&#39;, &#39;b&#39;, &#39;b&#39;, &#39;a&#39;)\nstr1[5] &lt;- &#39;c&#39;\nstr1\n<\/code><\/pre>\n<pre>## [1] &quot;a&quot; &quot;b&quot; &quot;b&quot; &quot;a&quot; &quot;c&quot;\n<\/pre>\n<pre><code class=\"r\">str2 &lt;- c(&#39;a&#39;, &#39;d&#39;, &#39;d&#39;, &#39;c&#39;)\nc(str1, str2)\n<\/code><\/pre>\n<pre>## [1] &quot;a&quot; &quot;b&quot; &quot;b&quot; &quot;a&quot; &quot;c&quot; &quot;a&quot; &quot;d&quot; &quot;d&quot; &quot;c&quot;\n<\/pre>\n<p>[<sup>2]:<\/sup> \ub9cc\uc57d \uc8fc\uc5b4\uc9c4 \uc790\ub8cc\uac00 \ud329\ud130\ud615\uc774\ub77c\uba74 <code>as.character()<\/code> \ud568\uc218\ub97c \ud1b5\ud574 \uc77c\ub2e8 \ubb38\uc790\ud615\uc73c\ub85c \ubc14\uafbc \ud6c4 \uc6d0\ud558\ub294 \uc791\uc5c5\uc744 \uc2e4\uc2dc\ud55c\ub2e4. \ud2b9\ud788 \ubc94\uc8fc\uac00 \uc22b\uc790\uc778 \ud329\ud130\ud615 \ubca1\ud130\ub97c \uc218\uce58\ud615 \ubca1\ud130\ub85c \ubcc0\ud658\ud560 \ub54c \uc8fc\uc758\ud574\uc57c \ud55c\ub2e4. <code>as.numeric(x)<\/code>\ub294 \uac70\uc758 \ud56d\uc0c1 \ud2c0\ub9b0 \ubc29\ubc95\uc774\ub2e4. <code>as.numeric(as.character(x))<\/code>\ub85c \ud574\uc57c \ud55c\ub2e4. \uc608\ub97c \ub4e4\uc5b4 \uc218\uc900\uc774 <code>1<\/code>, <code>10<\/code>, <code>100<\/code>\uc778 \ud329\ud130\ud615\uc5d0 \ub300\ud574 <code>as.numeric()<\/code>\uc744 \ud558\uba74 \uacb0\uacfc\uac00 <code>1<\/code>, <code>10<\/code>, <code>100<\/code>\uc774 \ub418\ub9ac\ub77c \uc608\uc0c1\ud558\uc9c0\ub9cc \uacb0\uacfc\ub294 <code>1<\/code>, <code>2<\/code>, <code>3<\/code>\uc774 \ub41c\ub2e4. \ubc18\uba74 <code>as.character()<\/code>\ub97c \ud558\uba74 \uacb0\uacfc\ub294 <code>&quot;1&quot;<\/code>, <code>&quot;10&quot;<\/code>, <code>&quot;100&quot;<\/code>\uc774\ub2e4.<\/p>\n<h2><code>forcats<\/code> \ud328\ud0a4\uc9c0<\/h2>\n<p><code>forcats<\/code> \ud328\ud0a4\uc9c0\ub294 <strong>FOR<\/strong> <strong>CAT<\/strong>egorical data(?)\ub780 \uc758\ubbf8\uc778 \ub4ef \ud558\ub2e4. \uc774 \ud328\ud0a4\uc9c0\uc758 \ud568\uc218\ub294 \ud06c\uac8c \ub2e4\uc74c\uacfc \uac19\uc774 \ubd84\ub958\ud560 \uc218 \uc788\ub2e4.<\/p>\n<ol>\n<li>\ud329\ud130\ud615\uc758 <strong>\uc218\uc900 \uc21c\uc11c<\/strong>\ub97c \ubc14\uafb8\ub294 \ud568\uc218<\/li>\n<li><strong>\uc218\uc900<\/strong>\uc744 \ud569\uce58\uac70\ub098 \uc774\ub984\uc744 \ubc14\uafb8\ub294 \ud568\uc218<\/li>\n<li><strong>\uc0c8\ub85c\uc6b4 \uc218\uc900<\/strong>\uc744 \ucd94\uac00\ud558\ub294 \ud568\uc218<\/li>\n<li>\uadf8 \ubc16\uc758 \ud568\uc218<\/li>\n<\/ol>\n<h3>\ud329\ud130\ud615\uc758 <strong>\uc218\uc900 \uc21c\uc11c<\/strong> \ubc14\uafb8\uae30<\/h3>\n<ul>\n<li><code>fct_relevel()<\/code> \ud568\uc218\ub97c \uc0ac\uc6a9\ud558\uc5ec \uc218\uc900\uc758 \uc21c\uc11c\ub97c \uc9c0\uc815\ud574 \uc904 \uc218 \uc788\ub2e4. \uc21c\uc11c\uac00 \uc9c0\uc815\ub41c \uc218\uc900 \uc678\uc5d0\ub294 \uae30\uc874\uc758 \uc21c\uc11c\uac00 \uc720\uc9c0\ub41c\ub2e4.<\/li>\n<\/ul>\n<pre><code class=\"r\">library(forcats)\nx &lt;- as.factor(x)\nx\n<\/code><\/pre>\n<pre>##  [1] 2 1 1 3 2 1 2 3 1 1 3 3 1 1 3 2 2 3 2 1 2 2 3 1 1 3 3 1 3 3\n## Levels: 1 2 3\n<\/pre>\n<pre><code class=\"r\">fct_relevel(x, &#39;3&#39;, &#39;2&#39;, &#39;1&#39;)\n<\/code><\/pre>\n<pre>##  [1] 2 1 1 3 2 1 2 3 1 1 3 3 1 1 3 2 2 3 2 1 2 2 3 1 1 3 3 1 3 3\n## Levels: 3 2 1\n<\/pre>\n<pre><code class=\"r\">fac2\n<\/code><\/pre>\n<pre>## [1] a b c c b\n## Levels: a b c\n<\/pre>\n<pre><code class=\"r\">fct_relevel(fac2, &#39;b&#39;, &#39;a&#39;)\n<\/code><\/pre>\n<pre>## [1] a b c c b\n## Levels: b a c\n<\/pre>\n<ul>\n<li>\uc0ac\uc2e4 \uc21c\uc704\uac00 \uc5c6\ub294 \ud329\ud130\uc758 \uacbd\uc6b0\uc5d0 \uc21c\uc11c\ub294 \ub370\uc774\ud130 \ubd84\uc11d\uc5d0\uc11c \ud070 \uc601\ud5a5\uc744 \ubbf8\uce58\uc9c0 \ubabb\ud55c\ub2e4. \ud558\uc9c0\ub9cc \uc790\ub8cc\ub97c \ubcf4\uae30 \uc2f6\uac8c \ucd9c\ub825\ud560 \ub54c\uc5d0\ub294 \ub3c4\uc6c0\uc744 \uc904 \uc218 \uc788\ub2e4. \ub2e4\uc74c\uc758 \ucf54\ub4dc\uc5d0\uc11c <code>fct_infreq<\/code>\ub294 \ubc94\uc8fc\ub97c \ucd9c\ud604 \ube48\ub3c4\uc21c\uc11c\ub85c \ubc30\uce58\ud568\uc73c\ub85c\uc368 <code>table()<\/code>\uc758 \uacb0\uacfc\ub97c \uc880 \ub354 \uc77d\uae30 \uc27d\uac8c \ud574\uc900\ub2e4.<\/li>\n<\/ul>\n<pre><code class=\"r\">x &lt;- factor(unlist(strsplit(\n  &#39;wzwzzwzwzcczwzdzczwzwzdzdddzdyydddddwzwwwdddzzddddzdzzd&#39;,&#39;&#39;\n)))\ntable(x)\n<\/code><\/pre>\n<pre>## x\n##  c  d  w  y  z \n##  3 20 11  2 19\n<\/pre>\n<pre><code class=\"r\">x &lt;- fct_infreq(x)\ntable(x)\n<\/code><\/pre>\n<pre>## x\n##  d  z  w  c  y \n## 20 19 11  3  2\n<\/pre>\n<p>\ud329\ud130\uc758 \ubc94\uc8fc \uc21c\uc11c\ub97c \ubc14\uafb8\ub294 \ud568\uc218\ub294 \uc774 \ubc16\uc5d0\ub3c4 <code>fct_reorder()<\/code>, <code>fct_reorder2()<\/code> \ub4f1\uc774 \uc788\ub2e4.<\/p>\n<h3><strong>\uc218\uc900<\/strong>\uc744 \ud569\uce58\uac70\ub098 \uc774\ub984\uc744 \ubc14\uafb8\ub294 \ud568\uc218<\/h3>\n<p>\ud329\ud130\uc758 \ubc94\uc8fc \uc774\ub984\uc744 \ubc14\uafb8\uace0 \uc2f6\ub2e4\uba74 <code>fct_recode()<\/code> \ud568\uc218\ub97c \uc0ac\uc6a9\ud55c\ub2e4. \uc55e\uc5d0\uc11c \uc758\ubbf8 \ubaa8\ub97c \ubb38\uc790\ub85c \uc774\ub8e8\uc5b4\uc84c\ub358 \ud329\ud130\ud615 \ubca1\ud130 <code>x<\/code>\uc758 \ubc94\uc8fc \uc774\ub984\uc744 \ub2e4\uc74c\uacfc \uac19\uc774 \uc758\ubbf8\uc788\ub294 \ub2e8\uc5b4\ub85c \ubc14\uafc0 \uc218 \uc788\ub2e4. <\/p>\n<pre><code class=\"r\"># dog=\uac1c, zebra=\uc5bc\ub8e9\ub9d0, whimbrel=\uc911\ubd80\ub9ac\ub3c4\uc694, catfish = \uba54\uae30, yak=\uc57c\ud06c\nx2 &lt;- fct_recode(x, \n                 &quot;dog&quot;=&quot;d&quot;, &quot;zebra&quot;=&quot;z&quot;, &quot;whimbrel&quot;=&quot;w&quot;,\n                 &quot;catfish&quot;=&quot;c&quot;, &quot;yak&quot;=&quot;y&quot;)\nx2\n<\/code><\/pre>\n<pre>##  [1] whimbrel zebra    whimbrel zebra    zebra    whimbrel zebra   \n##  [8] whimbrel zebra    catfish  catfish  zebra    whimbrel zebra   \n## [15] dog      zebra    catfish  zebra    whimbrel zebra    whimbrel\n## [22] zebra    dog      zebra    dog      dog      dog      zebra   \n## [29] dog      yak      yak      dog      dog      dog      dog     \n## [36] dog      whimbrel zebra    whimbrel whimbrel whimbrel dog     \n## [43] dog      dog      zebra    zebra    dog      dog      dog     \n## [50] dog      zebra    dog      zebra    zebra    dog     \n## Levels: dog zebra whimbrel catfish yak\n<\/pre>\n<ul>\n<li>\ub9cc\uc57d \ube44\uc2b7\ud55c \ubc94\uc8fc\ub97c \ubaa8\uc544 \ud55c \ubc94\uc8fc\ub85c \ubb36\uace0 \uc2f6\ub2e4\uba74 <code>fct_collapse()<\/code> \ud568\uc218\ub97c \uc0ac\uc6a9\ud55c\ub2e4. <\/li>\n<\/ul>\n<pre><code class=\"r\">x3 &lt;- fct_collapse(x2, \n                   &quot;mammals&quot;=c(&quot;dog&quot;, &quot;zebra&quot;, &quot;yak&quot;),\n                   &quot;birds&quot;=&quot;whimbrel&quot;,\n                   &quot;fish&quot;=&quot;catfish&quot;)\nx3\n<\/code><\/pre>\n<pre>##  [1] birds   mammals birds   mammals mammals birds   mammals birds  \n##  [9] mammals fish    fish    mammals birds   mammals mammals mammals\n## [17] fish    mammals birds   mammals birds   mammals mammals mammals\n## [25] mammals mammals mammals mammals mammals mammals mammals mammals\n## [33] mammals mammals mammals mammals birds   mammals birds   birds  \n## [41] birds   mammals mammals mammals mammals mammals mammals mammals\n## [49] mammals mammals mammals mammals mammals mammals mammals\n## Levels: mammals birds fish\n<\/pre>\n<ul>\n<li>\ub9c8\uc9c0\ub9c9\uc73c\ub85c \ubc94\uc8fc\uc758 \uac2f\uc218\uac00 \ub108\ubb34 \ub9ce\uc73c\uba74 \ub370\uc774\ud130 \ubd84\uc11d \uacb0\uacfc\uc758 \uc2e0\ub8b0\ub3c4\uac00 \ub0ae\uc544\uc9c8 \uc218 \uc788\ub2e4. \uc774\ub7f4 \ub54c\uc5d0\ub294 \ube44\uc728\uc774 \uc791\uc740 \ubc94\uc8fc\ub97c \ud558\ub098\uc758 \ubc94\uc8fc\ub85c \ubb36\ub294 \uac83\uc774 \uc88b\ub2e4. \ub2e4\uc74c\uc758 \ucf54\ub4dc\ub294 \ud329\ud130\ud615 \ubca1\ud130 <code>x2<\/code>\uc5d0\uc11c \uac00\uc7a5 \uc801\uc740 \ube44\uc728\uc744 \ucc28\uc9c0\ud558\ub294 \ubc94\uc8fc <code>whimbrel<\/code>, <code>catfish<\/code>, <code>yak<\/code>\ub97c <code>Others<\/code>\ub85c \ubb36\uc5b4\uc900\ub2e4.<\/li>\n<\/ul>\n<pre><code class=\"r\">x4 &lt;- fct_lump(x2); x4\n<\/code><\/pre>\n<pre>##  [1] Other zebra Other zebra zebra Other zebra Other zebra Other Other\n## [12] zebra Other zebra dog   zebra Other zebra Other zebra Other zebra\n## [23] dog   zebra dog   dog   dog   zebra dog   Other Other dog   dog  \n## [34] dog   dog   dog   Other zebra Other Other Other dog   dog   dog  \n## [45] zebra zebra dog   dog   dog   dog   zebra dog   zebra zebra dog  \n## Levels: dog zebra Other\n<\/pre>\n<h3><strong>\uc0c8\ub85c\uc6b4 \uc218\uc900<\/strong>\uc744 \ucd94\uac00\ud558\ub294 \ud568\uc218<\/h3>\n<ul>\n<li>\n<p><code>fct_expand()<\/code>\ub294 \uc8fc\uc5b4\uc9c4 \ud329\ud130\uc5d0 \uc0c8\ub85c\uc6b4 \ubc94\uc8fc\ub97c \ucd94\uac00\ud55c\ub2e4.<\/p>\n<\/li>\n<li>\n<p><code>fct_c()<\/code>\ub294 \ub450 \ud329\ud130 \ubca1\ud130\ub97c \ud569\uccd0\uc11c \uc0c8\ub85c\uc6b4 \ud329\ud130\ud615 \ubca1\ud130\ub97c \ub9cc\ub4e4\uc5b4\uc900\ub2e4.<\/p>\n<\/li>\n<\/ul>\n<pre><code class=\"r\">fac1; fac2\n<\/code><\/pre>\n<pre>## [1] a    b    b    a    b    &lt;NA&gt;\n## Levels: a b\n<\/pre>\n<pre>## [1] a b c c b\n## Levels: a b c\n<\/pre>\n<pre><code class=\"r\">c(fac1, fac2)\n<\/code><\/pre>\n<pre>##  [1]  1  2  2  1  2 NA  1  2  3  3  2\n<\/pre>\n<pre><code class=\"r\">fct_c(fac1, fac2)\n<\/code><\/pre>\n<pre>##  [1] a    b    b    a    b    &lt;NA&gt; a    b    c    c    b   \n## Levels: a b c\n<\/pre>\n<hr\/>\n<ul>\n<li>\uc774 \uae00\uc740 &ldquo;<a href=\"http:\/\/141.164.34.82\/?p=891\"><strong>R\ub85c \ud558\ub294 \ube45\ub370\uc774\ud130 \ubd84\uc11d: \ub370\uc774\ud130 \uc804\ucc98\ub9ac\uc640 \uc2dc\uac01\ud654<\/strong><\/a>&quot;\uc758 \uc77c\ubd80\ub97c \ubc1c\ucdcc\ud55c \uac83\uc785\ub2c8\ub2e4. <\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>\ud329\ud130 \uc790\ub8cc\ud615 &lt;\ucd9c\ucc98: Youtube\/Datacamp&gt; \ud329\ud130\ud615\uc740 \ubc94\uc8fc\ud615 \ub370\uc774\ud130\ub97c \uc800\uc7a5\ud558\ub294 \ub370 \uc0ac\uc6a9\ud55c\ub2e4. \ubc94\uc8fc\ud615 \ub370\uc774\ud130\ub294 \uc21c\uc704\ub97c \uc815\ud560 \uc218 \uc788\ub294 \uc21c\uc704\ud615 \ub370\uc774\ud130\uc640 \uc21c\uc704\uac00 \uc5c6\ub294 \ubc94\uc8fc\ud615 \ub370\uc774\ud130\ub85c \ub098\ub260 \uc218 \uc788\ub4ef\uc774 R\uc758 \ud329\ud130\ud615 \ub370\uc774\ud130\ub3c4 \uc21c\uc704\uac00 \uc788\ub294 \uc21c\uc704\ud615(ordered)\uacfc \uc21c\uc704\uac00 \uc5c6\ub294 \ud329\ud130\ud615(factor)\uc73c\ub85c \ub098\ub25c\ub2e4. \uc77c\ub2e8 \ud329\ud130\ud615\uacfc \uc21c\uc704\ud615 \ubca1\ud130\ub97c \ub9cc\ub4dc\ub09c \ubc29\ubc95\uc740 \ub2e4\uc74c\uacfc \uac19\ub2e4. x &lt;- factor(c(&#39;A&#39;, &#39;B&#39;, &#39;A&#39;, &#39;A&#39;, &#39;C&#39;, &#39;B&#39;)) x ## [1] A [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":1197,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[28,30],"tags":[270,275,274,273,272,271,269],"jetpack_featured_media_url":"http:\/\/ds.sumeun.org\/wp-content\/uploads\/2019\/05\/factors.png","_links":{"self":[{"href":"http:\/\/ds.sumeun.org\/index.php?rest_route=\/wp\/v2\/posts\/1193"}],"collection":[{"href":"http:\/\/ds.sumeun.org\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/ds.sumeun.org\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/ds.sumeun.org\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/ds.sumeun.org\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1193"}],"version-history":[{"count":7,"href":"http:\/\/ds.sumeun.org\/index.php?rest_route=\/wp\/v2\/posts\/1193\/revisions"}],"predecessor-version":[{"id":1201,"href":"http:\/\/ds.sumeun.org\/index.php?rest_route=\/wp\/v2\/posts\/1193\/revisions\/1201"}],"wp:featuredmedia":[{"embeddable":true,"href":"http:\/\/ds.sumeun.org\/index.php?rest_route=\/wp\/v2\/media\/1197"}],"wp:attachment":[{"href":"http:\/\/ds.sumeun.org\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1193"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/ds.sumeun.org\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1193"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/ds.sumeun.org\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1193"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}