{"id":1805,"date":"2023-07-24T22:10:03","date_gmt":"2023-07-24T22:10:03","guid":{"rendered":"https:\/\/statorials.org\/pt\/crie-uma-variavel-categorica-em-r\/"},"modified":"2023-07-24T22:10:03","modified_gmt":"2023-07-24T22:10:03","slug":"crie-uma-variavel-categorica-em-r","status":"publish","type":"post","link":"https:\/\/statorials.org\/pt\/crie-uma-variavel-categorica-em-r\/","title":{"rendered":"Como criar vari\u00e1veis categ\u00f3ricas em r (com exemplos)"},"content":{"rendered":"<p><\/p>\n<hr>\n<p><span style=\"color: #000000;\">Voc\u00ea pode usar a seguinte sintaxe para criar uma <a href=\"https:\/\/statorials.org\/pt\/categorico-vs.-quantitativo\/\" target=\"_blank\" rel=\"noopener\">vari\u00e1vel categ\u00f3rica<\/a> em R:<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #008080;\">#create categorical variable from scratch<\/span>\ncat_variable &lt;- factor(c(' <span style=\"color: #ff0000;\">A<\/span> ', ' <span style=\"color: #ff0000;\">B<\/span> ', ' <span style=\"color: #ff0000;\">C<\/span> ', ' <span style=\"color: #ff0000;\">D<\/span> '))\n\n<span style=\"color: #008080;\">#create categorical variable (with two possible values) from existing variable\n<\/span>cat_variable &lt;- as. <span style=\"color: #3366ff;\">factor<\/span> ( <span style=\"color: #3366ff;\">ifelse<\/span> (existing_variable &lt; 4, 1, 0))\n\n<span style=\"color: #008080;\">#create categorical variable (with multiple possible values) from existing variable\n<\/span><span style=\"color: #000000;\">cat_variable<\/span> &lt;- as. <span style=\"color: #3366ff;\">factor<\/span> ( <span style=\"color: #3366ff;\">ifelse<\/span> (existing_variable &lt; 3, ' <span style=\"color: #ff0000;\">A<\/span> ',\n                          <span style=\"color: #3366ff;\">ifelse<\/span> (existing_variable &lt; 4, ' <span style=\"color: #ff0000;\">B<\/span> ', \n                          <span style=\"color: #3366ff;\">ifelse<\/span> (existing_variable &lt; 5, ' <span style=\"color: #ff0000;\">C<\/span> ', \n                          <span style=\"color: #3366ff;\">ifelse<\/span> (existing_variable &lt; 6, ' <span style=\"color: #ff0000;\">D<\/span> ',0)))))\n<\/strong><\/pre>\n<p> <span style=\"color: #000000;\">Os exemplos a seguir mostram como usar essa sintaxe na pr\u00e1tica.<\/span><\/p>\n<h3> <span style=\"color: #000000;\"><strong>Exemplo 1: Crie uma vari\u00e1vel categ\u00f3rica do zero<\/strong><\/span><\/h3>\n<p> <span style=\"color: #000000;\">O c\u00f3digo a seguir mostra como criar uma vari\u00e1vel categ\u00f3rica do zero:<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #008080;\">#create data frame\n<span style=\"color: #000000;\">df &lt;- data. <span style=\"color: #3366ff;\">frame<\/span> (var1=c(1, 3, 3, 4, 5),\n                 var2=c(7, 7, 8, 3, 2),\n                 var3=c(3, 3, 6, 10, 12),\n                 var4=c(14, 16, 22, 19, 18))\n\n<\/span>#view data frame\n<span style=\"color: #000000;\">df\n<\/span>\n<span style=\"color: #000000;\">var1 var2 var3 var4\n1 1 7 3 14\n2 3 7 3 16\n3 3 8 6 22\n4 4 3 10 19\n5 5 2 12 18<\/span>\n\n#add categorical variable named 'type' to data frame<\/span>\ndf$type &lt;- factor(c(' <span style=\"color: #ff0000;\">A<\/span> ', ' <span style=\"color: #ff0000;\">B<\/span> ', ' <span style=\"color: #ff0000;\">B<\/span> ', ' <span style=\"color: #ff0000;\">C<\/span> ', ' <span style=\"color: #ff0000;\">D<\/span> '))\n\n<span style=\"color: #008080;\">#view updated data frame\n<span style=\"color: #000000;\">df\n\n<\/span><\/span>var1 var2 var3 var4 type\n1 1 7 3 14 A\n2 3 7 3 16 B\n3 3 8 6 22 B\n4 4 3 10 19 C\n5 5 2 12 18 D\n<\/strong><\/pre>\n<h3> <span style=\"color: #000000;\"><strong>Exemplo 2: Crie uma vari\u00e1vel categ\u00f3rica (com dois valores) a partir de uma vari\u00e1vel existente<\/strong><\/span><\/h3>\n<p> <span style=\"color: #000000;\">O c\u00f3digo a seguir mostra como criar uma vari\u00e1vel categ\u00f3rica a partir de uma vari\u00e1vel existente em um quadro de dados:<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #008080;\">#create data frame\n<span style=\"color: #000000;\">df &lt;- data. <span style=\"color: #3366ff;\">frame<\/span> (var1=c(1, 3, 3, 4, 5),\n                 var2=c(7, 7, 8, 3, 2),\n                 var3=c(3, 3, 6, 10, 12),\n                 var4=c(14, 16, 22, 19, 18))\n\n<\/span>#view data frame\n<span style=\"color: #000000;\">df\n<\/span>\n<span style=\"color: #000000;\">var1 var2 var3 var4\n1 1 7 3 14\n2 3 7 3 16\n3 3 8 6 22\n4 4 3 10 19\n5 5 2 12 18<\/span>\n\n#add categorical variable named 'type' using values from 'var4' column<\/span>\ndf$type &lt;- as. <span style=\"color: #3366ff;\">factor<\/span> ( <span style=\"color: #3366ff;\">ifelse<\/span> (df$var1 &lt; 4, 1, 0))\n\n<span style=\"color: #008080;\">#view updated data frame\n<span style=\"color: #000000;\">df\n\n<\/span><\/span>var1 var2 var3 var4 type\n1 1 7 3 14 1\n2 3 7 3 16 1\n3 3 8 6 22 1\n4 4 3 10 19 0\n5 5 2 12 18 0<\/strong><\/pre>\n<p> <span style=\"color: #000000;\">Usando a instru\u00e7\u00e3o <strong>ifelse()<\/strong> , criamos uma nova vari\u00e1vel categ\u00f3rica chamada \u201ctype\u201d que assume os seguintes valores:<\/span><\/p>\n<ul>\n<li> <span style=\"color: #000000;\"><strong>1<\/strong> se o valor da coluna &#8216;var1&#8217; for menor que 4.<\/span><\/li>\n<li> <span style=\"color: #000000;\"><strong>0<\/strong> se o valor na coluna &#8216;var1&#8217; n\u00e3o for menor que 4.<\/span><\/li>\n<\/ul>\n<h3> <span style=\"color: #000000;\"><strong>Exemplo 3: Crie uma vari\u00e1vel categ\u00f3rica<\/strong><\/span> <span style=\"color: #000000;\"><strong>(com v\u00e1rios valores)<\/strong><\/span> <span style=\"color: #000000;\"><strong>a partir de uma vari\u00e1vel existente<\/strong><\/span><\/h3>\n<p> <span style=\"color: #000000;\">O c\u00f3digo a seguir mostra como criar uma vari\u00e1vel categ\u00f3rica (com v\u00e1rios valores) a partir de uma vari\u00e1vel existente em um quadro de dados:<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #008080;\">#create data frame\n<span style=\"color: #000000;\">df &lt;- data. <span style=\"color: #3366ff;\">frame<\/span> (var1=c(1, 3, 3, 4, 5),\n                 var2=c(7, 7, 8, 3, 2),\n                 var3=c(3, 3, 6, 10, 12),\n                 var4=c(14, 16, 22, 19, 18))\n\n<\/span>#view data frame\n<span style=\"color: #000000;\">df\n<\/span>\n<span style=\"color: #000000;\">var1 var2 var3 var4\n1 1 7 3 14\n2 3 7 3 16\n3 3 8 6 22\n4 4 3 10 19\n5 5 2 12 18<\/span>\n\n#add categorical variable named 'type' using values from 'var4' column<\/span>\ndf$type &lt;- as. <span style=\"color: #3366ff;\">factor<\/span> ( <span style=\"color: #3366ff;\">ifelse<\/span> (df$var1 &lt; 3, ' <span style=\"color: #ff0000;\">A<\/span> ',\n                     <span style=\"color: #3366ff;\">ifelse<\/span> (df$var1 &lt; 4, ' <span style=\"color: #ff0000;\">B<\/span> ', \n                     <span style=\"color: #3366ff;\">ifelse<\/span> (df$var1 &lt; 5, ' <span style=\"color: #ff0000;\">C<\/span> ', \n                     <span style=\"color: #3366ff;\">ifelse<\/span> (df$var1 &lt; 6, ' <span style=\"color: #ff0000;\">D<\/span> ', ' <span style=\"color: #ff0000;\">E<\/span> ')))))\n\n<span style=\"color: #008080;\">#view updated data frame\n<span style=\"color: #000000;\">df\n\n<\/span><\/span>var1 var2 var3 var4 type\n1 1 7 3 14 A\n2 3 7 3 16 B\n3 3 8 6 22 B\n4 4 3 10 19 C\n5 5 2 12 18 D<\/strong><\/pre>\n<p> <span style=\"color: #000000;\">Usando a instru\u00e7\u00e3o <strong>ifelse()<\/strong> , criamos uma nova vari\u00e1vel categ\u00f3rica chamada \u201ctype\u201d que assume os seguintes valores:<\/span><\/p>\n<ul>\n<li> <span style=\"color: #000000;\">&#8216; <strong>A<\/strong> &#8216; se o valor da coluna &#8216;var1&#8217; for menor que 3.<\/span><\/li>\n<li> <span style=\"color: #000000;\">Caso contr\u00e1rio, &#8216; <strong>B<\/strong> &#8216; se o valor na coluna &#8216;var1&#8217; for menor que 4.<\/span><\/li>\n<li> <span style=\"color: #000000;\">Caso contr\u00e1rio, &#8216; <strong>C<\/strong> &#8216; se o valor na coluna &#8216;var1&#8217; for menor que 5.<\/span><\/li>\n<li> <span style=\"color: #000000;\">Caso contr\u00e1rio, &#8216; <strong>D<\/strong> &#8216; se o valor na coluna &#8216;var1&#8217; for menor que 6.<\/span><\/li>\n<li> <span style=\"color: #000000;\">Caso contr\u00e1rio, &#8216; <strong>E<\/strong> &#8216;.<\/span><\/li>\n<\/ul>\n<h3> <span style=\"color: #000000;\"><strong>Recursos adicionais<\/strong><\/span><\/h3>\n<p> <a href=\"https:\/\/statorials.org\/pt\/variaveis-ficticias-em-r\/\" target=\"_blank\" rel=\"noopener\">Como criar vari\u00e1veis fict\u00edcias em R<\/a><br \/> <a href=\"https:\/\/statorials.org\/pt\/converter-fator-de-caractere-para-r\/\" target=\"_blank\" rel=\"noopener\">Como converter fator em caractere em R<\/a><br \/> <a href=\"https:\/\/statorials.org\/pt\/caractere-numerico-em-r\/\" target=\"_blank\" rel=\"noopener\">Como converter caractere em num\u00e9rico em R<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Voc\u00ea pode usar a seguinte sintaxe para criar uma vari\u00e1vel categ\u00f3rica em R: #create categorical variable from scratch cat_variable &lt;- factor(c(&#8216; A &#8216;, &#8216; B &#8216;, &#8216; C &#8216;, &#8216; D &#8216;)) #create categorical variable (with two possible values) from existing variable cat_variable &lt;- as. factor ( ifelse (existing_variable &lt; 4, 1, 0)) #create categorical [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[11],"tags":[],"class_list":["post-1805","post","type-post","status-publish","format-standard","hentry","category-guia"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v21.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Como criar vari\u00e1veis categ\u00f3ricas em R (com exemplos)<\/title>\n<meta name=\"description\" content=\"Este tutorial explica como criar vari\u00e1veis categ\u00f3ricas em R, com v\u00e1rios exemplos.\" \/>\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\/pt\/crie-uma-variavel-categorica-em-r\/\" \/>\n<meta property=\"og:locale\" content=\"pt_PT\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Como criar vari\u00e1veis categ\u00f3ricas em R (com exemplos)\" \/>\n<meta property=\"og:description\" content=\"Este tutorial explica como criar vari\u00e1veis categ\u00f3ricas em R, com v\u00e1rios exemplos.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/statorials.org\/pt\/crie-uma-variavel-categorica-em-r\/\" \/>\n<meta property=\"og:site_name\" content=\"Statorials\" \/>\n<meta property=\"article:published_time\" content=\"2023-07-24T22:10:03+00:00\" \/>\n<meta name=\"author\" content=\"Dr. benjamim anderson\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Escrito por\" \/>\n\t<meta name=\"twitter:data1\" content=\"Dr. benjamim anderson\" \/>\n\t<meta name=\"twitter:label2\" content=\"Tempo estimado de leitura\" \/>\n\t<meta name=\"twitter:data2\" content=\"3 minutos\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/statorials.org\/pt\/crie-uma-variavel-categorica-em-r\/\",\"url\":\"https:\/\/statorials.org\/pt\/crie-uma-variavel-categorica-em-r\/\",\"name\":\"Como criar vari\u00e1veis categ\u00f3ricas em R (com exemplos)\",\"isPartOf\":{\"@id\":\"https:\/\/statorials.org\/pt\/#website\"},\"datePublished\":\"2023-07-24T22:10:03+00:00\",\"dateModified\":\"2023-07-24T22:10:03+00:00\",\"author\":{\"@id\":\"https:\/\/statorials.org\/pt\/#\/schema\/person\/e08f98e8db95e0aa9c310e1b27c9c666\"},\"description\":\"Este tutorial explica como criar vari\u00e1veis categ\u00f3ricas em R, com v\u00e1rios exemplos.\",\"breadcrumb\":{\"@id\":\"https:\/\/statorials.org\/pt\/crie-uma-variavel-categorica-em-r\/#breadcrumb\"},\"inLanguage\":\"pt-PT\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/statorials.org\/pt\/crie-uma-variavel-categorica-em-r\/\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/statorials.org\/pt\/crie-uma-variavel-categorica-em-r\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Lar\",\"item\":\"https:\/\/statorials.org\/pt\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Como criar vari\u00e1veis categ\u00f3ricas em r (com exemplos)\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\/\/statorials.org\/pt\/#website\",\"url\":\"https:\/\/statorials.org\/pt\/\",\"name\":\"Statorials\",\"description\":\"O seu guia para a literacia estat\u00edstica!\",\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\/\/statorials.org\/pt\/?s={search_term_string}\"},\"query-input\":\"required name=search_term_string\"}],\"inLanguage\":\"pt-PT\"},{\"@type\":\"Person\",\"@id\":\"https:\/\/statorials.org\/pt\/#\/schema\/person\/e08f98e8db95e0aa9c310e1b27c9c666\",\"name\":\"Dr. benjamim anderson\",\"image\":{\"@type\":\"ImageObject\",\"inLanguage\":\"pt-PT\",\"@id\":\"https:\/\/statorials.org\/pt\/#\/schema\/person\/image\/\",\"url\":\"https:\/\/statorials.org\/pt\/wp-content\/uploads\/2023\/10\/Dr.-Benjamin-Anderson-96x96.jpg\",\"contentUrl\":\"https:\/\/statorials.org\/pt\/wp-content\/uploads\/2023\/10\/Dr.-Benjamin-Anderson-96x96.jpg\",\"caption\":\"Dr. benjamim anderson\"},\"description\":\"Ol\u00e1, sou Benjamin, um professor aposentado de estat\u00edstica que se tornou professor dedicado na Statorials. 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