{"id":1806,"date":"2023-07-24T22:10:03","date_gmt":"2023-07-24T22:10:03","guid":{"rendered":"https:\/\/statorials.org\/it\/creare-una-variabile-categoriale-in-r\/"},"modified":"2023-07-24T22:10:03","modified_gmt":"2023-07-24T22:10:03","slug":"creare-una-variabile-categoriale-in-r","status":"publish","type":"post","link":"https:\/\/statorials.org\/it\/creare-una-variabile-categoriale-in-r\/","title":{"rendered":"Come creare variabili categoriali in r (con esempi)"},"content":{"rendered":"<p><\/p>\n<hr>\n<p><span style=\"color: #000000;\">\u00c8 possibile utilizzare la seguente sintassi per creare una <a href=\"https:\/\/statorials.org\/it\/categorico-vs.-quantitativo\/\" target=\"_blank\" rel=\"noopener\">variabile categoriale<\/a> in 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;\">Gli esempi seguenti mostrano come utilizzare questa sintassi nella pratica.<\/span><\/p>\n<h3> <span style=\"color: #000000;\"><strong>Esempio 1: creare una variabile categoriale da zero<\/strong><\/span><\/h3>\n<p> <span style=\"color: #000000;\">Il codice seguente mostra come creare una variabile categoriale da 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$type &lt;- factor(c(' <span style=\"color: #ff0000;\">A<\/span> ', ' <span style=\"color: #ff0000;\">B<\/span> ', ' <span style=\"color: #ff0000;\">B<\/span> ', ' <span style=\"color: #ff0000;\">C<\/span> ', ' <span style=\"color: #ff0000;\">D<\/span> '))\n\n<span style=\"color: #008080;\">#view updated data frame\n<span style=\"color: #000000;\">df\n\n<\/span><\/span>var1 var2 var3 var4 type\n1 1 7 3 14 A\n2 3 7 3 16 B\n3 3 8 6 22 B\n4 4 3 10 19 C\n5 5 2 12 18 D\n<\/strong><\/pre>\n<h3> <span style=\"color: #000000;\"><strong>Esempio 2: creare una variabile categoriale (con due valori) da una variabile esistente<\/strong><\/span><\/h3>\n<p> <span style=\"color: #000000;\">Il codice seguente mostra come creare una variabile categoriale da una variabile esistente in un frame di dati:<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #008080;\">#create data frame\n<span style=\"color: #000000;\">df &lt;- data. <span style=\"color: #3366ff;\">frame<\/span> (var1=c(1, 3, 3, 4, 5),\n                 var2=c(7, 7, 8, 3, 2),\n                 var3=c(3, 3, 6, 10, 12),\n                 var4=c(14, 16, 22, 19, 18))\n\n<\/span>#view data frame\n<span style=\"color: #000000;\">df\n<\/span>\n<span style=\"color: #000000;\">var1 var2 var3 var4\n1 1 7 3 14\n2 3 7 3 16\n3 3 8 6 22\n4 4 3 10 19\n5 5 2 12 18<\/span>\n\n#add categorical variable named 'type' using values from 'var4' column<\/span>\ndf$type &lt;- as. <span style=\"color: #3366ff;\">factor<\/span> ( <span style=\"color: #3366ff;\">ifelse<\/span> (df$var1 &lt; 4, 1, 0))\n\n<span style=\"color: #008080;\">#view updated data frame\n<span style=\"color: #000000;\">df\n\n<\/span><\/span>var1 var2 var3 var4 type\n1 1 7 3 14 1\n2 3 7 3 16 1\n3 3 8 6 22 1\n4 4 3 10 19 0\n5 5 2 12 18 0<\/strong><\/pre>\n<p> <span style=\"color: #000000;\">Utilizzando l&#8217;istruzione <strong>ifelse()<\/strong> , abbiamo creato una nuova variabile categoriale chiamata &#8220;type&#8221; che accetta i seguenti valori:<\/span><\/p>\n<ul>\n<li> <span style=\"color: #000000;\"><strong>1<\/strong> se il valore della colonna &#8220;var1&#8221; \u00e8 inferiore a 4.<\/span><\/li>\n<li> <span style=\"color: #000000;\"><strong>0<\/strong> se il valore nella colonna &#8220;var1&#8221; non \u00e8 inferiore a 4.<\/span><\/li>\n<\/ul>\n<h3> <span style=\"color: #000000;\"><strong>Esempio 3: creare una variabile categoriale<\/strong><\/span> <span style=\"color: #000000;\"><strong>(con pi\u00f9 valori)<\/strong><\/span> <span style=\"color: #000000;\"><strong>da una variabile esistente<\/strong><\/span><\/h3>\n<p> <span style=\"color: #000000;\">Il codice seguente mostra come creare una variabile categoriale (con pi\u00f9 valori) da una variabile esistente in un frame di dati:<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #008080;\">#create data frame\n<span style=\"color: #000000;\">df &lt;- data. <span style=\"color: #3366ff;\">frame<\/span> (var1=c(1, 3, 3, 4, 5),\n                 var2=c(7, 7, 8, 3, 2),\n                 var3=c(3, 3, 6, 10, 12),\n                 var4=c(14, 16, 22, 19, 18))\n\n<\/span>#view data frame\n<span style=\"color: #000000;\">df\n<\/span>\n<span style=\"color: #000000;\">var1 var2 var3 var4\n1 1 7 3 14\n2 3 7 3 16\n3 3 8 6 22\n4 4 3 10 19\n5 5 2 12 18<\/span>\n\n#add categorical variable named 'type' using values from 'var4' column<\/span>\ndf$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;\">Utilizzando l&#8217;istruzione <strong>ifelse()<\/strong> , abbiamo creato una nuova variabile categoriale chiamata &#8220;type&#8221; che accetta i seguenti valori:<\/span><\/p>\n<ul>\n<li> <span style=\"color: #000000;\">&#8216; <strong>A<\/strong> &#8216; se il valore della colonna &#8216;var1&#8217; \u00e8 inferiore a 3.<\/span><\/li>\n<li> <span style=\"color: #000000;\">Altrimenti, &#8221; <strong>B<\/strong> &#8221; se il valore nella colonna &#8220;var1&#8221; \u00e8 inferiore a 4.<\/span><\/li>\n<li> <span style=\"color: #000000;\">Altrimenti, &#8221; <strong>C<\/strong> &#8221; se il valore nella colonna &#8220;var1&#8221; \u00e8 inferiore a 5.<\/span><\/li>\n<li> <span style=\"color: #000000;\">Altrimenti, &#8221; <strong>D<\/strong> &#8221; se il valore nella colonna &#8220;var1&#8221; \u00e8 inferiore a 6.<\/span><\/li>\n<li> <span style=\"color: #000000;\">Altrimenti, &#8216; <strong>E<\/strong> &#8216;.<\/span><\/li>\n<\/ul>\n<h3> <span style=\"color: #000000;\"><strong>Risorse addizionali<\/strong><\/span><\/h3>\n<p> <a href=\"https:\/\/statorials.org\/it\/variabili-fittizie-in-r\/\" target=\"_blank\" rel=\"noopener\">Come creare variabili fittizie in R<\/a><br \/> <a href=\"https:\/\/statorials.org\/it\/convertire-il-fattore-carattere-in-r\/\" target=\"_blank\" rel=\"noopener\">Come convertire un fattore in un carattere in R<\/a><br \/> <a href=\"https:\/\/statorials.org\/it\/carattere-numerico-in-r\/\" target=\"_blank\" rel=\"noopener\">Come convertire un carattere in numerico in R<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u00c8 possibile utilizzare la seguente sintassi per creare una variabile categoriale in 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":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v21.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Come creare variabili categoriali in R (con esempi)<\/title>\n<meta name=\"description\" content=\"Questo tutorial spiega come creare variabili categoriali in R, con diversi esempi.\" \/>\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\/it\/creare-una-variabile-categoriale-in-r\/\" \/>\n<meta property=\"og:locale\" content=\"it_IT\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Come creare variabili categoriali in R (con esempi)\" \/>\n<meta property=\"og:description\" content=\"Questo tutorial spiega come creare variabili categoriali in R, con diversi esempi.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/statorials.org\/it\/creare-una-variabile-categoriale-in-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=\"Benjamin anderson\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Benjamin anderson\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"3 minuti\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/statorials.org\/it\/creare-una-variabile-categoriale-in-r\/\",\"url\":\"https:\/\/statorials.org\/it\/creare-una-variabile-categoriale-in-r\/\",\"name\":\"Come creare variabili categoriali in R (con esempi)\",\"isPartOf\":{\"@id\":\"https:\/\/statorials.org\/it\/#website\"},\"datePublished\":\"2023-07-24T22:10:03+00:00\",\"dateModified\":\"2023-07-24T22:10:03+00:00\",\"author\":{\"@id\":\"https:\/\/statorials.org\/it\/#\/schema\/person\/0896f191fb9fb019f2cd8623112cb3ae\"},\"description\":\"Questo tutorial spiega come creare variabili categoriali in R, con diversi esempi.\",\"breadcrumb\":{\"@id\":\"https:\/\/statorials.org\/it\/creare-una-variabile-categoriale-in-r\/#breadcrumb\"},\"inLanguage\":\"it-IT\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/statorials.org\/it\/creare-una-variabile-categoriale-in-r\/\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/statorials.org\/it\/creare-una-variabile-categoriale-in-r\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Casa\",\"item\":\"https:\/\/statorials.org\/it\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Come creare variabili categoriali in r (con esempi)\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\/\/statorials.org\/it\/#website\",\"url\":\"https:\/\/statorials.org\/it\/\",\"name\":\"Statorials\",\"description\":\"La tua guida all&#039;alfabetizzazione statistica!\",\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\/\/statorials.org\/it\/?s={search_term_string}\"},\"query-input\":\"required name=search_term_string\"}],\"inLanguage\":\"it-IT\"},{\"@type\":\"Person\",\"@id\":\"https:\/\/statorials.org\/it\/#\/schema\/person\/0896f191fb9fb019f2cd8623112cb3ae\",\"name\":\"Benjamin anderson\",\"image\":{\"@type\":\"ImageObject\",\"inLanguage\":\"it-IT\",\"@id\":\"https:\/\/statorials.org\/it\/#\/schema\/person\/image\/\",\"url\":\"https:\/\/statorials.org\/it\/wp-content\/uploads\/2023\/10\/Dr.-Benjamin-Anderson-96x96.jpg\",\"contentUrl\":\"https:\/\/statorials.org\/it\/wp-content\/uploads\/2023\/10\/Dr.-Benjamin-Anderson-96x96.jpg\",\"caption\":\"Benjamin anderson\"},\"description\":\"Ciao, sono Benjamin, un professore di statistica in pensione diventato insegnante dedicato di Statorials. 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