{"id":1141,"date":"2023-07-27T12:44:55","date_gmt":"2023-07-27T12:44:55","guid":{"rendered":"https:\/\/statorials.org\/pt\/xtabs-em-r\/"},"modified":"2023-07-27T12:44:55","modified_gmt":"2023-07-27T12:44:55","slug":"xtabs-em-r","status":"publish","type":"post","link":"https:\/\/statorials.org\/pt\/xtabs-em-r\/","title":{"rendered":"Como usar xtabs() em r para calcular frequ\u00eancias"},"content":{"rendered":"<p><\/p>\n<hr>\n<p><span style=\"color: #000000;\">A fun\u00e7\u00e3o <strong>xtabs()<\/strong> em R permite calcular rapidamente as frequ\u00eancias de uma ou mais vari\u00e1veis.<\/span><\/p>\n<p> <span style=\"color: #000000;\">Ele usa a seguinte sintaxe b\u00e1sica:<\/span><\/p>\n<p> <span style=\"color: #000000;\"><strong>xtabs(~nome_vari\u00e1vel, dados=dados)<\/strong><\/span><\/p>\n<p> <span style=\"color: #000000;\">Ouro:<\/span><\/p>\n<ul>\n<li> <span style=\"color: #000000;\"><strong>nome_da_vari\u00e1vel:<\/strong> a vari\u00e1vel para a qual voc\u00ea deseja calcular frequ\u00eancias.<\/span><\/li>\n<li> <span style=\"color: #000000;\"><strong>dados:<\/strong> O nome do bloco de dados do qual a vari\u00e1vel vem.<\/span><\/li>\n<\/ul>\n<p> <span style=\"color: #000000;\">Este tutorial mostra v\u00e1rios exemplos de uso pr\u00e1tico desta fun\u00e7\u00e3o.<\/span><\/p>\n<h3> <span style=\"color: #000000;\"><strong>Exemplo 1: Use xtabs() para frequ\u00eancias unidirecionais<\/strong><\/span><\/h3>\n<p> <span style=\"color: #000000;\">O c\u00f3digo a seguir mostra como usar <strong>xtabs()<\/strong> para calcular frequ\u00eancias para a vari\u00e1vel <em>de equipe<\/em> :<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #008080;\">#create data frame<\/span>\ndf &lt;- data.frame(team= <span style=\"color: #3366ff;\">rep<\/span> (c(' <span style=\"color: #008000;\">A<\/span> ', ' <span style=\"color: #008000;\">B<\/span> ', ' <span style=\"color: #008000;\">C<\/span> '), <span style=\"color: #3366ff;\">times<\/span> =c(27, 33, 40)),\n                 position= <span style=\"color: #3366ff;\">rep<\/span> (c(' <span style=\"color: #008000;\">Guard<\/span> ', ' <span style=\"color: #008000;\">Forward<\/span> ', ' <span style=\"color: #008000;\">Center<\/span> '), <span style=\"color: #3366ff;\">times<\/span> =c(20, 50, 30)),\n                 points= <span style=\"color: #3366ff;\">runif<\/span> (100, 1, 50))\n\n<span style=\"color: #008080;\">#view first six rows of data frame\n<\/span>head(df)\n\n  team position points\n1A Guard 14.00992\n2 A Guard 19.23407\n3A Guard 29.06981\n4A Guard 45.50218\n5A Guard 10.88241\n6A Guard 45.02109\n\n<span style=\"color: #008080;\">#calculate frequencies of <em>team<\/em> variable\n<\/span>xtabs(~team, data=df)\n\nteam\n ABC\n27 33 40<\/strong><\/pre>\n<p> <span style=\"color: #000000;\">Pelo resultado podemos ver que:<\/span><\/p>\n<ul>\n<li> <span style=\"color: #000000;\">A equipe A aparece <strong>27<\/strong> vezes no quadro de dados.<\/span><\/li>\n<li> <span style=\"color: #000000;\">A equipe A aparece <strong>33<\/strong> vezes no quadro de dados.<\/span><\/li>\n<li> <span style=\"color: #000000;\">A equipe A aparece <strong>40<\/strong> vezes no quadro de dados.<\/span><\/li>\n<\/ul>\n<h3> <span style=\"color: #000000;\"><strong>Exemplo 2: Use xtabs() para frequ\u00eancias bidirecionais<\/strong><\/span><\/h3>\n<p> <span style=\"color: #000000;\">O c\u00f3digo a seguir mostra como usar <strong>xtabs()<\/strong> para calcular frequ\u00eancias bidirecionais para as vari\u00e1veis de <em>equipe<\/em> e <em>posi\u00e7\u00e3o<\/em> :<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #008080;\">#create data frame<\/span>\ndf &lt;- data.frame(team= <span style=\"color: #3366ff;\">rep<\/span> (c(' <span style=\"color: #008000;\">A<\/span> ', ' <span style=\"color: #008000;\">B<\/span> ', ' <span style=\"color: #008000;\">C<\/span> '), <span style=\"color: #3366ff;\">times<\/span> =c(27, 33, 40)),\n                 position= <span style=\"color: #3366ff;\">rep<\/span> (c(' <span style=\"color: #008000;\">Guard<\/span> ', ' <span style=\"color: #008000;\">Forward<\/span> ', ' <span style=\"color: #008000;\">Center<\/span> '), <span style=\"color: #3366ff;\">times<\/span> =c(20, 50, 30)),\n                 points= <span style=\"color: #3366ff;\">runif<\/span> (100, 1, 50))\n\n<span style=\"color: #008080;\">#calculate frequencies of <em>team<\/em> and <em>position<\/em> variables\n<\/span>xtabs(~team+position, data=df)\n\n    position\nteam Center Forward Guard\n   A 0 7 20\n   B 0 33 0\n   C 30 10 0<\/strong><\/pre>\n<p> <span style=\"color: #000000;\">Pelo resultado podemos ver que:<\/span><\/p>\n<ul>\n<li> <span style=\"color: #000000;\">Existem <strong>0<\/strong> Centros na Equipe A.<\/span><\/li>\n<li> <span style=\"color: #000000;\">Existem <strong>7<\/strong> atacantes na equipe A.<\/span><\/li>\n<li> <span style=\"color: #000000;\">Existem <strong>20<\/strong> guardas no Time A.<\/span><\/li>\n<\/ul>\n<p> <span style=\"color: #000000;\">E assim por diante.<\/span><\/p>\n<h3> <span style=\"color: #000000;\"><strong>Usando xtabs() para frequ\u00eancias de n vias<\/strong><\/span><\/h3>\n<p> <span style=\"color: #000000;\">A fun\u00e7\u00e3o <strong>xtabs()<\/strong> pode realmente ser usada para calcular as frequ\u00eancias de qualquer n\u00famero de vari\u00e1veis simplesmente usando a seguinte sintaxe:<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong>xtabs(~variable1+variable2+variable3+...+variable <em>n<\/em> , data=df)<\/strong><\/pre>\n<p> <span style=\"color: #000000;\">Na pr\u00e1tica, esta fun\u00e7\u00e3o \u00e9 mais frequentemente usada para calcular frequ\u00eancias unidirecionais e bidirecionais.<\/span><\/p>\n<h3> <span style=\"color: #000000;\"><strong>Recursos adicionais<\/strong><\/span><\/h3>\n<p> <a href=\"https:\/\/statorials.org\/pt\/frequencias-relativas-dplyr\/\" target=\"_blank\" rel=\"noopener noreferrer\">Como calcular frequ\u00eancias relativas usando dplyr<\/a><br \/> <a href=\"https:\/\/statorials.org\/pt\/conte-se-r\/\" target=\"_blank\" rel=\"noopener noreferrer\">Como executar uma fun\u00e7\u00e3o CONT.SE em R<\/a><br \/><a href=\"https:\/\/statorials.org\/pt\/soma-cumulativa-em-r\/\" target=\"_blank\" rel=\"noopener noreferrer\">Como calcular somas cumulativas em R<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>A fun\u00e7\u00e3o xtabs() em R permite calcular rapidamente as frequ\u00eancias de uma ou mais vari\u00e1veis. Ele usa a seguinte sintaxe b\u00e1sica: xtabs(~nome_vari\u00e1vel, dados=dados) Ouro: nome_da_vari\u00e1vel: a vari\u00e1vel para a qual voc\u00ea deseja calcular frequ\u00eancias. dados: O nome do bloco de dados do qual a vari\u00e1vel vem. Este tutorial mostra v\u00e1rios exemplos de uso pr\u00e1tico desta [&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-1141","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 usar xtabs() em R para calcular frequ\u00eancias \u2013 Estatoriais<\/title>\n<meta name=\"description\" content=\"Este tutorial explica como usar a fun\u00e7\u00e3o xtabs() em R para calcular frequ\u00eancias, 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\/xtabs-em-r\/\" \/>\n<meta property=\"og:locale\" content=\"pt_PT\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Como usar xtabs() em R para calcular frequ\u00eancias \u2013 Estatoriais\" \/>\n<meta property=\"og:description\" content=\"Este tutorial explica como usar a fun\u00e7\u00e3o xtabs() em R para calcular frequ\u00eancias, com v\u00e1rios exemplos.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/statorials.org\/pt\/xtabs-em-r\/\" \/>\n<meta property=\"og:site_name\" content=\"Statorials\" \/>\n<meta property=\"article:published_time\" content=\"2023-07-27T12:44:55+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=\"2 minutos\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/statorials.org\/pt\/xtabs-em-r\/\",\"url\":\"https:\/\/statorials.org\/pt\/xtabs-em-r\/\",\"name\":\"Como usar xtabs() em R para calcular frequ\u00eancias \u2013 Estatoriais\",\"isPartOf\":{\"@id\":\"https:\/\/statorials.org\/pt\/#website\"},\"datePublished\":\"2023-07-27T12:44:55+00:00\",\"dateModified\":\"2023-07-27T12:44:55+00:00\",\"author\":{\"@id\":\"https:\/\/statorials.org\/pt\/#\/schema\/person\/e08f98e8db95e0aa9c310e1b27c9c666\"},\"description\":\"Este tutorial explica como usar a fun\u00e7\u00e3o xtabs() em R para calcular frequ\u00eancias, com v\u00e1rios exemplos.\",\"breadcrumb\":{\"@id\":\"https:\/\/statorials.org\/pt\/xtabs-em-r\/#breadcrumb\"},\"inLanguage\":\"pt-PT\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/statorials.org\/pt\/xtabs-em-r\/\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/statorials.org\/pt\/xtabs-em-r\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Lar\",\"item\":\"https:\/\/statorials.org\/pt\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Como usar xtabs() em r para calcular frequ\u00eancias\"}]},{\"@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. Com vasta experi\u00eancia e conhecimento na \u00e1rea de estat\u00edstica, estou empenhado em compartilhar meu conhecimento para capacitar os alunos por meio de Statorials. Saber mais\",\"sameAs\":[\"https:\/\/statorials.org\/pt\"]}]}<\/script>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"Como usar xtabs() em R para calcular frequ\u00eancias \u2013 Estatoriais","description":"Este tutorial explica como usar a fun\u00e7\u00e3o xtabs() em R para calcular frequ\u00eancias, com v\u00e1rios exemplos.","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/statorials.org\/pt\/xtabs-em-r\/","og_locale":"pt_PT","og_type":"article","og_title":"Como usar xtabs() em R para calcular frequ\u00eancias \u2013 Estatoriais","og_description":"Este tutorial explica como usar a fun\u00e7\u00e3o xtabs() em R para calcular frequ\u00eancias, com v\u00e1rios exemplos.","og_url":"https:\/\/statorials.org\/pt\/xtabs-em-r\/","og_site_name":"Statorials","article_published_time":"2023-07-27T12:44:55+00:00","author":"Dr. benjamim anderson","twitter_card":"summary_large_image","twitter_misc":{"Escrito por":"Dr. benjamim anderson","Tempo estimado de leitura":"2 minutos"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"WebPage","@id":"https:\/\/statorials.org\/pt\/xtabs-em-r\/","url":"https:\/\/statorials.org\/pt\/xtabs-em-r\/","name":"Como usar xtabs() em R para calcular frequ\u00eancias \u2013 Estatoriais","isPartOf":{"@id":"https:\/\/statorials.org\/pt\/#website"},"datePublished":"2023-07-27T12:44:55+00:00","dateModified":"2023-07-27T12:44:55+00:00","author":{"@id":"https:\/\/statorials.org\/pt\/#\/schema\/person\/e08f98e8db95e0aa9c310e1b27c9c666"},"description":"Este tutorial explica como usar a fun\u00e7\u00e3o xtabs() em R para calcular frequ\u00eancias, com v\u00e1rios exemplos.","breadcrumb":{"@id":"https:\/\/statorials.org\/pt\/xtabs-em-r\/#breadcrumb"},"inLanguage":"pt-PT","potentialAction":[{"@type":"ReadAction","target":["https:\/\/statorials.org\/pt\/xtabs-em-r\/"]}]},{"@type":"BreadcrumbList","@id":"https:\/\/statorials.org\/pt\/xtabs-em-r\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Lar","item":"https:\/\/statorials.org\/pt\/"},{"@type":"ListItem","position":2,"name":"Como usar xtabs() em r para calcular frequ\u00eancias"}]},{"@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. Com vasta experi\u00eancia e conhecimento na \u00e1rea de estat\u00edstica, estou empenhado em compartilhar meu conhecimento para capacitar os alunos por meio de Statorials. Saber mais","sameAs":["https:\/\/statorials.org\/pt"]}]}},"yoast_meta":{"yoast_wpseo_title":"","yoast_wpseo_metadesc":"","yoast_wpseo_canonical":""},"_links":{"self":[{"href":"https:\/\/statorials.org\/pt\/wp-json\/wp\/v2\/posts\/1141","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/statorials.org\/pt\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/statorials.org\/pt\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/statorials.org\/pt\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/statorials.org\/pt\/wp-json\/wp\/v2\/comments?post=1141"}],"version-history":[{"count":0,"href":"https:\/\/statorials.org\/pt\/wp-json\/wp\/v2\/posts\/1141\/revisions"}],"wp:attachment":[{"href":"https:\/\/statorials.org\/pt\/wp-json\/wp\/v2\/media?parent=1141"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/statorials.org\/pt\/wp-json\/wp\/v2\/categories?post=1141"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/statorials.org\/pt\/wp-json\/wp\/v2\/tags?post=1141"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}