{"id":1088,"date":"2023-07-27T17:11:03","date_gmt":"2023-07-27T17:11:03","guid":{"rendered":"https:\/\/statorials.org\/pt\/r-media-por-grupo\/"},"modified":"2023-07-27T17:11:03","modified_gmt":"2023-07-27T17:11:03","slug":"r-media-por-grupo","status":"publish","type":"post","link":"https:\/\/statorials.org\/pt\/r-media-por-grupo\/","title":{"rendered":"Como calcular a m\u00e9dia do grupo em r (com exemplos)"},"content":{"rendered":"<p><\/p>\n<hr>\n<p><span style=\"color: #000000;\">Muitas vezes voc\u00ea pode querer calcular a m\u00e9dia do grupo em R. Voc\u00ea pode usar tr\u00eas m\u00e9todos para fazer isso:<\/span><\/p>\n<p> <span style=\"color: #000000;\"><strong>M\u00e9todo 1: Use base R.<\/strong><\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #000000;\">aggregate(df$col_to_aggregate, list(df$col_to_group_by), FUN= <span style=\"color: #3366ff;\">mean<\/span> )<\/span><\/strong><\/pre>\n<p> <span style=\"color: #000000;\"><strong>M\u00e9todo 2: Use o pacote dplyr().<\/strong><\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <span style=\"color: #000000;\"><b><span style=\"color: #993300;\">library<\/span> (dplyr)\n\ndf %&gt;%\n  <span style=\"color: #008000;\">group_by<\/span> (col_to_group_by) %&gt;%\n  <span style=\"color: #008000;\">summarise_at<\/span> (vars(col_to_aggregate), list(name = <span style=\"color: #3366ff;\">mean<\/span> ))\n<\/b><\/span><\/pre>\n<p> <span style=\"color: #000000;\"><strong>M\u00e9todo 3: Use o pacote data.table.<\/strong><\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <span style=\"color: #000000;\"><b><span style=\"color: #993300;\">library<\/span> (data.table)\n\ndt[ ,list(mean= <span style=\"color: #3366ff;\">mean<\/span> (col_to_aggregate)), by=col_to_group_by]\n<\/b><\/span><\/pre>\n<p> <span style=\"color: #000000;\">Os exemplos a seguir mostram como usar cada um desses m\u00e9todos na pr\u00e1tica.<\/span><\/p>\n<h3> <span style=\"color: #000000;\"><strong>M\u00e9todo 1: Calcular a m\u00e9dia por grupo usando a base R<\/strong><\/span><\/h3>\n<p> <span style=\"color: #000000;\">O c\u00f3digo a seguir mostra como usar a fun\u00e7\u00e3o <strong>Aggregate()<\/strong> do banco de dados R para calcular a m\u00e9dia de pontos marcados por equipe no seguinte quadro de dados:<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #000000;\"><span style=\"color: #008080;\">#create data frame<\/span><span style=\"color: #000000;\">\ndf &lt;- data.frame(team=c('a', 'a', 'b', 'b', 'b', 'c', 'c'),\n                 pts=c(5, 8, 14, 18, 5, 7, 7),\n                 rebs=c(8, 8, 9, 3, 8, 7, 4))\n\n<\/span><span style=\"color: #008080;\">#view data frame<\/span><span style=\"color: #000000;\">\ndf\n\n  team pts rebs\n1 to 5 8\n2 to 8 8\n3 b 14 9\n4 b 18 3\n5 b 5 8\n6 c 7 7\n7 c 7 4\n\n<\/span><span style=\"color: #008080;\">#find mean points scored by team\n<\/span><\/span><span style=\"color: #000000;\">aggregate(df$pts, list(df$team), FUN= <span style=\"color: #3366ff;\">mean<\/span> )\n\n  Group.1 x\n1 to 6.50000\n2 b 12.33333\n3 to 7.00000\n<\/span><\/strong><\/pre>\n<h3> <span style=\"color: #000000;\"><strong>M\u00e9todo 2: Calcule a m\u00e9dia por grupo usando dplyr<\/strong><\/span><\/h3>\n<p> <span style=\"color: #000000;\">O c\u00f3digo a seguir mostra como usar as fun\u00e7\u00f5es <strong>group_by<\/strong> <strong>()<\/strong> e <strong>summarise_at()<\/strong> do pacote <strong>dplyr<\/strong> para calcular a m\u00e9dia de pontos marcados por equipe no seguinte quadro de dados:<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #000000;\"><span style=\"color: #008080;\"><b><span style=\"color: #993300;\">library<\/span> <span style=\"color: #000000;\">(dplyr)<\/span><\/b>\n\n#create data frame<\/span>\ndf &lt;- data.frame(team=c('a', 'a', 'b', 'b', 'b', 'c', 'c'),\n                 pts=c(5, 8, 14, 18, 5, 7, 7),\n                 rebs=c(8, 8, 9, 3, 8, 7, 4))\n\n<span style=\"color: #008080;\">#find mean points scored by team<\/span>\n<b>df %&gt;%\n<span style=\"color: #008000;\">group_by<\/span> (team) %&gt;%\n<span style=\"color: #008000;\">summarise_at<\/span> (vars(pts), list(name = <span style=\"color: #3366ff;\">mean<\/span> ))\n\n# A tibble: 3 x 2\n  team name\n  &lt;fct&gt; &lt;dbl&gt;\n1 to 6.5\n2 b 12.3\n3 v 7<\/b>\n<\/span><\/strong><\/pre>\n<h3> <span style=\"color: #000000;\"><strong>M\u00e9todo 3: Calcular a m\u00e9dia por grupo usando data.table<\/strong><\/span><\/h3>\n<p> <span style=\"color: #000000;\">O c\u00f3digo a seguir mostra como calcular a m\u00e9dia de pontos marcados por equipe no seguinte quadro de dados:<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #000000;\"><span style=\"color: #008080;\"><b><span style=\"color: #993300;\">library<\/span> <span style=\"color: #000000;\">(data.table)<\/span><\/b>\n\n#create data frame<\/span>\ndf &lt;- data.frame(team=c('a', 'a', 'b', 'b', 'b', 'c', 'c'),\n                 pts=c(5, 8, 14, 18, 5, 7, 7),\n                 rebs=c(8, 8, 9, 3, 8, 7, 4))\n\n<span style=\"color: #008080;\">#convert data frame to data table<\/span> \nsetDT(df)\n\n<span style=\"color: #008080;\">#find mean points scored by team<\/span>\n<b>df[,list(mean= <span style=\"color: #3366ff;\">mean<\/span> (pts)), by=team]\n\n   team mean\n1: to 6.50000\n2:b12.33333\n3: c 7.00000<\/b><\/span><\/strong><\/pre>\n<p> <span style=\"color: #000000;\">Observe que todos os tr\u00eas m\u00e9todos retornam resultados id\u00eanticos.<\/span><\/p>\n<p> <span style=\"color: #000000;\"><strong>Relacionado:<\/strong> <a href=\"https:\/\/statorials.org\/pt\/funcao-media-em-r\/\" target=\"_blank\" rel=\"noopener\">Um guia completo para a fun\u00e7\u00e3o m\u00e9dia em R<\/a><\/span><\/p>\n<h3> <span style=\"color: #000000;\"><strong>Recursos adicionais<\/strong><\/span><\/h3>\n<p> <a href=\"https:\/\/statorials.org\/pt\/soma-por-grupo-em-r\/\" target=\"_blank\" rel=\"noopener\">Como calcular soma por grupo em R<\/a><br \/> <a href=\"https:\/\/statorials.org\/pt\/r-quantil-por-grupo\/\" target=\"_blank\" rel=\"noopener\">Como calcular quantis por grupo em R<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Muitas vezes voc\u00ea pode querer calcular a m\u00e9dia do grupo em R. Voc\u00ea pode usar tr\u00eas m\u00e9todos para fazer isso: M\u00e9todo 1: Use base R. aggregate(df$col_to_aggregate, list(df$col_to_group_by), FUN= mean ) M\u00e9todo 2: Use o pacote dplyr(). library (dplyr) df %&gt;% group_by (col_to_group_by) %&gt;% summarise_at (vars(col_to_aggregate), list(name = mean )) M\u00e9todo 3: Use o pacote data.table. [&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-1088","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 calcular a m\u00e9dia do grupo em R (com exemplos) - Estatologia<\/title>\n<meta name=\"description\" content=\"Este tutorial explica como calcular a m\u00e9dia do grupo 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\/r-media-por-grupo\/\" \/>\n<meta property=\"og:locale\" content=\"pt_PT\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Como calcular a m\u00e9dia do grupo em R (com exemplos) - Estatologia\" \/>\n<meta property=\"og:description\" content=\"Este tutorial explica como calcular a m\u00e9dia do grupo em R, com v\u00e1rios exemplos.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/statorials.org\/pt\/r-media-por-grupo\/\" \/>\n<meta property=\"og:site_name\" content=\"Statorials\" \/>\n<meta property=\"article:published_time\" content=\"2023-07-27T17:11:03+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=\"2 minutos\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/statorials.org\/pt\/r-media-por-grupo\/\",\"url\":\"https:\/\/statorials.org\/pt\/r-media-por-grupo\/\",\"name\":\"Como calcular a m\u00e9dia do grupo em R (com exemplos) - Estatologia\",\"isPartOf\":{\"@id\":\"https:\/\/statorials.org\/pt\/#website\"},\"datePublished\":\"2023-07-27T17:11:03+00:00\",\"dateModified\":\"2023-07-27T17:11:03+00:00\",\"author\":{\"@id\":\"https:\/\/statorials.org\/pt\/#\/schema\/person\/e08f98e8db95e0aa9c310e1b27c9c666\"},\"description\":\"Este tutorial explica como calcular a m\u00e9dia do grupo em R, com v\u00e1rios exemplos.\",\"breadcrumb\":{\"@id\":\"https:\/\/statorials.org\/pt\/r-media-por-grupo\/#breadcrumb\"},\"inLanguage\":\"pt-PT\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/statorials.org\/pt\/r-media-por-grupo\/\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/statorials.org\/pt\/r-media-por-grupo\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Lar\",\"item\":\"https:\/\/statorials.org\/pt\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Como calcular a m\u00e9dia do grupo 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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