{"id":3285,"date":"2023-07-18T07:13:50","date_gmt":"2023-07-18T07:13:50","guid":{"rendered":"https:\/\/statorials.org\/pt\/dplyr-resume-multiplas-colunas\/"},"modified":"2023-07-18T07:13:50","modified_gmt":"2023-07-18T07:13:50","slug":"dplyr-resume-multiplas-colunas","status":"publish","type":"post","link":"https:\/\/statorials.org\/pt\/dplyr-resume-multiplas-colunas\/","title":{"rendered":"Como resumir m\u00faltiplas colunas usando dplyr"},"content":{"rendered":"<p><\/p>\n<hr>\n<p><span style=\"color: #000000;\">Voc\u00ea pode usar os seguintes m\u00e9todos para resumir v\u00e1rias colunas em um quadro de dados usando dplyr:<\/span><\/p>\n<p> <span style=\"color: #000000;\"><strong>M\u00e9todo 1: resumir todas as colunas<\/strong><\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #008080;\">#summarize mean of all columns<\/span>\ndf %&gt;%\n  group_by(group_var) %&gt;%\n  summarise(across(everything(), mean, na. <span style=\"color: #3366ff;\">rm<\/span> = <span style=\"color: #008000;\">TRUE<\/span> ))\n<\/strong><\/pre>\n<p> <span style=\"color: #000000;\"><strong>M\u00e9todo 2: resumir colunas espec\u00edficas<\/strong><\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #008080;\">#summarize mean of col1 and col2 only<\/span>\ndf %&gt;%\n  group_by(group_var) %&gt;%\n  summarise(across(c(col1, col2), mean, na. <span style=\"color: #3366ff;\">rm<\/span> = <span style=\"color: #008000;\">TRUE<\/span> ))\n<\/strong><\/pre>\n<p> <span style=\"color: #000000;\"><strong>M\u00e9todo 3: resumir todas as colunas num\u00e9ricas<\/strong><\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #008080;\">#summarize mean and standard deviation of all numeric columns\n<\/span>df %&gt;%\n  group_by(group_var) %&gt;%\n  summarise(across(where(is. <span style=\"color: #3366ff;\">numeric<\/span> ), list(mean=mean, sd=sd), na. <span style=\"color: #3366ff;\">rm<\/span> = <span style=\"color: #008000;\">TRUE<\/span> ))\n<\/strong><\/pre>\n<p> <span style=\"color: #000000;\">Os exemplos a seguir mostram como usar cada m\u00e9todo com o seguinte quadro de dados:<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #008080;\">#create data frame\n<\/span>df &lt;- data. <span style=\"color: #3366ff;\">frame<\/span> (team=c('A', 'A', 'A', 'B', 'B', 'B'),\n                 points=c(99, 90, 86, 88, 95, 90),\n                 assists=c(33, 28, 31, 39, 34, 25),\n                 rebounds=c(NA, 28, 24, 24, 28, 19))\n\n<span style=\"color: #008080;\">#view data frame\n<\/span>df\n\n  team points assists rebounds\n1 A 99 33 NA\n2 A 90 28 28\n3 A 86 31 24\n4 B 88 39 24\n5 B 95 34 28\n6 B 90 25 19\n<\/strong><\/pre>\n<h2> <span style=\"color: #000000;\"><strong>Exemplo 1: resumir todas as colunas<\/strong><\/span><\/h2>\n<p> <span style=\"color: #000000;\">O c\u00f3digo a seguir mostra como resumir a m\u00e9dia de todas as colunas:<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #008080;\"><span style=\"color: #000000;\"><span style=\"color: #008000;\">library<\/span> (dplyr)<\/span>\n\n#summarize mean of all columns, grouped by team<\/span>\ndf %&gt;%\n  group_by(team) %&gt;%\n  summarise(across(everything(), mean, na. <span style=\"color: #3366ff;\">rm<\/span> = <span style=\"color: #008000;\">TRUE<\/span> ))\n\n# A tibble: 2 x 4\n  team points assists rebounds\n           \n1 A 91.7 30.7 26  \n2 B 91 32.7 23.7\n<\/strong><\/pre>\n<h2> <span style=\"color: #000000;\"><strong>Exemplo 2: resumir colunas espec\u00edficas<\/strong><\/span><\/h2>\n<p> <span style=\"color: #000000;\">O c\u00f3digo a seguir mostra como resumir a m\u00e9dia apenas das colunas de <strong>pontos<\/strong> e <strong>rebotes<\/strong> :<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #008080;\"><span style=\"color: #000000;\"><span style=\"color: #008000;\">library<\/span> (dplyr)<\/span>\n\n#summarize mean of points and rebounds, grouped by team<\/span>\ndf %&gt;%\n  group_by(team) %&gt;%\n  summarise(across(c(points, rebounds), mean, na. <span style=\"color: #3366ff;\">rm<\/span> = <span style=\"color: #008000;\">TRUE<\/span> ))\n\n# A tibble: 2 x 3\n  team points rebounds\n        \n1 A 91.7 26  \n2 B 91 23.7<\/strong><\/pre>\n<h2> <span style=\"color: #000000;\"><strong>Exemplo 3: resumir todas as colunas num\u00e9ricas<\/strong><\/span><\/h2>\n<p> <span style=\"color: #000000;\">O c\u00f3digo a seguir mostra como resumir a m\u00e9dia e o desvio padr\u00e3o de todas as colunas num\u00e9ricas no quadro de dados:<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #008080;\"><span style=\"color: #000000;\"><span style=\"color: #008000;\">library<\/span> (dplyr)<\/span>\n\n#summarize mean and standard deviation of all numeric columns<\/span>\ndf %&gt;%\n  group_by(team) %&gt;%\n  summarise(across(where(is. <span style=\"color: #3366ff;\">numeric<\/span> ), list(mean=mean, sd=sd), na. <span style=\"color: #3366ff;\">rm<\/span> = <span style=\"color: #008000;\">TRUE<\/span> ))\n\n# A tibble: 2 x 7\n  team points_mean points_sd assists_mean assists_sd rebounds_mean rebounds_sd\n                                            \n1 A 91.7 6.66 30.7 2.52 26 2.83\n2 B 91 3.61 32.7 7.09 23.7 4.51<\/strong><\/pre>\n<p> <span style=\"color: #000000;\">A sa\u00edda exibe a m\u00e9dia e o desvio padr\u00e3o de todas as vari\u00e1veis num\u00e9ricas no quadro de dados.<\/span><\/p>\n<p> <span style=\"color: #000000;\">Observe que neste exemplo usamos a fun\u00e7\u00e3o <strong>list()<\/strong> para listar v\u00e1rias estat\u00edsticas resumidas que quer\u00edamos calcular.<\/span><\/p>\n<p> <span style=\"color: #000000;\"><strong>Nota<\/strong> : Em cada exemplo, usamos a fun\u00e7\u00e3o dplyr <strong>across()<\/strong> . Voc\u00ea pode encontrar a documenta\u00e7\u00e3o completa para esta fun\u00e7\u00e3o <a href=\"https:\/\/dplyr.tidyverse.org\/reference\/across.html\" target=\"_blank\" rel=\"noopener\">aqui<\/a> .<\/span><\/p>\n<h2> <span style=\"color: #000000;\"><strong>Recursos adicionais<\/strong><\/span><\/h2>\n<p> <span style=\"color: #000000;\">Os tutoriais a seguir explicam como executar outras fun\u00e7\u00f5es comuns usando dplyr:<\/span><\/p>\n<p> <a href=\"https:\/\/statorials.org\/pt\/dplyr-excluir-linhas\/\" target=\"_blank\" rel=\"noopener\">Como deletar linhas usando dplyr<\/a><br \/> <a href=\"https:\/\/statorials.org\/pt\/organize-as-linhas-r\/\" target=\"_blank\" rel=\"noopener\">Como organizar linhas usando dplyr<\/a><br \/> Como filtrar por m\u00faltiplas condi\u00e7\u00f5es usando dplyr<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Voc\u00ea pode usar os seguintes m\u00e9todos para resumir v\u00e1rias colunas em um quadro de dados usando dplyr: M\u00e9todo 1: resumir todas as colunas #summarize mean of all columns df %&gt;% group_by(group_var) %&gt;% summarise(across(everything(), mean, na. rm = TRUE )) M\u00e9todo 2: resumir colunas espec\u00edficas #summarize mean of col1 and col2 only df %&gt;% group_by(group_var) %&gt;% [&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-3285","post","type-post","status-publish","format-standard","hentry","category-guia"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v21.5 - 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