{"id":4190,"date":"2023-07-12T23:54:51","date_gmt":"2023-07-12T23:54:51","guid":{"rendered":"https:\/\/statorials.org\/pt\/estatisticas-resumidas-em-r-dplyr\/"},"modified":"2023-07-12T23:54:51","modified_gmt":"2023-07-12T23:54:51","slug":"estatisticas-resumidas-em-r-dplyr","status":"publish","type":"post","link":"https:\/\/statorials.org\/pt\/estatisticas-resumidas-em-r-dplyr\/","title":{"rendered":"Como calcular estat\u00edsticas resumidas em r usando dplyr"},"content":{"rendered":"<p><\/p>\n<hr>\n<p><span style=\"color: #000000;\">Voc\u00ea pode usar a seguinte sintaxe para calcular estat\u00edsticas resumidas para todas as vari\u00e1veis num\u00e9ricas em um quadro de dados em R usando fun\u00e7\u00f5es do pacote <strong>dplyr<\/strong> :<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #008000;\">library<\/span> (dplyr)\n<span style=\"color: #008000;\">library<\/span> (tidyr)\n\ndf %&gt;% summarise(across(where(is. <span style=\"color: #3366ff;\">numeric<\/span> ), .fns = \n                     list(min = min,\n                          median = median,\n                          mean = mean,\n                          stdev = sd,\n                          q25 = ~quantile(., <span style=\"color: #008000;\">0.25<\/span> ),\n                          q75 = ~quantile(., <span style=\"color: #008000;\">0.75<\/span> ),\n                          max = max))) %&gt;%\n  pivot_longer(everything(), names_sep=' <span style=\"color: #ff0000;\">_<\/span> ', names_to=c(' <span style=\"color: #ff0000;\">variable<\/span> ', ' <span style=\"color: #ff0000;\">.value<\/span> '))\n<\/strong><\/pre>\n<p> <span style=\"color: #000000;\">A fun\u00e7\u00e3o <strong>summarise()<\/strong> vem do pacote <strong>dplyr<\/strong> e \u00e9 usada para calcular estat\u00edsticas resumidas para vari\u00e1veis.<\/span><\/p>\n<p> <span style=\"color: #000000;\">A fun\u00e7\u00e3o <strong>pivot_longer()<\/strong> vem do pacote <strong>Tidyr<\/strong> e \u00e9 usada para formatar a sa\u00edda para facilitar a leitura.<\/span><\/p>\n<p> <span style=\"color: #000000;\">Esta sintaxe espec\u00edfica calcula as seguintes estat\u00edsticas resumidas para cada vari\u00e1vel num\u00e9rica em um quadro de dados:<\/span><\/p>\n<ul>\n<li> <span style=\"color: #000000;\">Valor m\u00ednimo<\/span><\/li>\n<li> <span style=\"color: #000000;\">Valor mediano<\/span><\/li>\n<li> <span style=\"color: #000000;\">Valor m\u00e9dio<\/span><\/li>\n<li> <span style=\"color: #000000;\">Desvio padr\u00e3o<\/span><\/li>\n<li> <span style=\"color: #000000;\">25\u00ba percentil<\/span><\/li>\n<li> <span style=\"color: #000000;\">75\u00ba percentil<\/span><\/li>\n<li> <span style=\"color: #000000;\">Valor m\u00e1ximo<\/span><\/li>\n<\/ul>\n<p> <span style=\"color: #000000;\">O exemplo a seguir mostra como usar esta fun\u00e7\u00e3o na pr\u00e1tica.<\/span><\/p>\n<h2> <span style=\"color: #000000;\"><strong>Exemplo: calcular estat\u00edsticas resumidas em R usando dplyr<\/strong><\/span><\/h2>\n<p> <span style=\"color: #000000;\">Suponha que temos o seguinte quadro de dados em R que cont\u00e9m informa\u00e7\u00f5es sobre v\u00e1rios jogadores de basquete:<\/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', 'A', 'B', 'B', 'B', 'B'),\n                 points=c(12, 15, 19, 14, 24, 25, 39, 34),\n                 assists=c(6, 8, 8, 9, 12, 6, 8, 10),\n                 rebounds=c(9, 9, 8, 10, 8, 4, 3, 3))\n\n<span style=\"color: #008080;\">#view data frame\n<\/span>df\n\n  team points assists rebounds\n1 to 12 6 9\n2 A 15 8 9\n3 A 19 8 8\n4 A 14 9 10\n5 B 24 12 8\n6 B 25 6 4\n7 B 39 8 3\n8 B 34 10 3<\/strong>\n<\/pre>\n<p> <span style=\"color: #000000;\">Podemos usar a seguinte sintaxe para calcular estat\u00edsticas resumidas para cada vari\u00e1vel num\u00e9rica no quadro de dados:<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #008000;\">library<\/span> (dplyr)\n<span style=\"color: #008000;\">library<\/span> (tidyr)\n\n<span style=\"color: #008080;\">#calculate summary statistics for each numeric variable in data frame\n<\/span>df %&gt;% summarise(across(where(is. <span style=\"color: #3366ff;\">numeric<\/span> ), .fns = \n                     list(min = min,\n                          median = median,\n                          mean = mean,\n                          stdev = sd,\n                          q25 = ~quantile(., <span style=\"color: #008000;\">0.25<\/span> ),\n                          q75 = ~quantile(., <span style=\"color: #008000;\">0.75<\/span> ),\n                          max = max))) %&gt;%\n  pivot_longer(everything(), names_sep=' <span style=\"color: #ff0000;\">_<\/span> ', names_to=c(' <span style=\"color: #ff0000;\">variable<\/span> ', ' <span style=\"color: #ff0000;\">.value<\/span> '))\n\n# A tibble: 3 x 8\n  variable min median mean stdev q25 q75 max\n             \n1 points 12 21.5 22.8 9.74 14.8 27.2 39\n2 assists 6 8 8.38 2.00 7.5 9.25 12\n3 rebounds 3 8 6.75 2.92 3.75 9 10\n<\/strong><\/pre>\n<p> <span style=\"color: #000000;\"><strong>&nbsp;<\/strong> Pelo resultado podemos ver:<\/span><\/p>\n<ul>\n<li> <span style=\"color: #000000;\">O valor m\u00ednimo na coluna de pontos \u00e9 <strong>12<\/strong> .<\/span><\/li>\n<li> <span style=\"color: #000000;\">O valor mediano na coluna de pontos \u00e9 <strong>21,5<\/strong> .<\/span><\/li>\n<li> <span style=\"color: #000000;\">O valor m\u00e9dio na coluna de pontos \u00e9 <strong>22,8<\/strong> .<\/span><\/li>\n<\/ul>\n<p> <span style=\"color: #000000;\">E assim por diante.<\/span><\/p>\n<p> <span style=\"color: #000000;\"><strong>Nota<\/strong> : Neste 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-resumir-manter-colunas\/\" target=\"_blank\" rel=\"noopener\">Como resumir os dados, mas manter todas as colunas usando dplyr<\/a><br \/> <a href=\"https:\/\/statorials.org\/pt\/dplyr-resume-multiplas-colunas\/\" target=\"_blank\" rel=\"noopener\">Como resumir m\u00faltiplas colunas usando dplyr<\/a><br \/> <a href=\"https:\/\/statorials.org\/pt\/desvio-padrao-dplyr\/\" target=\"_blank\" rel=\"noopener\">Como calcular o desvio padr\u00e3o usando dplyr<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Voc\u00ea pode usar a seguinte sintaxe para calcular estat\u00edsticas resumidas para todas as vari\u00e1veis num\u00e9ricas em um quadro de dados em R usando fun\u00e7\u00f5es do pacote dplyr : library (dplyr) library (tidyr) df %&gt;% summarise(across(where(is. numeric ), .fns = list(min = min, median = median, mean = mean, stdev = sd, q25 = ~quantile(., 0.25 [&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-4190","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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