{"id":2857,"date":"2023-07-20T09:27:24","date_gmt":"2023-07-20T09:27:24","guid":{"rendered":"https:\/\/statorials.org\/pt\/media-acumulada-em-r\/"},"modified":"2023-07-20T09:27:24","modified_gmt":"2023-07-20T09:27:24","slug":"media-acumulada-em-r","status":"publish","type":"post","link":"https:\/\/statorials.org\/pt\/media-acumulada-em-r\/","title":{"rendered":"Como calcular uma m\u00e9dia cumulativa em r"},"content":{"rendered":"<p><\/p>\n<hr>\n<p><span style=\"color: #000000;\">Uma <strong>m\u00e9dia cumulativa<\/strong> nos diz a m\u00e9dia de uma s\u00e9rie de valores at\u00e9 um determinado ponto.<\/span><\/p>\n<p> <span style=\"color: #000000;\">Voc\u00ea pode usar os seguintes m\u00e9todos para calcular a m\u00e9dia cumulativa dos valores em R:<\/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>cum_avg &lt;- cumsum(x) \/ seq_along(x)<\/strong><\/pre>\n<p> <span style=\"color: #000000;\"><strong>M\u00e9todo 2: use dplyr<\/strong><\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #008000;\">library<\/span> (dplyr)\n\ncum_avg &lt;- cummean(x)<\/strong><\/pre>\n<p> <span style=\"color: #000000;\">Ambos os m\u00e9todos retornam exatamente o mesmo resultado, mas o m\u00e9todo <strong>dplyr<\/strong> tende a ter um desempenho mais r\u00e1pido em grandes quadros de dados.<\/span><\/p>\n<p> <span style=\"color: #000000;\">Os exemplos a seguir mostram como usar cada m\u00e9todo na pr\u00e1tica com o seguinte quadro de dados em R:<\/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> (day=seq(1:16),\n                 sales=c(3, 6, 0, 2, 4, 1, 0, 1, 4, 7, 3, 3, 8, 3, 5, 5))\n\n<span style=\"color: #008080;\">#view head of data frame\n<\/span>head(df)\n\n  day sales\n1 1 3\n2 2 6\n3 3 0\n4 4 2\n5 5 4\n6 6 1\n<\/strong><\/pre>\n<h3> <span style=\"color: #000000;\"><strong>Exemplo 1: Calcule a m\u00e9dia acumulada usando a base R<\/strong><\/span><\/h3>\n<p> <span style=\"color: #000000;\">Podemos usar o c\u00f3digo a seguir para adicionar uma nova coluna ao nosso quadro de dados que exibe a m\u00e9dia acumulada de vendas:<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <span style=\"color: #000000;\"><strong><span style=\"color: #008080;\">#add new column that contains cumulative avg. of sales\n<\/span>df$cum_avg_sales &lt;- cumsum(df$sales) \/ seq_along(df$sales) \n\n<span style=\"color: #008080;\">#view updated data frame\n<\/span>df\n\n   day sales cum_avg_sales\n1 1 3 3.000000\n2 2 6 4.500000\n3 3 0 3.000000\n4 4 2 2.750000\n5 5 4 3.000000\n6 6 1 2.666667\n7 7 0 2.285714\n8 8 1 2.125000\n9 9 4 2.333333\n10 10 7 2.800000\n11 11 3 2.818182\n12 12 3 2.833333\n13 13 8 3.230769\n14 14 3 3.214286\n15 15 5 3.333333\n16 16 5 3.437500\n<\/strong><\/span><\/pre>\n<p> <span style=\"color: #000000;\">Interpretar\u00edamos os valores m\u00e9dios cumulativos como:<\/span><\/p>\n<ul>\n<li> <span style=\"color: #000000;\">A m\u00e9dia acumulada do valor das primeiras vendas \u00e9 <strong>3<\/strong> .<\/span><\/li>\n<li> <span style=\"color: #000000;\">A m\u00e9dia acumulada dos dois primeiros valores de vendas \u00e9 de <strong>4,5<\/strong> .<\/span><\/li>\n<li> <span style=\"color: #000000;\">A m\u00e9dia acumulada dos tr\u00eas primeiros valores de vendas \u00e9 <strong>3<\/strong> .<\/span><\/li>\n<li> <span style=\"color: #000000;\">A m\u00e9dia acumulada dos quatro primeiros valores de vendas \u00e9 de <strong>2,75<\/strong> .<\/span><\/li>\n<\/ul>\n<p> <span style=\"color: #000000;\">E assim por diante.<\/span><\/p>\n<h3> <span style=\"color: #000000;\"><strong>Exemplo 2: Calcular a m\u00e9dia cumulativa usando dplyr<\/strong><\/span><\/h3>\n<p> <span style=\"color: #000000;\">Tamb\u00e9m podemos usar a fun\u00e7\u00e3o <strong>cummean<\/strong> do pacote <a href=\"https:\/\/dplyr.tidyverse.org\/\" target=\"_blank\" rel=\"noopener\">dplyr<\/a> em R para calcular uma m\u00e9dia cumulativa.<\/span><\/p>\n<p> <span style=\"color: #000000;\">O c\u00f3digo a seguir mostra como usar esta fun\u00e7\u00e3o para adicionar uma nova coluna ao nosso quadro de dados que exibe a m\u00e9dia acumulada de vendas:<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <span style=\"color: #000000;\"><strong><span style=\"color: #008080;\"><span style=\"color: #000000;\"><span style=\"color: #008000;\">library<\/span> (dplyr)<\/span>\n\n#add new column that contains cumulative avg. of sales\n<\/span>df$cum_avg_sales &lt;- cummean(df$sales) \n\n<span style=\"color: #008080;\">#view updated data frame\n<\/span>df\n\n   day sales cum_avg_sales\n1 1 3 3.000000\n2 2 6 4.500000\n3 3 0 3.000000\n4 4 2 2.750000\n5 5 4 3.000000\n6 6 1 2.666667\n7 7 0 2.285714\n8 8 1 2.125000\n9 9 4 2.333333\n10 10 7 2.800000\n11 11 3 2.818182\n12 12 3 2.833333\n13 13 8 3.230769\n14 14 3 3.214286\n15 15 5 3.333333\n16 16 5 3.437500\n<\/strong><\/span><\/pre>\n<p> <span style=\"color: #000000;\"><span style=\"color: #000000;\">Observe que este m\u00e9todo retorna exatamente os mesmos resultados do m\u00e9todo anterior.<\/span><\/span><\/p>\n<h3> <span style=\"color: #000000;\"><strong>Recursos adicionais<\/strong><\/span><\/h3>\n<p> <span style=\"color: #000000;\">Os tutoriais a seguir explicam como calcular outras m\u00e9tricas comuns em R:<\/span><\/p>\n<p> <a href=\"https:\/\/statorials.org\/pt\/media-de-r-truncado\/\" target=\"_blank\" rel=\"noopener\">Como calcular uma m\u00e9dia aparada em R<\/a><br \/> <a href=\"https:\/\/statorials.org\/pt\/media-geometrica-em-r\/\" target=\"_blank\" rel=\"noopener\">Como calcular a m\u00e9dia geom\u00e9trica em R<\/a><br \/> <a href=\"https:\/\/statorials.org\/pt\/media-ponderada-em-r\/\" target=\"_blank\" rel=\"noopener\">Como calcular uma m\u00e9dia ponderada em R<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Uma m\u00e9dia cumulativa nos diz a m\u00e9dia de uma s\u00e9rie de valores at\u00e9 um determinado ponto. Voc\u00ea pode usar os seguintes m\u00e9todos para calcular a m\u00e9dia cumulativa dos valores em R: M\u00e9todo 1: Use Base R cum_avg &lt;- cumsum(x) \/ seq_along(x) M\u00e9todo 2: use dplyr library (dplyr) cum_avg &lt;- cummean(x) Ambos os m\u00e9todos retornam exatamente [&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-2857","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 uma m\u00e9dia cumulativa em R - Estatologia<\/title>\n<meta name=\"description\" content=\"Este tutorial explica como calcular uma m\u00e9dia cumulativa 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\/media-acumulada-em-r\/\" \/>\n<meta property=\"og:locale\" content=\"pt_PT\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Como calcular uma m\u00e9dia cumulativa em R - Estatologia\" \/>\n<meta property=\"og:description\" content=\"Este tutorial explica como calcular uma m\u00e9dia cumulativa em R, com v\u00e1rios exemplos.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/statorials.org\/pt\/media-acumulada-em-r\/\" \/>\n<meta property=\"og:site_name\" content=\"Statorials\" \/>\n<meta property=\"article:published_time\" content=\"2023-07-20T09:27:24+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\/media-acumulada-em-r\/\",\"url\":\"https:\/\/statorials.org\/pt\/media-acumulada-em-r\/\",\"name\":\"Como calcular uma m\u00e9dia cumulativa em R - Estatologia\",\"isPartOf\":{\"@id\":\"https:\/\/statorials.org\/pt\/#website\"},\"datePublished\":\"2023-07-20T09:27:24+00:00\",\"dateModified\":\"2023-07-20T09:27:24+00:00\",\"author\":{\"@id\":\"https:\/\/statorials.org\/pt\/#\/schema\/person\/e08f98e8db95e0aa9c310e1b27c9c666\"},\"description\":\"Este tutorial explica como calcular uma m\u00e9dia cumulativa em R, com v\u00e1rios exemplos.\",\"breadcrumb\":{\"@id\":\"https:\/\/statorials.org\/pt\/media-acumulada-em-r\/#breadcrumb\"},\"inLanguage\":\"pt-PT\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/statorials.org\/pt\/media-acumulada-em-r\/\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/statorials.org\/pt\/media-acumulada-em-r\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Lar\",\"item\":\"https:\/\/statorials.org\/pt\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Como calcular uma m\u00e9dia cumulativa em r\"}]},{\"@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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