{"id":1087,"date":"2023-07-27T17:11:03","date_gmt":"2023-07-27T17:11:03","guid":{"rendered":"https:\/\/statorials.org\/pl\/r-srednia-na-grupe\/"},"modified":"2023-07-27T17:11:03","modified_gmt":"2023-07-27T17:11:03","slug":"r-srednia-na-grupe","status":"publish","type":"post","link":"https:\/\/statorials.org\/pl\/r-srednia-na-grupe\/","title":{"rendered":"Jak obliczy\u0107 \u015bredni\u0105 grupow\u0105 w r (z przyk\u0142adami)"},"content":{"rendered":"

<\/p>\n

\n

Cz\u0119sto mo\u017cesz chcie\u0107 obliczy\u0107 \u015bredni\u0105 grupy w R. Mo\u017cesz w tym celu skorzysta\u0107 z trzech metod:<\/span><\/p>\n

Metoda 1: U\u017cyj zasady R.<\/strong><\/span><\/p>\n

 aggregate(df$col_to_aggregate, list(df$col_to_group_by), FUN= mean<\/span> )<\/span><\/strong><\/pre>\n
 Metoda 2: U\u017cyj pakietu dplyr().<\/strong><\/span><\/p>\n
 library<\/span> (dplyr)\n\ndf %>%\n  group_by<\/span> (col_to_group_by) %>%\n  summarise_at<\/span> (vars(col_to_aggregate), list(name = mean<\/span> ))\n<\/b><\/span><\/pre>\n
 Metoda 3: U\u017cyj pakietu data.table.<\/strong><\/span><\/p>\n
 library<\/span> (data.table)\n\ndt[ ,list(mean= mean<\/span> (col_to_aggregate)), by=col_to_group_by]\n<\/b><\/span><\/pre>\n
 Poni\u017csze przyk\u0142ady pokazuj\u0105, jak zastosowa\u0107 ka\u017cd\u0105 z tych metod w praktyce.<\/span><\/p>\n
 Metoda 1: Oblicz \u015bredni\u0105 na grup\u0119, korzystaj\u0105c z podstawy R<\/strong><\/span><\/h3>\n
 Poni\u017cszy kod ilustruje spos\u00f3b u\u017cycia funkcji Aggregate()<\/strong> bazy danych j\u0119zyka R do obliczenia \u015bredniej liczby punkt\u00f3w zdobytych przez dru\u017cyn\u0119 w nast\u0119puj\u0105cej ramce danych:<\/span><\/p>\n
 #create data frame<\/span>\ndf <- 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>#view data frame<\/span>\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>#find mean points scored by team\n<\/span><\/span>aggregate(df$pts, list(df$team), FUN= mean<\/span> )\n\n  Group.1 x\n1 to 6.50000\n2 b 12.33333\n3 to 7.00000\n<\/span><\/strong><\/pre>\n
 Metoda 2: Oblicz \u015bredni\u0105 na grup\u0119 za pomoc\u0105 dplyr<\/strong><\/span><\/h3>\n
 Poni\u017cszy kod pokazuje, jak u\u017cywa\u0107 funkcji group_by<\/strong> ()<\/strong> i summarise_at()<\/strong> z pakietu dplyr<\/strong> do obliczania \u015bredniej liczby punkt\u00f3w zdobytych przez dru\u017cyn\u0119 w nast\u0119puj\u0105cej ramce danych:<\/span><\/p>\n
 library<\/span> (dplyr)<\/span><\/b>\n\n#create data frame<\/span>\ndf <- 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#find mean points scored by team<\/span>\ndf %>%\ngroup_by<\/span> (team) %>%\nsummarise_at<\/span> (vars(pts), list(name = mean<\/span> ))\n\n# A tibble: 3 x 2\n  team name\n  <fct> <dbl>\n1 to 6.5\n2 b 12.3\n3 v 7<\/b>\n<\/span><\/strong><\/pre>\n
 Metoda 3: Oblicz \u015bredni\u0105 dla grupy, korzystaj\u0105c z tabeli danych<\/strong><\/span><\/h3>\n
 Poni\u017cszy kod pokazuje, jak obliczy\u0107 \u015bredni\u0105 punkt\u00f3w zdobytych przez dru\u017cyn\u0119 w nast\u0119puj\u0105cej ramce danych:<\/span><\/p>\n
 library<\/span> (data.table)<\/span><\/b>\n\n#create data frame<\/span>\ndf <- 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#convert data frame to data table<\/span> \nsetDT(df)\n\n#find mean points scored by team<\/span>\ndf[,list(mean= 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
 Nale\u017cy pami\u0119ta\u0107, \u017ce wszystkie trzy metody zwracaj\u0105 identyczne wyniki.<\/span><\/p>\n
 Powi\u0105zane:<\/strong> Kompletny przewodnik po funkcji \u015bredniej w j\u0119zyku R<\/a><\/span><\/p>\n
 Dodatkowe zasoby<\/strong><\/span><\/h3>\n
 Jak obliczy\u0107 sum\u0119 wed\u0142ug grupy w R<\/a>
 Jak obliczy\u0107 kwantyle wed\u0142ug grupy w R<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"
Cz\u0119sto mo\u017cesz chcie\u0107 obliczy\u0107 \u015bredni\u0105 grupy w R. Mo\u017cesz w tym celu skorzysta\u0107 z trzech metod: Metoda 1: U\u017cyj zasady R. aggregate(df$col_to_aggregate, list(df$col_to_group_by), FUN= mean ) Metoda 2: U\u017cyj pakietu dplyr(). library (dplyr) df %>% group_by (col_to_group_by) %>% summarise_at (vars(col_to_aggregate), list(name = mean )) Metoda 3: U\u017cyj pakietu data.table. library (data.table) dt[ ,list(mean= mean (col_to_aggregate)), […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3],"tags":[],"class_list":["post-1087","post","type-post","status-publish","format-standard","hentry","category-przewodnik"],"yoast_head":"\nJak obliczy\u0107 \u015bredni\u0105 grupow\u0105 w R (z przyk\u0142adami) - Statologia<\/title>\n<meta name=\"description\" content=\"W tym samouczku wyja\u015bniono, jak obliczy\u0107 \u015bredni\u0105 grupow\u0105 w j\u0119zyku R, podaj\u0105c kilka przyk\u0142ad\u00f3w.\" \/>\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\/pl\/r-srednia-na-grupe\/\" \/>\n<meta property=\"og:locale\" content=\"pl_PL\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Jak obliczy\u0107 \u015bredni\u0105 grupow\u0105 w R (z przyk\u0142adami) - Statologia\" \/>\n<meta property=\"og:description\" content=\"W tym samouczku wyja\u015bniono, jak obliczy\u0107 \u015bredni\u0105 grupow\u0105 w j\u0119zyku R, podaj\u0105c kilka przyk\u0142ad\u00f3w.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/statorials.org\/pl\/r-srednia-na-grupe\/\" \/>\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=\"Benjamin Anderson\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Napisane przez\" \/>\n\t<meta name=\"twitter:data1\" content=\"Benjamin Anderson\" \/>\n\t<meta name=\"twitter:label2\" content=\"Szacowany czas czytania\" \/>\n\t<meta name=\"twitter:data2\" content=\"2 minuty\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/statorials.org\/pl\/r-srednia-na-grupe\/\",\"url\":\"https:\/\/statorials.org\/pl\/r-srednia-na-grupe\/\",\"name\":\"Jak obliczy\u0107 \u015bredni\u0105 grupow\u0105 w R (z przyk\u0142adami) - Statologia\",\"isPartOf\":{\"@id\":\"https:\/\/statorials.org\/pl\/#website\"},\"datePublished\":\"2023-07-27T17:11:03+00:00\",\"dateModified\":\"2023-07-27T17:11:03+00:00\",\"author\":{\"@id\":\"https:\/\/statorials.org\/pl\/#\/schema\/person\/6484727a4612df3e69f016c3129c6965\"},\"description\":\"W tym samouczku wyja\u015bniono, jak obliczy\u0107 \u015bredni\u0105 grupow\u0105 w j\u0119zyku R, podaj\u0105c kilka przyk\u0142ad\u00f3w.\",\"breadcrumb\":{\"@id\":\"https:\/\/statorials.org\/pl\/r-srednia-na-grupe\/#breadcrumb\"},\"inLanguage\":\"pl-PL\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/statorials.org\/pl\/r-srednia-na-grupe\/\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/statorials.org\/pl\/r-srednia-na-grupe\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Dom\",\"item\":\"https:\/\/statorials.org\/pl\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Jak obliczy\u0107 \u015bredni\u0105 grupow\u0105 w r (z przyk\u0142adami)\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\/\/statorials.org\/pl\/#website\",\"url\":\"https:\/\/statorials.org\/pl\/\",\"name\":\"Statorials\",\"description\":\"Tw\u00f3j przewodnik po kompetencjach statystycznych!\",\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\/\/statorials.org\/pl\/?s={search_term_string}\"},\"query-input\":\"required name=search_term_string\"}],\"inLanguage\":\"pl-PL\"},{\"@type\":\"Person\",\"@id\":\"https:\/\/statorials.org\/pl\/#\/schema\/person\/6484727a4612df3e69f016c3129c6965\",\"name\":\"Benjamin Anderson\",\"image\":{\"@type\":\"ImageObject\",\"inLanguage\":\"pl-PL\",\"@id\":\"https:\/\/statorials.org\/pl\/#\/schema\/person\/image\/\",\"url\":\"https:\/\/statorials.org\/pl\/wp-content\/uploads\/2023\/11\/Benjamin-Anderson-96x96.jpg\",\"contentUrl\":\"https:\/\/statorials.org\/pl\/wp-content\/uploads\/2023\/11\/Benjamin-Anderson-96x96.jpg\",\"caption\":\"Benjamin Anderson\"},\"description\":\"Cze\u015b\u0107, jestem Benjamin i jestem emerytowanym profesorem statystyki, kt\u00f3ry zosta\u0142 oddanym nauczycielem Statorials. 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