{"id":1085,"date":"2023-07-27T17:17:59","date_gmt":"2023-07-27T17:17:59","guid":{"rendered":"https:\/\/statorials.org\/pl\/obliczyc-srednia-z-wielu-kolumn-w-r\/"},"modified":"2023-07-27T17:17:59","modified_gmt":"2023-07-27T17:17:59","slug":"obliczyc-srednia-z-wielu-kolumn-w-r","status":"publish","type":"post","link":"https:\/\/statorials.org\/pl\/obliczyc-srednia-z-wielu-kolumn-w-r\/","title":{"rendered":"Jak obliczy\u0107 \u015bredni\u0105 z wielu kolumn w r"},"content":{"rendered":"<p><\/p>\n<hr>\n<p><span style=\"color: #000000;\">Cz\u0119sto mo\u017cesz chcie\u0107 obliczy\u0107 \u015bredni\u0105 z wielu kolumn w R. Na szcz\u0119\u015bcie mo\u017cesz to \u0142atwo zrobi\u0107 za pomoc\u0105 funkcji <strong>colMeans()<\/strong> .<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong>colMeans(df)<\/strong><\/pre>\n<p> <span style=\"color: #000000;\">Poni\u017csze przyk\u0142ady pokazuj\u0105, jak w praktyce wykorzysta\u0107 t\u0119 funkcj\u0119.<\/span><\/p>\n<h3> <span style=\"color: #000000;\"><strong>U\u017cywanie metody colMeans() do znajdowania \u015bredniej z wielu kolumn<\/strong><\/span><\/h3>\n<p> <span style=\"color: #000000;\">Poni\u017cszy kod pokazuje, jak u\u017cywa\u0107 funkcji <strong>colMeans()<\/strong> do znajdowania \u015bredniej z ka\u017cdej kolumny w ramce danych:<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #008080;\">#create data frame<\/span>\ndf &lt;- data.frame(var1=c(1, 3, 3, 4, 5),\n                 var2=c(7, 7, 8, 3, 2),\n                 var3=c(3, 3, 6, 6, 8),\n                 var4=c(1, 1, 2, 8, 9))\n\n<span style=\"color: #008080;\">#find mean of each column<\/span>\ncolMeans(df)\n\nvar1 var2 var3 var4 \n 3.2 5.4 5.2 4.2 \n<\/strong><\/pre>\n<p> <span style=\"color: #000000;\">Mo\u017cemy r\u00f3wnie\u017c okre\u015bli\u0107, dla <em>kt\u00f3rych<\/em> kolumn ma znale\u017a\u0107 si\u0119 \u015brednia:<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #008080;\">#find the mean of columns 2 and 3<\/span>\ncolMeans(df[, c(2, 3)])\n\nvar2 var3 \n 5.4 5.2 \n\n<span style=\"color: #008080;\">#find the mean of the first three columns<\/span>\ncolMeans(df[, 1:3])\n\nvar1 var2 var3 \n 3.2 5.4 5.2<\/strong><\/pre>\n<p> <span style=\"color: #000000;\">Je\u015bli istniej\u0105 kolumny, kt\u00f3re nie s\u0105 liczbowe, mo\u017cesz u\u017cy\u0107 <a href=\"https:\/\/statorials.org\/pl\/przewodnik-dotyczacy-stosowania-lapply-sapply-i-tapply-w-r\/\" target=\"_blank\" rel=\"noopener noreferrer\">funkcji sapply()<\/a> , aby okre\u015bli\u0107, \u017ce chcesz znale\u017a\u0107 tylko \u015bredni\u0105 z kolumn liczbowych:<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #008080;\">#create data frame<\/span>\ndf &lt;- data.frame(var1=c(1, 3, 3, 4, 5),\n                 var2=c(7, 7, 8, 3, 2),\n                 var3=c(3, 3, 6, 6, 8),\n                 var4=c(1, 1, 2, 8, 9),\n                 var5=c('a', 'a', 'b', 'b', 'c'))\n\n<span style=\"color: #008080;\">#find mean of <em>only<\/em> numeric columns<\/span>\ncolMeans(df[ <span style=\"color: #3366ff;\">sapply<\/span> (df, is.numeric)])\n\nvar1 var2 var3 var4 \n 3.2 5.4 5.2 4.2<\/strong><\/pre>\n<p> <span style=\"color: #000000;\">A je\u015bli w kt\u00f3rej\u015b kolumnie brakuje warto\u015bci, mo\u017cesz u\u017cy\u0107 argumentu <strong>na.rm=TRUE,<\/strong> aby zignorowa\u0107 brakuj\u0105ce warto\u015bci przy obliczaniu \u015brednich:<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #008080;\">#create data frame with some missing values<\/span>\ndf &lt;- data.frame(var1=c(1, 3, NA, NA, 5),\n                 var2=c(7, 7, 8, 3, 2),\n                 var3=c(3, 3, 6, 6, 8),\n                 var4=c(1, 1, 2, 8, NA))\n\n<span style=\"color: #008080;\">#find mean of each column and ignore missing values<\/span>\ncolMeans(df, na.rm= <span style=\"color: #008000;\">TRUE<\/span> )\n\nvar1 var2 var3 var4 \n 3.0 5.4 5.2 3.0<\/strong><\/pre>\n<h3> <span style=\"color: #000000;\"><strong>Dodatkowe zasoby<\/strong><\/span><\/h3>\n<p> <a href=\"https:\/\/statorials.org\/pl\/r-zapetl-kolumny-ramki-danych\/\" target=\"_blank\" rel=\"noopener noreferrer\">Jak iterowa\u0107 po nazwach kolumn w R<\/a><br \/> <a href=\"https:\/\/statorials.org\/pl\/dodaj-okreslone-kolumny-w-r\/\" target=\"_blank\" rel=\"noopener noreferrer\">Jak sumowa\u0107 okre\u015blone kolumny w R<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Cz\u0119sto mo\u017cesz chcie\u0107 obliczy\u0107 \u015bredni\u0105 z wielu kolumn w R. Na szcz\u0119\u015bcie mo\u017cesz to \u0142atwo zrobi\u0107 za pomoc\u0105 funkcji colMeans() . colMeans(df) Poni\u017csze przyk\u0142ady pokazuj\u0105, jak w praktyce wykorzysta\u0107 t\u0119 funkcj\u0119. U\u017cywanie metody colMeans() do znajdowania \u015bredniej z wielu kolumn Poni\u017cszy kod pokazuje, jak u\u017cywa\u0107 funkcji colMeans() do znajdowania \u015bredniej z ka\u017cdej kolumny w ramce [&hellip;]<\/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-1085","post","type-post","status-publish","format-standard","hentry","category-przewodnik"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v21.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Jak obliczy\u0107 \u015bredni\u0105 z wielu kolumn w R - Statology<\/title>\n<meta name=\"description\" content=\"W tym samouczku przedstawiono kilka r\u00f3\u017cnych metod, kt\u00f3rych mo\u017cna u\u017cy\u0107 do obliczenia \u015bredniej wielu kolumn w ramce danych w j\u0119zyku R.\" \/>\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\/obliczyc-srednia-z-wielu-kolumn-w-r\/\" \/>\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 z wielu kolumn w R - Statology\" \/>\n<meta property=\"og:description\" content=\"W tym samouczku przedstawiono kilka r\u00f3\u017cnych metod, kt\u00f3rych mo\u017cna u\u017cy\u0107 do obliczenia \u015bredniej wielu kolumn w ramce danych w j\u0119zyku R.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/statorials.org\/pl\/obliczyc-srednia-z-wielu-kolumn-w-r\/\" \/>\n<meta property=\"og:site_name\" content=\"Statorials\" \/>\n<meta property=\"article:published_time\" content=\"2023-07-27T17:17:59+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=\"1 minuta\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/statorials.org\/pl\/obliczyc-srednia-z-wielu-kolumn-w-r\/\",\"url\":\"https:\/\/statorials.org\/pl\/obliczyc-srednia-z-wielu-kolumn-w-r\/\",\"name\":\"Jak obliczy\u0107 \u015bredni\u0105 z wielu kolumn w R - Statology\",\"isPartOf\":{\"@id\":\"https:\/\/statorials.org\/pl\/#website\"},\"datePublished\":\"2023-07-27T17:17:59+00:00\",\"dateModified\":\"2023-07-27T17:17:59+00:00\",\"author\":{\"@id\":\"https:\/\/statorials.org\/pl\/#\/schema\/person\/6484727a4612df3e69f016c3129c6965\"},\"description\":\"W tym samouczku przedstawiono kilka r\u00f3\u017cnych metod, kt\u00f3rych mo\u017cna u\u017cy\u0107 do obliczenia \u015bredniej wielu kolumn w ramce danych w j\u0119zyku R.\",\"breadcrumb\":{\"@id\":\"https:\/\/statorials.org\/pl\/obliczyc-srednia-z-wielu-kolumn-w-r\/#breadcrumb\"},\"inLanguage\":\"pl-PL\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/statorials.org\/pl\/obliczyc-srednia-z-wielu-kolumn-w-r\/\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/statorials.org\/pl\/obliczyc-srednia-z-wielu-kolumn-w-r\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Dom\",\"item\":\"https:\/\/statorials.org\/pl\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Jak obliczy\u0107 \u015bredni\u0105 z wielu kolumn w r\"}]},{\"@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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