{"id":3868,"date":"2023-07-15T02:15:01","date_gmt":"2023-07-15T02:15:01","guid":{"rendered":"https:\/\/statorials.org\/nl\/r-zoek-kolommen-met-alle-na\/"},"modified":"2023-07-15T02:15:01","modified_gmt":"2023-07-15T02:15:01","slug":"r-zoek-kolommen-met-alle-na","status":"publish","type":"post","link":"https:\/\/statorials.org\/nl\/r-zoek-kolommen-met-alle-na\/","title":{"rendered":"A: kolommen vinden met alle ontbrekende waarden"},"content":{"rendered":"<p><\/p>\n<hr>\n<p><span style=\"color: #000000;\">U kunt de volgende methoden gebruiken om kolommen in een gegevensframe in R te vinden die alle ontbrekende waarden bevatten:<\/span><\/p>\n<p> <span style=\"color: #000000;\"><strong>Methode 1: Gebruik Base R<\/strong><\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #008080;\">#check if each column has all missing values\n<\/span>all_miss &lt;- apply(df, 2, <span style=\"color: #008000;\">function<\/span> (x) all(is. <span style=\"color: #3366ff;\">na<\/span> (x)))\n\n<span style=\"color: #008080;\">#display columns with all missing values<\/span>\nnames(all_miss[all_miss&gt;0])   \n<\/strong><\/pre>\n<p> <span style=\"color: #000000;\"><strong>Methode 2: Gebruik het purrr-pakket<\/strong><\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <b><span style=\"color: #008000;\">library<\/span> (purrr)\n\n<strong><span style=\"color: #008080;\">#display columns with all missing values<\/span><\/strong>\ndf %&gt;% keep(~all(is. <span style=\"color: #3366ff;\">na<\/span> (.x))) %&gt;% names\n<\/b><\/pre>\n<p> <span style=\"color: #000000;\">Beide methoden leveren hetzelfde resultaat op, maar de purrr-benadering is meestal sneller voor extreem grote dataframes.<\/span><\/p>\n<p> <span style=\"color: #000000;\">De volgende voorbeelden laten zien hoe u elke methode kunt gebruiken met het volgende dataframe in R:<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <b><strong><span style=\"color: #008080;\">#create data frame\n<span style=\"color: #000000;\">df &lt;- data. <span style=\"color: #3366ff;\">frame<\/span> (points=c(21, 15, 10, 4, 4, 9, 12, 10),\n                 assists=c(NA, NA, NA, NA, NA, NA, NA, NA),\n                 rebounds=c(8, 12, 14, 10, 7, 9, 8, 5),\n                 steals=c(NA, NA, NA, NA, NA, NA, NA, NA))\n\n<span style=\"color: #008080;\">#view data frame\n<\/span>df\n\n  points assists rebounds steals\n1 21 NA 8 NA\n2 15 NA 12 NA\n3 10 NA 14 NA\n4 4 NA 10 NA\n5 4 NA 7 NA\n6 9 NA 9 NA\n7 12 NA 8 NA\n8 10 NA 5 NA<\/span><\/span><\/strong><\/b><\/pre>\n<h2> <span style=\"color: #000000;\"><strong>Voorbeeld 1: Zoek kolommen met alle ontbrekende waarden met behulp van Base R<\/strong><\/span><\/h2>\n<p> <span style=\"color: #000000;\">De volgende code laat zien hoe u kolommen in het gegevensframe kunt vinden met alle ontbrekende waarden:<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #008080;\">#check if each column has all missing values\n<\/span>all_miss &lt;- apply(df, 2, <span style=\"color: #008000;\">function<\/span> (x) all(is. <span style=\"color: #3366ff;\">na<\/span> (x)))\n\n<span style=\"color: #008080;\">#display columns with all missing values<\/span>\nnames(all_miss[all_miss&gt;0])   \n\n[1] \u201cassists\u201d \u201csteals\u201d \n<\/strong><\/pre>\n<p> <span style=\"color: #000000;\">Uit het resultaat kunnen we zien dat de kolommen <strong>assists<\/strong> en <strong>intercepts<\/strong> allemaal ontbrekende waarden hebben.<\/span><\/p>\n<h2> <span style=\"color: #000000;\"><strong>Voorbeeld 2: Zoek kolommen met alle ontbrekende waarden met behulp van het purrr-pakket<\/strong><\/span><\/h2>\n<p> <span style=\"color: #000000;\">De volgende code laat zien hoe u kolommen in het dataframe kunt vinden met alle ontbrekende waarden met behulp van functies uit het <a href=\"https:\/\/purrr.tidyverse.org\/\" target=\"_blank\" rel=\"noopener\">purrr-<\/a> pakket:<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <b><span style=\"color: #008000;\">library<\/span> (purrr)\n\n<strong><span style=\"color: #008080;\">#display columns with all missing values<\/span><\/strong>\ndf %&gt;% keep(~all(is. <span style=\"color: #3366ff;\">na<\/span> (.x))) %&gt;% names\n\n[1] \u201cassists\u201d \u201csteals\u201d \n<\/b><\/pre>\n<p> <span style=\"color: #000000;\">Uit het resultaat kunnen we zien dat de kolommen <strong>assists<\/strong> en <strong>intercepts<\/strong> allemaal ontbrekende waarden hebben.<\/span><\/p>\n<p> <span style=\"color: #000000;\">Dit komt overeen met de uitvoer van de basis R-methode.<\/span><\/p>\n<h2> <span style=\"color: #000000;\"><strong>Aanvullende bronnen<\/strong><\/span><\/h2>\n<p> <span style=\"color: #000000;\">In de volgende tutorials wordt uitgelegd hoe u andere veelvoorkomende bewerkingen met ontbrekende waarden in R kunt uitvoeren:<\/span><\/p>\n<p> <a href=\"https:\/\/statorials.org\/nl\/impliceer-ontbrekende-waarden-in-r\/\" target=\"_blank\" rel=\"noopener\">Hoe je allemaal ontbrekende waarden in R kunt toeschrijven<\/a><br \/> <a href=\"https:\/\/statorials.org\/nl\/vervang-na-door-string-in-r\/\" target=\"_blank\" rel=\"noopener\">NA&#8217;s vervangen door strings in R<\/a><br \/> <a href=\"https:\/\/statorials.org\/nl\/dplyr-vervang-na-door-nul\/\" target=\"_blank\" rel=\"noopener\">Hoe NA te vervangen door Zero in dplyr<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>U kunt de volgende methoden gebruiken om kolommen in een gegevensframe in R te vinden die alle ontbrekende waarden bevatten: Methode 1: Gebruik Base R #check if each column has all missing values all_miss &lt;- apply(df, 2, function (x) all(is. na (x))) #display columns with all missing values names(all_miss[all_miss&gt;0]) Methode 2: Gebruik het purrr-pakket library [&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-3868","post","type-post","status-publish","format-standard","hentry","category-gids"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v21.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>A: Kolommen vinden met alle ontbrekende waarden - Statorials<\/title>\n<meta name=\"description\" content=\"In deze tutorial wordt uitgelegd hoe u kolommen met alle NA-waarden in R kunt vinden, inclusief voorbeelden.\" \/>\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\/nl\/r-zoek-kolommen-met-alle-na\/\" \/>\n<meta property=\"og:locale\" content=\"de_DE\" \/>\n<meta property=\"og:type\" content=\"article\" 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