{"id":1861,"date":"2023-07-24T16:53:11","date_gmt":"2023-07-24T16:53:11","guid":{"rendered":"https:\/\/statorials.org\/pl\/jest-na\/"},"modified":"2023-07-24T16:53:11","modified_gmt":"2023-07-24T16:53:11","slug":"jest-na","status":"publish","type":"post","link":"https:\/\/statorials.org\/pl\/jest-na\/","title":{"rendered":"Jak u\u017cywa\u0107 is.na w r (z przyk\u0142adami)"},"content":{"rendered":"<p><\/p>\n<hr>\n<p><span style=\"color: #000000;\">Mo\u017cesz u\u017cy\u0107 funkcji <strong>is.na()<\/strong> w R, aby sprawdzi\u0107 brakuj\u0105ce warto\u015bci w wektorach i ramkach danych.<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #008080;\">#check if each individual value is NA\n<\/span>is. <span style=\"color: #3366ff;\">na<\/span> (x)\n\n<span style=\"color: #008080;\">#count total NA values\n<\/span>sum( <span style=\"color: #3366ff;\">is.na<\/span> (x))\n\n<span style=\"color: #008080;\">#identify positions of NA values\n<\/span>which(is. <span style=\"color: #3366ff;\">na<\/span> (x))\n<\/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>Przyk\u0142ad 1: U\u017cyj is.na() z wektorami<\/strong><\/span><\/h3>\n<p> <span style=\"color: #000000;\">Poni\u017cszy kod pokazuje, jak u\u017cy\u0107 funkcji <strong>is.na()<\/strong> do sprawdzenia brakuj\u0105cych warto\u015bci w wektorze:<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #008080;\">#define vector with some missing values\n<span style=\"color: #000000;\">x &lt;- c(3, 5, 5, NA, 7, NA, 12, 16)<\/span>\n\n#check if each individual value is NA\n<\/span>is. <span style=\"color: #3366ff;\">na<\/span> (x)\n\n[1] FALSE FALSE FALSE TRUE FALSE TRUE FALSE FALSE\n\n<span style=\"color: #008080;\">#count total NA values\n<\/span>sum( <span style=\"color: #3366ff;\">is.na<\/span> (x))\n\n[1] 2\n\n<span style=\"color: #008080;\">#identify positions of NA values\n<\/span>which(is. <span style=\"color: #3366ff;\">na<\/span> (x))\n\n[1] 4 6\n<\/strong><\/pre>\n<p> <span style=\"color: #000000;\">Z wyniku mo\u017cemy zobaczy\u0107:<\/span><\/p>\n<ul>\n<li> <span style=\"color: #000000;\">W wektorze brakuje 2 warto\u015bci.<\/span><\/li>\n<li> <span style=\"color: #000000;\">Brakuj\u0105ce warto\u015bci znajduj\u0105 si\u0119 na pozycjach 4 i 6.<\/span><\/li>\n<\/ul>\n<h3> <span style=\"color: #000000;\"><strong>Przyk\u0142ad 2:<\/strong><\/span> <span style=\"color: #000000;\"><strong>U\u017cyj is.na() z ramkami danych<\/strong><\/span><\/h3>\n<p> <span style=\"color: #000000;\">Poni\u017cszy kod pokazuje, jak u\u017cy\u0107 funkcji is.na() do sprawdzenia brakuj\u0105cych warto\u015bci w ramce danych:<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #008080;\"><span style=\"color: #000000;\"><span style=\"color: #008080;\">#create data frame\n<\/span>df &lt;- data. <span style=\"color: #3366ff;\">frame<\/span> (var1=c(1, 3, 3, 4, 5),\n                 var2=c(7, NA, NA, 3, 2),\n                 var3=c(3, 3, 6, NA, 8),\n                 var4=c(NA, 1, 2, 8, 9))\n\n<span style=\"color: #008080;\">#view data frame\n<\/span>df\n\n  var1 var2 var3 var4\n1 1 7 3 NA\n2 3 NA 3 1\n3 3 NA 6 2\n4 4 3 NA 8\n5 5 2 8 9\n\n<span style=\"color: #008080;\">#find total NA values in data frame\n<\/span>sum( <span style=\"color: #3366ff;\">is.na<\/span> (df))\n\n[1] 4\n\n<span style=\"color: #008080;\">#find total NA values by column\n<\/span>sapply(df, <span style=\"color: #008000;\">function<\/span> (x) sum(is. <span style=\"color: #3366ff;\">na<\/span> (x)))\n\nvar1 var2 var3 var4 \n   0 2 1 1<\/span><\/span><\/strong><\/pre>\n<p> <span style=\"color: #000000;\">Z danych wyj\u015bciowych widzimy, \u017ce w ramce danych znajduj\u0105 si\u0119 <strong>4<\/strong> warto\u015bci NA.<\/span><\/p>\n<p> <span style=\"color: #000000;\">Mo\u017cemy r\u00f3wnie\u017c zobaczy\u0107:<\/span><\/p>\n<ul>\n<li> <span style=\"color: #000000;\">W kolumnie \u201evar1\u201d znajduje si\u0119 <strong>0<\/strong> warto\u015bci NA.<\/span><\/li>\n<li> <span style=\"color: #000000;\">W kolumnie \u201evar2\u201d znajduj\u0105 si\u0119 <strong>2<\/strong> warto\u015bci NA.<\/span><\/li>\n<li> <span style=\"color: #000000;\">W kolumnie \u201evar3\u201d znajduje si\u0119 <strong>1<\/strong> warto\u015b\u0107 NA.<\/span><\/li>\n<li> <span style=\"color: #000000;\">W kolumnie \u201evar4\u201d znajduje si\u0119 <strong>1<\/strong> warto\u015b\u0107 NA.<\/span><\/li>\n<\/ul>\n<h3> <span style=\"color: #000000;\"><strong>Dodatkowe zasoby<\/strong><\/span><\/h3>\n<p> <span style=\"color: #000000;\">Poni\u017csze tutoriale wyja\u015bniaj\u0105 inne przydatne funkcje, kt\u00f3re mo\u017cna wykorzysta\u0107 do obs\u0142ugi brakuj\u0105cych warto\u015bci w R.<\/span><\/p>\n<p> <a href=\"https:\/\/statorials.org\/pl\/na-pominac-w-r\/\" target=\"_blank\" rel=\"noopener\">Jak u\u017cywa\u0107 na.omit w R<\/a><br \/> <a href=\"https:\/\/statorials.org\/pl\/na-rm\/\" target=\"_blank\" rel=\"noopener\">Jak u\u017cywa\u0107 na.rm w R<\/a><br \/> <a href=\"https:\/\/statorials.org\/pl\/wynosi-zero-w-r\/\">Jak u\u017cywa\u0107 is.null w R<\/a><br \/><a href=\"https:\/\/statorials.org\/pl\/przypisz-brakujace-wartosci-w-r\/\" target=\"_blank\" rel=\"noopener\">Jak wszystkim przypisa\u0107 brakuj\u0105ce warto\u015bci w R<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Mo\u017cesz u\u017cy\u0107 funkcji is.na() w R, aby sprawdzi\u0107 brakuj\u0105ce warto\u015bci w wektorach i ramkach danych. #check if each individual value is NA is. na (x) #count total NA values sum( is.na (x)) #identify positions of NA values which(is. na (x)) Poni\u017csze przyk\u0142ady pokazuj\u0105, jak w praktyce wykorzysta\u0107 t\u0119 funkcj\u0119. Przyk\u0142ad 1: U\u017cyj is.na() z wektorami [&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-1861","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 u\u017cywa\u0107 is.na w R (z przyk\u0142adami) \u2013 Statorials<\/title>\n<meta name=\"description\" content=\"W tym samouczku wyja\u015bniono, jak u\u017cywa\u0107 funkcji is.na() 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\/jest-na\/\" \/>\n<meta property=\"og:locale\" content=\"pl_PL\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Jak u\u017cywa\u0107 is.na w R (z przyk\u0142adami) \u2013 Statorials\" \/>\n<meta property=\"og:description\" content=\"W tym samouczku wyja\u015bniono, jak u\u017cywa\u0107 funkcji is.na() w j\u0119zyku R, podaj\u0105c kilka przyk\u0142ad\u00f3w.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/statorials.org\/pl\/jest-na\/\" \/>\n<meta property=\"og:site_name\" content=\"Statorials\" \/>\n<meta property=\"article:published_time\" content=\"2023-07-24T16:53:11+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\/jest-na\/\",\"url\":\"https:\/\/statorials.org\/pl\/jest-na\/\",\"name\":\"Jak u\u017cywa\u0107 is.na w R (z przyk\u0142adami) \u2013 Statorials\",\"isPartOf\":{\"@id\":\"https:\/\/statorials.org\/pl\/#website\"},\"datePublished\":\"2023-07-24T16:53:11+00:00\",\"dateModified\":\"2023-07-24T16:53:11+00:00\",\"author\":{\"@id\":\"https:\/\/statorials.org\/pl\/#\/schema\/person\/6484727a4612df3e69f016c3129c6965\"},\"description\":\"W tym samouczku wyja\u015bniono, jak u\u017cywa\u0107 funkcji is.na() w j\u0119zyku R, podaj\u0105c kilka przyk\u0142ad\u00f3w.\",\"breadcrumb\":{\"@id\":\"https:\/\/statorials.org\/pl\/jest-na\/#breadcrumb\"},\"inLanguage\":\"pl-PL\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/statorials.org\/pl\/jest-na\/\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/statorials.org\/pl\/jest-na\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Dom\",\"item\":\"https:\/\/statorials.org\/pl\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Jak u\u017cywa\u0107 is.na 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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