{"id":1560,"date":"2023-07-25T21:20:18","date_gmt":"2023-07-25T21:20:18","guid":{"rendered":"https:\/\/statorials.org\/pl\/alfa-cronbacha-w-r\/"},"modified":"2023-07-25T21:20:18","modified_gmt":"2023-07-25T21:20:18","slug":"alfa-cronbacha-w-r","status":"publish","type":"post","link":"https:\/\/statorials.org\/pl\/alfa-cronbacha-w-r\/","title":{"rendered":"Jak obliczy\u0107 alfa cronbacha w r (z przyk\u0142adami)"},"content":{"rendered":"

<\/p>\n

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Alfa Chronbacha<\/strong> to spos\u00f3b pomiaru wewn\u0119trznej sp\u00f3jno\u015bci<\/a> kwestionariusza lub ankiety.<\/span><\/p>\n

Alfa Cronbacha waha si\u0119 od 0 do 1, przy czym wy\u017csze warto\u015bci wskazuj\u0105, \u017ce ankieta lub kwestionariusz jest bardziej rzetelny.<\/span><\/p>\n

Naj\u0142atwiejszym sposobem obliczenia alfa Cronbacha jest u\u017cycie funkcji cronbach.alpha()<\/strong> z pakietu ltm<\/strong> .<\/span><\/p>\n

W tym samouczku przedstawiono praktyczny przyk\u0142ad u\u017cycia tej funkcji.<\/span><\/p>\n

Przyk\u0142ad: Jak obliczy\u0107 alfa Cronbacha w R<\/strong><\/span><\/h3>\n

Za\u0142\u00f3\u017cmy, \u017ce menad\u017cerka restauracji chce zmierzy\u0107 og\u00f3ln\u0105 satysfakcj\u0119 klient\u00f3w, wi\u0119c wysy\u0142a ankiet\u0119 do 10 klient\u00f3w, kt\u00f3rzy mog\u0105 oceni\u0107 restauracj\u0119 w skali od 1 do 3 dla r\u00f3\u017cnych kategorii.<\/span><\/p>\n

Mo\u017cemy u\u017cy\u0107 nast\u0119puj\u0105cego kodu do obliczenia alfa Cronbacha dla odpowiedzi na ankiet\u0119:<\/span><\/p>\n

 library<\/span> (ltm)\n\n#enter survey responses as a data frame\n<\/span>data <- data. frame<\/span> (Q1=c(1, 2, 2, 3, 2, 2, 3, 3, 2, 3),\n                   Q2=c(1, 1, 1, 2, 3, 3, 2, 3, 3, 3),\n                   Q3=c(1, 1, 2, 1, 2, 3, 3, 3, 2, 3))\n\n#calculate Cronbach's Alpha\n<\/span>cronbach. alpha<\/span> (data)\n\nCronbach's alpha for the 'data' data-set\n\nItems: 3\nSample units: 10\nalpha: 0.773<\/strong><\/span><\/pre>\n
 Alfa Cronbacha wynosi 0,773<\/strong> .<\/span><\/p>\n
 Nale\u017cy pami\u0119ta\u0107, \u017ce mo\u017cemy r\u00f3wnie\u017c okre\u015bli\u0107 CI=True<\/strong> , aby zwr\u00f3ci\u0107 95% przedzia\u0142 ufno\u015bci dla alfa Cronbacha:<\/span><\/p>\n
 #calculate Cronbach's Alpha with 95% confidence interval\n<\/span>cronbach. alpha<\/span> (data, CI= TRUE<\/span> )\n\nCronbach's alpha for the 'data' data-set\n\nItems: 3\nSample units: 10\nalpha: 0.773\n\nBootstrap 95% CI based on 1000 samples\n 2.5% 97.5% \n0.053 0.930 \n<\/strong><\/span><\/pre>\n
 Widzimy, \u017ce 95% przedzia\u0142 ufno\u015bci dla alfa Cronbacha wynosi [0,053, 0,930]<\/strong> .<\/span><\/p>\n
 Uwaga:<\/strong> ten przedzia\u0142 ufno\u015bci jest niezwykle szeroki ze wzgl\u0119du na ma\u0142\u0105 wielko\u015b\u0107 pr\u00f3by. W praktyce zaleca si\u0119 stosowanie pr\u00f3by o liczebno\u015bci co najmniej 20 os\u00f3b. Dla uproszczenia zastosowali\u015bmy tu pr\u00f3bk\u0119 o liczebno\u015bci 10 os\u00f3b.<\/span><\/em><\/p>\n
 Poni\u017csza tabela opisuje, w jaki spos\u00f3b og\u00f3lnie interpretuje si\u0119 r\u00f3\u017cne warto\u015bci alfa Cronbacha:<\/span><\/p>\n\n\n\n\n\n\n\n\n\n
 Alfa Cronbacha<\/span><\/strong><\/th>\n Wewn\u0119trzna sp\u00f3jno\u015b\u0107<\/span><\/strong><\/th>\n<\/tr>\n
 0,9 \u2264 \u03b1<\/span><\/td>\n Doskona\u0142y<\/span><\/td>\n<\/tr>\n
 0,8 \u2264\u03b1 <0,9<\/span><\/td>\n DOBRY<\/span><\/td>\n<\/tr>\n
 0,7 \u2264\u03b1 < 0,8<\/span><\/td>\n Do przyj\u0119cia<\/span><\/td>\n<\/tr>\n
 0,6 \u2264\u03b1 < 0,7<\/span><\/td>\n W\u0105tpliwy<\/span><\/td>\n<\/tr>\n
 0,5 \u2264\u03b1 < 0,6<\/span><\/td>\n S\u0142aby<\/span><\/td>\n<\/tr>\n
 \u03b1 < 0,5<\/span><\/td>\n Gorsz\u0105cy<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
 Poniewa\u017c obliczyli\u015bmy, \u017ce alfa Cronbacha wynosi 0,773<\/strong> , powiedzieliby\u015bmy, \u017ce wewn\u0119trzna sp\u00f3jno\u015b\u0107 tego badania jest \u201edopuszczalna\u201d.<\/span><\/p>\n
 Bonus:<\/strong> Zach\u0119camy do skorzystania z kalkulatora Alfa Cronbacha, aby znale\u017a\u0107 Alfa Cronbacha dla danego zbioru danych.<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"
Alfa Chronbacha to spos\u00f3b pomiaru wewn\u0119trznej sp\u00f3jno\u015bci kwestionariusza lub ankiety. Alfa Cronbacha waha si\u0119 od 0 do 1, przy czym wy\u017csze warto\u015bci wskazuj\u0105, \u017ce ankieta lub kwestionariusz jest bardziej rzetelny. Naj\u0142atwiejszym sposobem obliczenia alfa Cronbacha jest u\u017cycie funkcji cronbach.alpha() z pakietu ltm . W tym samouczku przedstawiono praktyczny przyk\u0142ad u\u017cycia tej funkcji. Przyk\u0142ad: Jak obliczy\u0107 […]<\/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-1560","post","type-post","status-publish","format-standard","hentry","category-przewodnik"],"yoast_head":"\nJak obliczy\u0107 alfa Cronbacha w R (z przyk\u0142adami)<\/title>\n<meta name=\"description\" content=\"W tym samouczku wyja\u015bniono, jak obliczy\u0107 alfa Cronbacha w j\u0119zyku R, na przyk\u0142adzie.\" \/>\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\/alfa-cronbacha-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 alfa Cronbacha w R (z przyk\u0142adami)\" \/>\n<meta property=\"og:description\" content=\"W tym samouczku wyja\u015bniono, jak obliczy\u0107 alfa Cronbacha w j\u0119zyku R, na przyk\u0142adzie.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/statorials.org\/pl\/alfa-cronbacha-w-r\/\" \/>\n<meta property=\"og:site_name\" content=\"Statorials\" \/>\n<meta property=\"article:published_time\" content=\"2023-07-25T21:20:18+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\/alfa-cronbacha-w-r\/\",\"url\":\"https:\/\/statorials.org\/pl\/alfa-cronbacha-w-r\/\",\"name\":\"Jak obliczy\u0107 alfa Cronbacha w R (z przyk\u0142adami)\",\"isPartOf\":{\"@id\":\"https:\/\/statorials.org\/pl\/#website\"},\"datePublished\":\"2023-07-25T21:20:18+00:00\",\"dateModified\":\"2023-07-25T21:20:18+00:00\",\"author\":{\"@id\":\"https:\/\/statorials.org\/pl\/#\/schema\/person\/6484727a4612df3e69f016c3129c6965\"},\"description\":\"W tym samouczku wyja\u015bniono, jak obliczy\u0107 alfa Cronbacha w j\u0119zyku R, na przyk\u0142adzie.\",\"breadcrumb\":{\"@id\":\"https:\/\/statorials.org\/pl\/alfa-cronbacha-w-r\/#breadcrumb\"},\"inLanguage\":\"pl-PL\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/statorials.org\/pl\/alfa-cronbacha-w-r\/\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/statorials.org\/pl\/alfa-cronbacha-w-r\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Dom\",\"item\":\"https:\/\/statorials.org\/pl\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Jak obliczy\u0107 alfa cronbacha 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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