{"id":3903,"date":"2023-07-14T20:58:55","date_gmt":"2023-07-14T20:58:55","guid":{"rendered":"https:\/\/statorials.org\/tr\/ortak-test-r\/"},"modified":"2023-07-14T20:58:55","modified_gmt":"2023-07-14T20:58:55","slug":"ortak-test-r","status":"publish","type":"post","link":"https:\/\/statorials.org\/tr\/ortak-test-r\/","title":{"rendered":"R&#39;de coeftest() i\u015flevi nas\u0131l kullan\u0131l\u0131r?"},"content":{"rendered":"<p><\/p>\n<hr>\n<p><span style=\"color: #000000;\">Bir regresyon modelinde tahmin edilen her katsay\u0131 i\u00e7in bir t testi ger\u00e7ekle\u015ftirmek \u00fczere R&#8217;deki <strong>lmtest<\/strong> paketindeki <strong>coeftest()<\/strong> i\u015flevini kullanabilirsiniz.<\/span><\/p>\n<p> <span style=\"color: #000000;\">Bu i\u015flev a\u015fa\u011f\u0131daki temel s\u00f6zdizimini kullan\u0131r:<\/span><\/p>\n<p> <strong><span style=\"color: #000000;\">ortaktest(x)<\/span><\/strong><\/p>\n<p> <span style=\"color: #000000;\">Alt\u0131n:<\/span><\/p>\n<ul>\n<li> <span style=\"color: #000000;\"><strong>x<\/strong> : Uygun regresyon modelinin ad\u0131<\/span><\/li>\n<\/ul>\n<p> <span style=\"color: #000000;\">A\u015fa\u011f\u0131daki \u00f6rnekte bu fonksiyonun pratikte nas\u0131l kullan\u0131laca\u011f\u0131 g\u00f6sterilmektedir.<\/span><\/p>\n<h2> <span style=\"color: #000000;\"><strong>\u00d6rnek: R&#8217;de coeftest() i\u015flevi nas\u0131l kullan\u0131l\u0131r?<\/strong><\/span><\/h2>\n<p> <span style=\"color: #000000;\">R&#8217;de, bir s\u0131n\u0131ftaki 10 \u00f6\u011frencinin ders \u00e7al\u0131\u015fmak i\u00e7in harcanan saat say\u0131s\u0131n\u0131, al\u0131nan uygulama s\u0131navlar\u0131n\u0131n say\u0131s\u0131n\u0131 ve final s\u0131nav puan\u0131n\u0131 g\u00f6steren a\u015fa\u011f\u0131daki veri \u00e7er\u00e7evesine sahip oldu\u011fumuzu varsayal\u0131m:<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #008080;\">#create data frame\n<\/span>df &lt;- data. <span style=\"color: #3366ff;\">frame<\/span> (score=c(77, 79, 84, 85, 88, 99, 95, 90, 92, 94),\n                 hours=c(1, 1, 2, 3, 2, 4, 4, 2, 3, 3),\n                 prac_exams=c(2, 3, 3, 2, 4, 5, 4, 3, 5, 4))\n\n<span style=\"color: #008080;\">#view data frame\n<\/span>df\n\n   score hours prac_exams\n1 77 1 2\n2 79 1 3\n3 84 2 3\n4 85 3 2\n5 88 2 4\n6 99 4 5\n7 95 4 4\n8 90 2 3\n9 92 3 5\n10 94 3 4\n<\/strong><\/pre>\n<p> <span style=\"color: #000000;\">\u015eimdi a\u015fa\u011f\u0131daki \u00e7oklu do\u011frusal regresyon modelini R&#8217;ye s\u0131\u011fd\u0131rmak istedi\u011fimizi varsayal\u0131m:<\/span><\/p>\n<p> <span style=\"color: #000000;\">S\u0131nav puan\u0131 = \u03b2 <sub>0<\/sub> + \u03b2 <sub>1<\/sub> (saat) + \u03b2 <sub>2<\/sub> (pratik s\u0131navlar)<\/span><\/p>\n<p> <span style=\"color: #000000;\">Bu modeli uyarlamak i\u00e7in <a href=\"https:\/\/statorials.org\/tr\/rde-lm-islevi\/\" target=\"_blank\" rel=\"noopener\">lm()<\/a> fonksiyonunu kullanabiliriz:<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #008080;\">#fit multiple linear regression model\n<\/span>fit &lt;- lm(score ~ hours + prac_exams, data=df)\n<\/strong><\/pre>\n<p> <span style=\"color: #000000;\">Daha sonra modeldeki her uygun regresyon katsay\u0131s\u0131 i\u00e7in bir t-testi ger\u00e7ekle\u015ftirmek \u00fczere <strong>coeftest()<\/strong> i\u015flevini kullanabiliriz:<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #008080;\"><span style=\"color: #000000;\"><span style=\"color: #008000;\">library<\/span> (lmtest)<\/span>\n\n#perform t-test for each coefficient in model<\/span>\ncoeftest(fit)\n\nt test of coefficients:\n\n            Estimate Std. Error t value Pr(&gt;|t|)    \n(Intercept) 68.40294 2.87227 23.8150 5.851e-08 ***\nhours 4.19118 0.99612 4.2075 0.003998 ** \nprac_exams 2.69118 0.99612 2.7017 0.030566 *  \n---\nSignificant. codes: 0 '***' 0.001 '**' 0.01 '*' 0.05 '.' 0.1 ' ' 1\n<\/strong><\/pre>\n<p> <span style=\"color: #000000;\">Her t testi i\u00e7in t testi istatisti\u011fi ve kar\u015f\u0131l\u0131k gelen p de\u011feri g\u00f6r\u00fcnt\u00fclenir:<\/span><\/p>\n<ul>\n<li> <span style=\"color: #000000;\"><strong>Kesi\u015fme<\/strong> : t = 23,8150, p = &lt;0,000<\/span><\/li>\n<li> <span style=\"color: #000000;\"><strong>saat<\/strong> : t = 4,2075, p = 0,003998<\/span><\/li>\n<li> <span style=\"color: #000000;\"><strong>prac_exams<\/strong> : t = 2,7017, p = 0,030566<\/span><\/li>\n<\/ul>\n<p> <span style=\"color: #000000;\">Her t-testi i\u00e7in a\u015fa\u011f\u0131daki bo\u015f ve alternatif hipotezleri kulland\u0131\u011f\u0131m\u0131z\u0131 unutmay\u0131n:<\/span><\/p>\n<ul>\n<li> <span style=\"color: #000000;\"><strong>H <sub>0<\/sub><\/strong> : \u03b2 <sub>i<\/sub> = 0 (e\u011fim s\u0131f\u0131ra e\u015fittir)<\/span><\/li>\n<li> <span style=\"color: #000000;\"><strong>H <sub>A<\/sub><\/strong> : \u03b2 <sub>i<\/sub> \u2260 0 (e\u011fim s\u0131f\u0131ra e\u015fit de\u011fildir)<\/span><\/li>\n<\/ul>\n<p> <span style=\"color: #000000;\">T testinin p de\u011feri belirli bir e\u015fi\u011fin alt\u0131ndaysa (\u00f6rn. \u03b1 = 0,05), bo\u015f hipotezi reddederiz ve yorday\u0131c\u0131 de\u011fi\u015fken ile yan\u0131t de\u011fi\u015fkeni aras\u0131nda istatistiksel olarak anlaml\u0131 bir ili\u015fki oldu\u011fu sonucuna var\u0131r\u0131z.<\/span><\/p>\n<p> <span style=\"color: #000000;\">Her bir t-testi i\u00e7in p de\u011feri 0,05&#8217;ten k\u00fc\u00e7\u00fck oldu\u011fundan, modeldeki her yorday\u0131c\u0131 de\u011fi\u015fkenin yan\u0131t de\u011fi\u015fkeni ile istatistiksel olarak anlaml\u0131 bir ili\u015fkiye sahip oldu\u011fu sonucuna varabiliriz.<\/span><\/p>\n<p> <span style=\"color: #000000;\">Bu \u00f6rnek ba\u011flam\u0131nda, ders \u00e7al\u0131\u015fmak i\u00e7in harcanan saatlerin ve al\u0131nan uygulama s\u0131navlar\u0131n\u0131n say\u0131s\u0131n\u0131n, \u00f6\u011frencilerin final s\u0131nav notu \u00fczerinde istatistiksel olarak anlaml\u0131 belirleyiciler oldu\u011funu s\u00f6yleyebiliriz.<\/span><\/p>\n<h2> <span style=\"color: #000000;\"><strong>Ek kaynaklar<\/strong><\/span><\/h2>\n<p> <span style=\"color: #000000;\">A\u015fa\u011f\u0131daki e\u011fitimler R&#8217;deki do\u011frusal regresyon hakk\u0131nda ek bilgi sa\u011flar:<\/span><\/p>\n<p> <a href=\"https:\/\/statorials.org\/tr\/rdeki-regresyon-ciktisini-yorumla\/\" target=\"_blank\" rel=\"noopener\">R&#8217;de regresyon \u00e7\u0131kt\u0131s\u0131 nas\u0131l yorumlan\u0131r<\/a><br \/> <a href=\"https:\/\/statorials.org\/tr\/rde-basit-dogrusal-regresyon\/\" target=\"_blank\" rel=\"noopener\">R&#8217;de basit do\u011frusal regresyon nas\u0131l ger\u00e7ekle\u015ftirilir<\/a><br \/> <a href=\"https:\/\/statorials.org\/tr\/coklu-dogrusal-regresyon-r\/\" target=\"_blank\" rel=\"noopener\">R&#8217;de \u00e7oklu do\u011frusal regresyon nas\u0131l ger\u00e7ekle\u015ftirilir<\/a><br \/> R&#8217;de lojistik regresyon nas\u0131l ger\u00e7ekle\u015ftirilir<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Bir regresyon modelinde tahmin edilen her katsay\u0131 i\u00e7in bir t testi ger\u00e7ekle\u015ftirmek \u00fczere R&#8217;deki lmtest paketindeki coeftest() i\u015flevini kullanabilirsiniz. Bu i\u015flev a\u015fa\u011f\u0131daki temel s\u00f6zdizimini kullan\u0131r: ortaktest(x) Alt\u0131n: x : Uygun regresyon modelinin ad\u0131 A\u015fa\u011f\u0131daki \u00f6rnekte bu fonksiyonun pratikte nas\u0131l kullan\u0131laca\u011f\u0131 g\u00f6sterilmektedir. \u00d6rnek: R&#8217;de coeftest() i\u015flevi nas\u0131l kullan\u0131l\u0131r? R&#8217;de, bir s\u0131n\u0131ftaki 10 \u00f6\u011frencinin ders \u00e7al\u0131\u015fmak i\u00e7in [&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-3903","post","type-post","status-publish","format-standard","hentry","category-rehber"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v21.3 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>R - Statorialsde coeftest() i\u015flevi nas\u0131l kullan\u0131l\u0131r?<\/title>\n<meta name=\"description\" content=\"Bu e\u011fitimde, uygun bir regresyon modelinde her katsay\u0131 i\u00e7in t-testleri ger\u00e7ekle\u015ftirmek \u00fczere R&#039;deki coeftest() fonksiyonunun nas\u0131l kullan\u0131laca\u011f\u0131 a\u00e7\u0131klanmaktad\u0131r.\" \/>\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\/tr\/ortak-test-r\/\" \/>\n<meta property=\"og:locale\" content=\"tr_TR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"R - 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