{"id":4524,"date":"2023-07-10T09:48:32","date_gmt":"2023-07-10T09:48:32","guid":{"rendered":"https:\/\/statorials.org\/id\/transformasi-log-di-airlock\/"},"modified":"2023-07-10T09:48:32","modified_gmt":"2023-07-10T09:48:32","slug":"transformasi-log-di-airlock","status":"publish","type":"post","link":"https:\/\/statorials.org\/id\/transformasi-log-di-airlock\/","title":{"rendered":"Cara melakukan transformasi log di sas"},"content":{"rendered":"<p><span style=\"color: #000000;\">Banyak uji statistik yang mengasumsikan bahwa nilai suatu variabel tertentu <a href=\"https:\/\/statorials.org\/id\/hipotesis-normalitas\/\" target=\"_blank\" rel=\"noopener\">terdistribusi normal<\/a> .<\/span><\/p>\n<p> <span style=\"color: #000000;\">Namun <em>seringkali nilainya tidak<\/em> terdistribusi normal. Salah satu cara untuk mengatasi masalah ini adalah dengan mentransformasikan variabel dengan mengambil log dari setiap nilai.<\/span><\/p>\n<p> <span style=\"color: #000000;\">Dengan melakukan transformasi ini, suatu variabel secara umum mendekati distribusi normal.<\/span><\/p>\n<p> <span style=\"color: #000000;\">Contoh berikut menunjukkan cara melakukan transformasi log pada variabel di SAS.<\/span><\/p>\n<h2> <span style=\"color: #000000;\"><strong>Contoh: Transformasi Log di SAS<\/strong><\/span><\/h2>\n<p> <span style=\"color: #000000;\">Anggaplah kita memiliki kumpulan data berikut di SAS:<\/span> <\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #008000;\">\/*create dataset*\/\n<\/span><span style=\"color: #800080;\">data<\/span> my_data;\n    <span style=\"color: #3366ff;\">input<\/span> x;\n    <span style=\"color: #3366ff;\">datalines<\/span> ;\n1\n1\n1\n2\n2\n2\n2\n2\n2\n3\n3\n3\n6\n7\n8\n;\n<span style=\"color: #800080;\">run<\/span> ;\n\n<span style=\"color: #008000;\">\/*view dataset*\/\n<\/span><span style=\"color: #800080;\">proc print<\/span> <span style=\"color: #3366ff;\">data<\/span> =my_data;\n<\/strong><\/pre>\n<p><img decoding=\"async\" loading=\"lazy\" class=\" wp-image-35355 aligncenter\" src=\"https:\/\/statorials.org\/wp-content\/uploads\/2023\/08\/journaux1.png\" alt=\"\" width=\"83\" height=\"399\" srcset=\"\" sizes=\"\"><\/p>\n<p> <span style=\"color: #000000;\">Kita dapat menggunakan <a href=\"https:\/\/statorials.org\/id\/sas-proc-uji-normalitas-univariat\/\" target=\"_blank\" rel=\"noopener\">PROC UNIVARIATE<\/a> untuk melakukan uji normalitas pada variabel x untuk menentukan apakah variabel tersebut terdistribusi normal dan juga membuat histogram untuk memvisualisasikan distribusi nilai:<\/span> <\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <span style=\"color: #000000;\"><strong><span style=\"color: #008000;\">\/*create histogram and perform normality tests*\/\n<\/span><span style=\"color: #800080;\">proc univariate<\/span> <span style=\"color: #3366ff;\">data<\/span> =my_data <span style=\"color: #3366ff;\">normal<\/span> ; \n<span style=\"color: #3366ff;\">histogram<\/span> x;\n<span style=\"color: #800080;\">run<\/span> ;<\/strong><\/span> <\/pre>\n<p><img decoding=\"async\" loading=\"lazy\" class=\" wp-image-35356 aligncenter\" src=\"https:\/\/statorials.org\/wp-content\/uploads\/2023\/08\/journaux2.png\" alt=\"\" width=\"474\" height=\"737\" srcset=\"\" sizes=\"\"><\/p>\n<p> <span style=\"color: #000000;\">Pada tabel terakhir yang berjudul <strong>Uji Normalitas<\/strong> , kita dapat melihat bahwa <a href=\"https:\/\/statorials.org\/id\/p-menghargai-signifikansi-statistik\/\" target=\"_blank\" rel=\"noopener\">nilai p<\/a> dari uji Shapiro-Wilk kurang dari 0,05, yang memberikan bukti kuat bahwa variabel <strong>x<\/strong> tidak terdistribusi normal.<\/span><\/p>\n<p> <span style=\"color: #000000;\">Histogram juga menunjukkan bahwa sebaran nilai tampak tidak terdistribusi normal:<\/span> <\/p>\n<p><img decoding=\"async\" loading=\"lazy\" class=\" wp-image-35357 aligncenter\" src=\"https:\/\/statorials.org\/wp-content\/uploads\/2023\/08\/journaux3.png\" alt=\"\" width=\"620\" height=\"488\" srcset=\"\" sizes=\"\"><\/p>\n<p> <span style=\"color: #000000;\">Kita dapat mencoba <strong>transformasi log<\/strong> pada kumpulan data asli untuk melihat apakah kita dapat menghasilkan kumpulan data yang lebih terdistribusi secara normal.<\/span><\/p>\n<p> <span style=\"color: #000000;\">Kita dapat menggunakan kode berikut untuk membuat kumpulan data baru di SAS tempat kita mengambil log dari setiap nilai x asli:<\/span> <\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <span style=\"color: #000000;\"><strong><span style=\"color: #008000;\">\/*use log transformation to create new dataset*\/\n<\/span><span style=\"color: #800080;\">data<\/span> log_data;\n    <span style=\"color: #3366ff;\">set<\/span> my_data;\n    x = <span style=\"color: #3366ff;\">log<\/span> (x);\n<span style=\"color: #800080;\">run<\/span> ;\n\n<span style=\"color: #008000;\">\/*view log transformed data*\/\n<\/span><span style=\"color: #800080;\">proc print<\/span> <span style=\"color: #3366ff;\">data<\/span> =log_data;<\/strong><\/span> <\/pre>\n<p><img decoding=\"async\" loading=\"lazy\" class=\" wp-image-35358 aligncenter\" src=\"https:\/\/statorials.org\/wp-content\/uploads\/2023\/08\/journaux4.png\" alt=\"\" width=\"132\" height=\"425\" srcset=\"\" sizes=\"\"><\/p>\n<p> <span style=\"color: #000000;\">Kita kemudian dapat menggunakan <strong>PROC UNIVARIATE<\/strong> lagi untuk melakukan uji normalitas pada variabel yang diubah dan juga menghasilkan histogram:<\/span> <\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <span style=\"color: #000000;\"><strong><span style=\"color: #008000;\">\/*create histogram and perform normality tests*\/\n<\/span><span style=\"color: #800080;\">proc univariate<\/span> <span style=\"color: #3366ff;\">data<\/span> =log_data <span style=\"color: #3366ff;\">normal<\/span> ; \n<span style=\"color: #3366ff;\">histogram<\/span> x;\n<span style=\"color: #800080;\">run<\/span> ;<\/strong><\/span> <\/pre>\n<p><img decoding=\"async\" loading=\"lazy\" class=\" wp-image-35359 aligncenter\" src=\"https:\/\/statorials.org\/wp-content\/uploads\/2023\/08\/journaux5.png\" alt=\"\" width=\"443\" height=\"710\" srcset=\"\" sizes=\"\"><\/p>\n<p> <span style=\"color: #000000;\">Pada tabel terakhir yang berjudul <strong>Uji Normalitas,<\/strong> kita dapat melihat bahwa <a href=\"https:\/\/statorials.org\/id\/p-menghargai-signifikansi-statistik\/\" target=\"_blank\" rel=\"noopener\">nilai p<\/a> untuk uji Shapiro-Wilk kini lebih besar dari 0,05.<\/span><\/p>\n<p> <span style=\"color: #000000;\">Histogram juga menunjukkan bahwa distribusi nilai sedikit lebih normal dibandingkan sebelum transformasi:<\/span> <\/p>\n<p><img decoding=\"async\" loading=\"lazy\" class=\" wp-image-35360 aligncenter\" src=\"https:\/\/statorials.org\/wp-content\/uploads\/2023\/08\/journaux6.png\" alt=\"\" width=\"530\" height=\"426\" srcset=\"\" sizes=\"\"><\/p>\n<p> <span style=\"color: #000000;\">Berdasarkan hasil uji Shapiro-Wilk dan histogram yang disajikan di atas, kita dapat menyimpulkan bahwa transformasi logaritmik menghasilkan variabel yang jauh lebih terdistribusi normal dibandingkan variabel aslinya.<\/span><\/p>\n<h2> <span style=\"color: #000000;\"><strong>Sumber daya tambahan<\/strong><\/span><\/h2>\n<p> <span style=\"color: #000000;\">Tutorial berikut menjelaskan cara melakukan tugas umum lainnya di SAS:<\/span><\/p>\n<p> <a href=\"https:\/\/statorials.org\/id\/seperti-outlier\/\" target=\"_blank\" rel=\"noopener\">Cara mengidentifikasi outlier di SAS<\/a><br \/> <a href=\"https:\/\/statorials.org\/id\/juru-masak-jarak-jauh-di-airlock\/\" target=\"_blank\" rel=\"noopener\">Cara menghitung jarak masak di SAS<\/a><br \/> <a href=\"https:\/\/statorials.org\/id\/histogram-kunci-udara\/\" target=\"_blank\" rel=\"noopener\">Cara Membuat Histogram di SAS<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Banyak uji statistik yang mengasumsikan bahwa nilai suatu variabel tertentu terdistribusi normal . Namun seringkali nilainya tidak terdistribusi normal. Salah satu cara untuk mengatasi masalah ini adalah dengan mentransformasikan variabel dengan mengambil log dari setiap nilai. Dengan melakukan transformasi ini, suatu variabel secara umum mendekati distribusi normal. Contoh berikut menunjukkan cara melakukan transformasi log pada [&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":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v21.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Cara melakukan transformasi log di SAS - Statorials<\/title>\n<meta name=\"description\" content=\"Tutorial ini menjelaskan cara melakukan transformasi log di SAS, dengan sebuah contoh.\" \/>\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\/id\/transformasi-log-di-airlock\/\" \/>\n<meta property=\"og:locale\" content=\"id_ID\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Cara melakukan transformasi log di SAS - Statorials\" \/>\n<meta property=\"og:description\" content=\"Tutorial ini menjelaskan cara melakukan transformasi log di SAS, dengan sebuah contoh.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/statorials.org\/id\/transformasi-log-di-airlock\/\" \/>\n<meta property=\"og:site_name\" content=\"Statorials\" \/>\n<meta property=\"article:published_time\" content=\"2023-07-10T09:48:32+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/statorials.org\/wp-content\/uploads\/2023\/08\/journaux1.png\" \/>\n<meta name=\"author\" content=\"Benjamin anderson\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Ditulis oleh\" \/>\n\t<meta name=\"twitter:data1\" content=\"Benjamin anderson\" \/>\n\t<meta name=\"twitter:label2\" content=\"Estimasi waktu membaca\" \/>\n\t<meta name=\"twitter:data2\" content=\"2 menit\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/statorials.org\/id\/transformasi-log-di-airlock\/\",\"url\":\"https:\/\/statorials.org\/id\/transformasi-log-di-airlock\/\",\"name\":\"Cara melakukan transformasi log di SAS - Statorials\",\"isPartOf\":{\"@id\":\"https:\/\/statorials.org\/id\/#website\"},\"datePublished\":\"2023-07-10T09:48:32+00:00\",\"dateModified\":\"2023-07-10T09:48:32+00:00\",\"author\":{\"@id\":\"https:\/\/statorials.org\/id\/#\/schema\/person\/3d17a1160dd2d052b7c78e502cb9ec81\"},\"description\":\"Tutorial ini menjelaskan cara melakukan transformasi log di SAS, dengan sebuah contoh.\",\"breadcrumb\":{\"@id\":\"https:\/\/statorials.org\/id\/transformasi-log-di-airlock\/#breadcrumb\"},\"inLanguage\":\"id\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/statorials.org\/id\/transformasi-log-di-airlock\/\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/statorials.org\/id\/transformasi-log-di-airlock\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\/\/statorials.org\/id\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Cara melakukan transformasi log di sas\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\/\/statorials.org\/id\/#website\",\"url\":\"https:\/\/statorials.org\/id\/\",\"name\":\"Statorials\",\"description\":\"Panduan anda untuk kompetensi statistik!\",\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\/\/statorials.org\/id\/?s={search_term_string}\"},\"query-input\":\"required name=search_term_string\"}],\"inLanguage\":\"id\"},{\"@type\":\"Person\",\"@id\":\"https:\/\/statorials.org\/id\/#\/schema\/person\/3d17a1160dd2d052b7c78e502cb9ec81\",\"name\":\"Benjamin anderson\",\"image\":{\"@type\":\"ImageObject\",\"inLanguage\":\"id\",\"@id\":\"https:\/\/statorials.org\/id\/#\/schema\/person\/image\/\",\"url\":\"http:\/\/statorials.org\/id\/wp-content\/uploads\/2023\/10\/Dr.-Benjamin-Anderson-96x96.jpg\",\"contentUrl\":\"http:\/\/statorials.org\/id\/wp-content\/uploads\/2023\/10\/Dr.-Benjamin-Anderson-96x96.jpg\",\"caption\":\"Benjamin anderson\"},\"description\":\"Halo, saya Benjamin, pensiunan profesor statistika yang menjadi guru Statorial yang berdedikasi. 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