{"id":1018,"date":"2014-12-09T21:00:55","date_gmt":"2014-12-09T20:00:55","guid":{"rendered":"http:\/\/stg-blogs.bmj.com\/adc\/?p=1018"},"modified":"2014-12-02T17:49:54","modified_gmt":"2014-12-02T16:49:54","slug":"statsminiblog-cronhachs-alpha","status":"publish","type":"post","link":"https:\/\/stg-blogs.bmj.com\/adc\/2014\/12\/09\/statsminiblog-cronhachs-alpha\/","title":{"rendered":"StatsMiniBlog: Cronbach&#8217;s alpha"},"content":{"rendered":"<p><a href=\"https:\/\/stg-blogs.bmj.com\/adc\/files\/2013\/08\/Image78.gif\"><img loading=\"lazy\" decoding=\"async\" class=\"alignleft size-full wp-image-674\" src=\"https:\/\/stg-blogs.bmj.com\/adc\/files\/2013\/08\/Image78.gif\" alt=\"StatsMiniBlog\" width=\"180\" height=\"76\" \/><\/a>When you&#8217;re next handing out your questionnaire in clinic, or on the wards, or sit out in the library assessing the results of a recent clinical study, will you be asking about the quality of the questionnaire you&#8217;re using or reading about?<\/p>\n<p>Of course. I should have realised you will.<\/p>\n<p>Though you might just have a little niggle about what the\u00a0Cronbach&#8217;s alpha actually means &#8230;<\/p>\n<p>Well, it&#8217;s a measure of internal consistency &#8211; that is,\u00a0an assessment of how much the rating scale in question seems to measure the same thing. It works by comparing the variances of the results of each &#8216;item&#8217; (test question, often) with the variance of the overall scale, across a population of folk. If the &#8216;items&#8217;\u00a0are all measuring the same thing, \u00a0then the alpha value is high (generally speaking, &gt;0.7 has been taken as &#8216;good&#8217; internal consistency).<\/p>\n<p>&#8211; Archi<!--TrendMD v2.4.8--><\/p>\n","protected":false},"excerpt":{"rendered":"<p>When you&#8217;re next handing out your questionnaire in clinic, or on the wards, or sit out in the library assessing the results of a recent clinical study, will you be asking about the quality of the questionnaire you&#8217;re using or reading about? Of course. I should have realised you will. Though you might just have [&#8230;]<\/p>\n<p><a class=\"btn btn-secondary understrap-read-more-link\" href=\"https:\/\/stg-blogs.bmj.com\/adc\/2014\/12\/09\/statsminiblog-cronhachs-alpha\/\">Read More&#8230;<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[2676],"tags":[],"class_list":["post-1018","post","type-post","status-publish","format-standard","hentry","category-stats"],"jetpack_featured_media_url":"","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/stg-blogs.bmj.com\/adc\/wp-json\/wp\/v2\/posts\/1018","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/stg-blogs.bmj.com\/adc\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/stg-blogs.bmj.com\/adc\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/stg-blogs.bmj.com\/adc\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/stg-blogs.bmj.com\/adc\/wp-json\/wp\/v2\/comments?post=1018"}],"version-history":[{"count":0,"href":"https:\/\/stg-blogs.bmj.com\/adc\/wp-json\/wp\/v2\/posts\/1018\/revisions"}],"wp:attachment":[{"href":"https:\/\/stg-blogs.bmj.com\/adc\/wp-json\/wp\/v2\/media?parent=1018"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/stg-blogs.bmj.com\/adc\/wp-json\/wp\/v2\/categories?post=1018"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/stg-blogs.bmj.com\/adc\/wp-json\/wp\/v2\/tags?post=1018"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}