{"id":9764,"date":"2023-05-03T03:26:50","date_gmt":"2023-05-03T03:26:50","guid":{"rendered":"https:\/\/support.divominer.com\/en\/docs\/divominer-user-manual\/advanced-statistics\/reliability-analysis-2\/"},"modified":"2023-11-08T03:34:51","modified_gmt":"2023-11-08T03:34:51","slug":"reliability-analysis-2","status":"publish","type":"docs","link":"https:\/\/support.divominer.com\/en\/docs\/divominer-user-manual\/advanced-statistics\/reliability-analysis-2\/","title":{"rendered":"Reliability analysis"},"content":{"rendered":"\n<p>Reliability analysis is a method to assess the consistency and dependability of the responses to questions in a questionnaire that uses scales. It is used to verify if the sample has provided accurate answers to the scale questions. Reliability analysis is not typically performed on non-scale data. The most used coefficient for measuring internal consistency reliability is Cronbach&#8217;s alpha, which shows the level of consistency among the responses to the items in a scale. The formula for Cronbach&#8217;s alpha is:<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" width=\"215\" height=\"58\" src=\"https:\/\/support.divominer.com\/en\/wp-content\/uploads\/2023\/05\/4.png\" alt=\"\" class=\"wp-image-9765\" srcset=\"https:\/\/support.divominer.com\/en\/wp-content\/uploads\/2023\/05\/4.png 215w, https:\/\/support.divominer.com\/en\/wp-content\/uploads\/2023\/05\/4-50x13.png 50w\" sizes=\"(max-width: 215px) 100vw, 215px\" \/><\/figure>\n\n\n\n<p>The formula for Cronbach&#8217;s alpha reliability coefficient includes &#8220;k&#8221;, which represents the number of items measured, &#8220;Si^2&#8221;, which is the variance of the score for the i-th question, and &#8220;Sx^2&#8221;, which is the variance of the total test score. A reliability coefficient above 0.8 indicates that the scale is highly reliable, while a coefficient above 0.7 is acceptable. If the coefficient is above 0.6, it is necessary to modify the scale, but if it is less than 0.6, the scale requires significant changes.<\/p>\n\n\n\n<p><strong>References:<\/strong><\/p>\n\n\n\n<ul type=\"1\"><li>Lambert, M. J., Burlingame, G. M., Umphress, V., Hansen, N. B., Vermeersch, D. A., Clouse, G. C., &amp; Yanchar, S. C. (1996). The reliability and validity of the Outcome Questionnaire. Clinical Psychology &amp; Psychotherapy: <em>An International Journal of Theory and Practice<\/em>, <em>3<\/em>(4), 249-258.<\/li><li>Taherdoost, H. (2016). Validity and reliability of the research instrument: How to test the validation of a questionnaire\/survey in research. <em>Electronic Physician<\/em>, <em>8<\/em>(9), 3150-3155.<\/li><li>Henson, R. K., &amp; Roberts, J. K. (2006). Use of exploratory factor analysis in published research: Common errors and some comment on improved practice.&nbsp;<em>Educational and Psychological measurement<\/em>,&nbsp;<em>66<\/em>(3), 393-416..<\/li><\/ul>\n","protected":false},"featured_media":0,"parent":9138,"menu_order":14,"comment_status":"open","ping_status":"closed","template":"","doc_tag":[],"_links":{"self":[{"href":"https:\/\/support.divominer.com\/en\/wp-json\/wp\/v2\/docs\/9764"}],"collection":[{"href":"https:\/\/support.divominer.com\/en\/wp-json\/wp\/v2\/docs"}],"about":[{"href":"https:\/\/support.divominer.com\/en\/wp-json\/wp\/v2\/types\/docs"}],"replies":[{"embeddable":true,"href":"https:\/\/support.divominer.com\/en\/wp-json\/wp\/v2\/comments?post=9764"}],"version-history":[{"count":2,"href":"https:\/\/support.divominer.com\/en\/wp-json\/wp\/v2\/docs\/9764\/revisions"}],"predecessor-version":[{"id":10004,"href":"https:\/\/support.divominer.com\/en\/wp-json\/wp\/v2\/docs\/9764\/revisions\/10004"}],"up":[{"embeddable":true,"href":"https:\/\/support.divominer.com\/en\/wp-json\/wp\/v2\/docs\/9138"}],"next":[{"title":"Create a new reliability analysis task","link":"https:\/\/support.divominer.com\/en\/docs\/divominer-user-manual\/advanced-statistics\/create-a-new-reliability-analysis-task\/","href":"https:\/\/support.divominer.com\/en\/wp-json\/wp\/v2\/docs\/9828"}],"prev":[{"title":"Create a new K-Means clustering (numeric) task","link":"https:\/\/support.divominer.com\/en\/docs\/divominer-user-manual\/advanced-statistics\/create-a-new-k-means-clustering-numeric-task\/","href":"https:\/\/support.divominer.com\/en\/wp-json\/wp\/v2\/docs\/9825"}],"wp:attachment":[{"href":"https:\/\/support.divominer.com\/en\/wp-json\/wp\/v2\/media?parent=9764"}],"wp:term":[{"taxonomy":"doc_tag","embeddable":true,"href":"https:\/\/support.divominer.com\/en\/wp-json\/wp\/v2\/doc_tag?post=9764"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}