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Statistical Tools for Research ---SPSS (2) . Reliability can take on values of 0 to 1.0, inclusive. The calculation of test-retest reliability is straightforward. As Thom Baguley indicates, that is the classic method for test-retest reliability your test is cronbach's alpha. in SpssAnalyze> Scale> Reliability analysis. Test-retest reliability is used to assess the stability of survey scores across time. Use and interpret test-retest reliability and Spearman-Brown in SPSS. We investigated item-level test-retest reliability using Svensson's rank-based . Another group of wheelchair users alternates between using manual and electric . Statistical analyses on the total score level were performed using IBM-SPSSReliability. Types of Reliability. There are three types of reliability: test-retest reliability; interrater reliability; internal consistency reliability (coefficient alpha) 15 Feb 2006 Reliability: the fact that a scale should consistently reflect the construct it is if they complete it at two different points in time (test-retest . each person, but we can get SPSS to do it for us by using Transform?Compute 15 Oct 2011 To test for factor or internal validity of a questionnaire in SPSS use factor analysis (under data reduction menu). If the factor structure is similar to what you Step-by-step instructions on how to run Cronbach's Alpha in SPSS Statistics using a If you are concerned with inter-rater reliability, we also have a guide on using a Cronbach's alpha test, see our Entering Data into SPSS Statistics tutorial.