text: How do you calculate test retest reliability? – Princeharrymemorial.com
  How do you calculate test retest reliability?
  Home Guidelines How do you calculate test retest reliability?
  Test-Retest Reliability (sometimes called retest reliability) measures test consistency the reliability of a test measured over time. In other words, give the same test twice to the same people at different times to see if the scores are the same. For example, test on a Monday, then again the following Monday.
  How do you test retest reliability in SPSS?
  The steps for conducting test-retest reliability in SPSSThe data is entered in a within-subjects fashion.Click Analyze.Drag the cursor over the Correlate drop-down menu.Click on Bivariate.Click on the baseline observation, pre-test administration, or survey score to highlight it.
  What is testing threat to internal validity?
  Factors which jeopardize internal validity Testing–the effects of taking a test on the outcomes of taking a second test. Instrumentation–the changes in the instrument, observers, or scorers which may produce changes in outcomes. Statistical regression–It is also known as regression to the mean.