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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. The two scores are then correlated.
Bias is a known problem with this type of reliability test, due to:Feedback between tests,Participants gaining knowledge about the purpose of the test, so they are more prepared the second time around.Even if a test-retest reliability process is applied with no sign of intervening factors, there will always be some degree of error. There is a strong chance that subjects will remember some of the questions from the previous test and perform better.
Instruments such as IQ tests and surveys are prime candidates for test-retest methodology, because there is little chance of people experiencing a sudden jump in IQ or suddenly changing their opinions.
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Statistics, Correlation and dependence, Pearson product-moment correlation coefficient, Covariance and correlation, Spearman's rank correlation coefficient