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Test-retest reliability is a statistical method used to examine how reliable a test is: A test is performed twice, e.g., the same test is given to a group of subjects at two different times. Each subject should score different than the other subjects, but if the test is reliable then each subject should score the same in both test.
Test-retest reliability, is estimated as the Pearson product-moment correlation coefficient between two administrations of the same measure. This is sometimes known as the coefficient of stability