Test retest reliability psychology5/20/2023 Example: Calculating Test-Retest Reliability Generally a test-retest reliability correlation of at least 0.80 or higher indicates good reliability. We could calculate the correlation of scores between the two tests to determine if the test has good test-retest reliability. 1 indicates a perfectly positive linear correlation between two scoresįor example, we may give an IQ test to 50 participants on January 1st and then give the same type of IQ test of similar difficulty to the same group of 50 participants one month later.
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