AbstractTest‐retest reliability data gathered from 79 sources (34 separate studies) were analyzed by a multiple‐regression method in an attempt to estimate the effects of several factors on the temporal stability of individually tested intelligence. Five intelligence tests were examined: the Standford‐Binet (except the fourth edition), the WISC, the WISC‐R, the WAIS, and the WAIS‐R. Samples encompassed a wide range of subjects divergent on status, age, and sample size. Subject age and status, gender, and test‐retest interval were evaluated, and age and interval were found to be significant predictors of reliability. Subject sex and specific instrument were not found to have a significant effect on reliability. A summary table provides expected reliability coefficients, standard error, and percent of persons with IQ change in excess of 15 points, tabulated for combinations of each of the two
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