Abstract
A comparative inspection of the WAIS and WAIS-R IQ tables in their respective manuals indicated that there would be variable IQ discrepancies at different ages because of differential age adjustments on the norms of the two scales. The use of equivalent WAIS and WAIS-R sums of scaled scores derived from Wechsler's (1981) comparison of the two instruments to determine comparable IQs on the two tests at different ages demonstrated the predicted variable discrepancies. It was concluded that it would be fruitless to attempt to equate WAIS and WAIS-R IQs directly but that the process could be achieved by the equation of sums of scaled scores on the two instruments and the use of the tables in both test manuals to obtain the WAIS and WAIS-R IQs representing the same levels of ability at different ages.
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