A critique of Wechsler's deterioration formula for the WAIS is offered because it neglected the important matter of significant sex differences in intellectual abilities and because it did not make optimal use of the differential test score method. Two revised formulae were devised, one for males and one for females. The female formula was much more successful than Wechsler's in maximizing deterioration slope. Recommendation is made to use the WAIS formula for men and the revised formula for women.
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