SHORT FORMS OF THE WECHSLER MEMORY SCALE REVISED - CROSS-VALIDATION AND DERIVATION OF A 2-SUBTEST-FORM

Revised General Memory and Delayed Recall Indexes using the initial an d delayed portions of only 3 subtests. The original work found nearly perfect estimates. The present study indicated excellent cross-validat ion for the original formulas with correlations of .99. Over 85% of th e estimated scores were within 6 points of the actual score. Using est imates from only 2 subtests rather than 3, correlations were only. sli ghtly lower with 85% of the estimated scores within 10 points of the a ctual scores. Age, education, diagnosis, and IQ had no effects on the accuracy of these equations. Although the initial 3 test formulas are robust, the results suggest that using only 2 subtests results in high er estimation errors, which can be used when less accurate estimates a re acceptable (such as in group research).