Comparison of two methods for converting the WAIS to the WAIS-R

Two methods for converting WAIS scores to WAIS-R scores were investigated. One method subtracted the mean differences between the WAIS and WAIS-R IQs and subtests means from the WAIS scores. The other method converted the WAIS and WAIS-R scores to T scores. Theoretically, the two methods should produce equivalent results. Because the SDs for the WAIS and WAIS-R were quite similar, the only components that remained to produce the difference were the means. Using 52 pairs of WAIS and WAIS-R scores, matched by age and education, both methods were compared. There was no statistically significant difference between the methods. Two new norming methods were discussed in terms of these results.