Direct comparisons of the factor structures of the WISC and the WISC-R

The factor structures of the WISC and the WISC-R were compared, using the data for age groups 7.5, 10.5, and 13.5 years in the two standardization samples. The results for three different types of solution—hierarchical, multiple-group, and principal-factor—agreed in demonstrating that the structures of the two scales are as similar as the structure of either scale is for different age groups.