The WISC-R factoral validity for minority groups and Spearman's hypothesis

The factoral structure of the WISC-R for groups of Anglo, Black, and Mexican-American children was compared and found to be highly similar across groups. The tests appear to be measuring the same abilities in all three groups. The order of subtest difficulty was not significantly correlated with the subtest g loadings for the Black children but was for the Mexican-Americans. These results provide support for Spearman's hypothesis with Mexican-American children.