Validity of three brief intelligence measures: The Wechsler Abbreviated Scale of Intelligence, the Kaufman Brief Intelligence Test, and the General Ability Measure for Adults

This study examined the construct and convergent validity of the General Ability Measure for Adults, the Wechsler Abbreviated Scale of Intelligence, and the Kaufman Brief Intelligence Test. Sixty college students participated in the study. The Pearson coefficients in the correlation matrix ranged from .01 to .87. The correlation between the WASI four-subtest Full Scale IQ standard score and the GAMA IQ standard score was significant. There was also a significant correlation between the K-BIT Composite IQ standard score and the GAMA IQ standard score. Although these relationships are significant, the correlation coefficients are moderate. Mean difference statistics reveal a significant difference between the means of the WASI and GAMA. In relation to the WASI, the GAMA overestimates intelligence scores for college students. It is concluded that the GAMA should not be used as an alternative to a comprehensive intelligence measure. Criterion validity scores suggest that the WASI has the highest predictability among the three measures. However, all three tests have moderate predictability.