Convergent Validity of the Reynolds Intellectual Assessment Scales (RIAS) using the Woodcock-Johnson Tests of Cognitive Ability, Third Edition (WJ-III) with university students.

Validity studies with the Reynolds Intellectual Ability Scales (RIAS) indicate that RIAS Composite Intelligence Index (CIX) and Verbal Intelligence Index (VIX) scores have moderate to high correlation with comparable scores on other instruments. The authors of the RIAS describe the VIX scale as a measure of crystallized ability and the Nonverbal Index (NIX) as a measure of fluid ability, but no studies are available comparing the VIX and NIX scores with an established measure of these abilities. And, no studies specifically addressed the utility of the RIAS with a university population. The current study examined RIAS scores of university students in comparison to scores on the Woodcock-Johnson Tests of Cognitive Ability, Third Edition (WJ-III). Consistent with previous studies, there were moderate to high correlations between the CIX and VIX scores and corresponding scores on the WJ-III. A substantially lower correlation was evident between the NIX and WJ-III fluid ability scores.