An Examination of the Convergent Validity of the ICAR16 and WAIS-IV

The construct validity of the International Cognitive Ability Resource (ICAR) has yet to be investigated using a gold-standard individually administered intelligence battery. The present study used a convenience sample of 97 students to examine the respective relations between the ICAR16 and overall intelligence ( g) and the Cattell–Horn–Carroll broad abilities measured by the WAIS-IV. Large correlations were observed between the observed overall scores (rICAR16, full-scale IQ = .81, p < .001) and the CFA-estimated general factors ( r = .94, p < .001). Evidence from confirmatory factor models suggests that the ICAR letter–number Series task measures fluid reasoning, while the matrix reasoning, verbal reasoning, and three-dimensional reasoning tasks measure visual–spatial reasoning (Gv). Findings support the ICAR16 as a valid brief measure of nonverbal intelligence; however, replications in larger samples are needed.