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Assessment
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The Validity of the General Ability Measure for Adults TM: Comparison with WAIS-R IQ Scores in A Sample of College Students with Academic Difficulties

Kerry S. Lassiter

J. Patrick Leverett

Tharwat A. Safa

The Citadel

The present study investigated the validity of the General Ability Measure for Adults (GAMA1) by comparing it to the WAIS-R using a sample of 80 college students reporting learning difficulties. Results indicated that the mean GAMA IQ score did not deviate significantly from the mean WAIS-R IQ scores. The GAMA Full Scale IQ correlated significantly with the WAIS-R PIQ VIQ, and FSIQ scores. However, the obtained correlation coefficient for the GAMA and WAIS-R PIQ significantly differed from the observed correlation coefficient between the GAMA and WAIS-R VIQ, suggesting that the GAMA was more clearly associated with perceptual skills than verbal abilities. When the correlation coefficients between the GAMA and WAIS-R scores were corrected for the effects of range restriction, the correlation coefficients increased, yet demonstrated the same pattern (e.g., GAMA/PIQ, .69; GAMA/VIQ, .36; GAMA/FSIQ, .60). The GAMA's accuracy in predicting individual student performance on the WAIS-R FSIQ also was examined.

Key Words: Validity • GAMA • Wechsler scales • learning disability assessment • visual-spatial ability • measurement

Assessment, Vol. 7, No. 1, 63-72 (2000)
DOI: 10.1177/107319110000700105
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