Examined temporal stability of Wechsler Intelligence Scale for Children-Revised (WISC-R) for adolescents (N=155) identified as either educable mentally retarded (EMR) or learning disabled (LD). Found three major scales of WISC-R to be more stable over three-year period for LD than for EMR group, while subtest scales for EMR group showed greater…

Learning disabled college students (N=16) were tested to compare the Wide Range Achievement Test (WRAT) with the Peabody Individual Achievement Test (PIAT). Significantly different scores are derived when WRAT norms are compared with PIAT norms, indicating that the tests are not interchangeable instruments for academic achievement. (RC)

Compares the performance of learning disabled students on the WISC-R and the Tests of Cognitive Abilities from the Woodcock-Johnson Psycho-Educational Battery. This study finds that learning disabled subjects performed more poorly on the Tests of Cognitive Abilities than on the WISC-R. (Author)

When conducting a profile analysis of the Peabody Individual Achievement Test, only those subtests in which the subtest specific variance equals or exceeds 25 percent of the total variance and exceeds error variance should be considered for interpretation. Behavioral factors and testing conditions also should be considered. (Author/BEF)

Explores the limitations associated with the expectancy formula approach, using a logical and mathematical analysis. Expectancy tables are predicted on the questionable assumption that achievement follows a straight line growth pattern. The approach is biased in the direction of applying a more stringent underachievement criterion for older,…

PPVT and WISC-R scores were compared for students ranging in age from 6 to 16. In descending order, Pearson product correlations ranked best for the total sample, emotionally disabled, regular class, mentally retarded, and learning disabled. The PPCT overestimated ability. (Author)