Background: Little is known about the nature, range and prevalence of different subgroups in language trajectories extant in a population from 4 to 11 years. This hinders strategic targeting and design of interventions, particularly targeting those whose difficulties will likely persist. Methods: Children's language abilities from 4 to 11 years…

Factor analyses of the WISC, ITPA, and PIAT, revealed that 85 percent of the total variance of these tests can be accounted for by an abbreviated battery of 12 of the 26 subtests. Results indicated a very tight relationship between academic achievement and academic aptitude, even in underachievers. (Author/SJL)

The thesis of this paper is that social class profoundly affects performance on IQ, aptitude, and specific school learning abilities and disabilities tests, and that a fair, quantitative measurement of socioeconomically depressed students is only possible with local or comparable norms. The controversial issue in such testing of students is the…

Individual differences in digit span, susceptibility to proactive interference, and various aptitude/achievement test scores were investigated in two experiments with college students. Results indicated that digit span was strongly correlated with aptitude/achievement scores, but did not indicate that susceptibility to proactive interference…

This comparison of regression discrepancy model results for learning disability identification used published IQ-achievement and reliability coefficients and generic, mean values. Use of mean IQ-achievement values resulted in higher discrepancy rates for a clinical sample. Use of both mean IQ-achievement and reliability values resulted in higher…

This study developed a normative core profile taxonomy of the four scholastic aptitude and corresponding achievement scales of the Woodcock-Johnson Psycho-Educational Battery (Revised). Cluster analysis was used to sort 2,620 students from the standardization sample. Results of internal and external validity analyses provided support for eight…

Results of applying different aptitude-achievement discrepancy models for test scores were compared for 150 second, 150 third, 150 fourth, and 130 fifth graders in several school systems in the Southeast who had been referred for psychoeducational testing for learning disabilities to determine whether different groups of students were identified…