Seven discriminant analyses were performed with significant group separation occurring for six of these. Classification analyses indicated that using the 10 major subtests produced accurate classification in approximately 71 percent of cases. Results were discussed in the light of previous research methodologies and the debate as to the…

Numerical classification techniques were used to explore the conjecture that inconsistent results of many studies of disabled readers could result from samples being composed of subgroups of children with different characteristics. Some five subgroups were identified using ITPA scores from a subsample of 37 poor readers. (Author)

The discriminant validity of two subscales of the Reynell Developmental Language Scales (RDLS) was investigated using data from 225 children given the RDLS at age 4 and the Illinois Test of Psycholinguistic Abilities at age 5. Results support the hypothesis; the RDLS scales measure distinct but correlated language abilities. (SLD)