Concurrent Validity of the Peabody Individual Achievement Test and the Wide Range Achievement Test

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Abstract
The Peabody, Wide Range, and Stanford or Metropolitan Achievement Tests were administered to 28 economically deprived students in Grades 1 to 3 and 28 in Grades 4 to 6 to evaluate the concurrent validity of the Peabody and Wide Range tests. At Grades 1 to 3 the Peabody correlated highly with the group tests ( rho = .79—.87) except in reading comprehension; the Wide Range produced even higher correlations (.86—.92) with reading comprehension again notably lower. At Grades 4 to 6 the Peabody correlations were much lower (.36—.68) as were those for the Wide Range scores (.42—.62). Individually calculated discrepancy scores between the individual and group tests showed significantly ( ps < .05) larger discrepancies at Grades 4 to 6 than at Grades 1 to 3 in most achievement areas. The Peabody had discrepancy means of about two-thirds a grade equivalent on most subtests, and the Wide Range means were less than one-half a grade equivalent (except in reading) at Grades 1 to 3; at Grades 4 to 6 the discrepancy means were typically in excess of one grade equivalent on both tests. Both tests were judged adequate for diagnostic screening purposes at Grades 1 to 3 except in reading comprehension, however, both tests appeared inadequate as screening instruments at Grades 4 to 6 with this type of subject.

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