Concurrent Validity of the Peabody Individual Achievement Test

The concurrent validity of the PIAT was investigated using the WRAT and WISC. Pearsonian correlations between the PIAT, WRAT, and selected WISC subtests, along with means and standard deviations for the WISC are presented for 40 children comprising Normal, Reading Disabled, and Mentally Retarded groups. Higher correlations were found between the reading subtests while only moderate correlations were found for the spelling and mathematics subtests. It was concluded that the PIAT may be used with the WRAT and WISC to facilitate differential diagnosis.