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1 The Vocational and Rehabilitation Research Institute, Calgary, Alberta, Canada
A total of 154 adults with developmental handicaps involved in a comprehensive community-based habilitation program were tested on alternate forms of the PPVT and PPVTRevised to determine intertest reliabilities. A comparison of response profiles indicated that there was a significant degree of correspondence in general performance using alternate forms (p < .0001). This correspondence was maintained regardless of whether overall raw score or mental age equivalents were used. However, a comparison of performance on individual test items that were identical on alternate forms showed less consistent results. Particular aspects of the administration and structure of the PPVT/PPVTR and response characteristics of individuals with developmental handicaps are suggested as being important factors in test administration and interpretation with this population.
Submitted on July 16, 1985
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