David Hughes

Publication Date


Advisor(s) - Committee Chair

David Shiek, Clinton Layne, and Lois Layne

Degree Program

Department of Psychology


The purpose of the study was to compare the Peabody Picture Vocabulary Test (PPVT) and the Wechsler Intelligence Scale for Children-Revised (WISC-R) in an effort to establish an estimate of the similarity between the two measures. The sample included 194 nine, ten, and eleven year old children referred to the University’s Psychological Clinic. There were 100 males and 94 females with a mean age of 10 years and six months. Out of the 194 children, 106 were white, 46 black and 42 of unknown race. Pearson Product Moment Correlations were performed between the PPVT IQ and the WISC-R variables. As a result of frequent clinical comparisons, t tests of the mean z scores between the WISC-R Verbal, Full Scale and Vocabulary measures and PPVT measures were also done. Correlations between the PPVT and WISC-R variables yielded validity coefficients significant at or beyond the .001 level. Generally the Verbal Scale variables correlated more highly with the PPVT than the Performance Scale variables. The analysis of the differences between the mean z scores indicated a significant difference between the PPVT and the Verbal, Full Scale and the Vocabulary variables. These differences were significant at or beyond the .01 level of confidence. Even though a significant was obtained between the mean scores, for practical use a direct interpretation would appear possible between the two tests in that the mean scores were within two IQ points of each other.


Education | Pre-Elementary, Early Childhood, Kindergarten Teacher Education | Reading and Language