The Stability Of The Wisc Factor Structure At Three Age Levels

The WISC, Peabody Picture Vocabulary Test, and Ammons' Full Range Picture Vocabulary Test were administered to a sample of 216 children three times: at pre-school, first grade, and third grade levels. The sample included 91 Negro children and 126 white children. Twenty-six variables were developed from the 11 WISC tests to form as many variables as possible so that a total of 28 variables was analyzed in the study. The variables were factor analyzed a t each level of testing and the three sets of factor scores were canonically correlated. In general, more common factors were obtained at the lower levels and a more general Verbal factor was determined at the third grade level. The battery test-retest reliability was -86.