Abstract
Possible bias in the differential predictive validity of the Kaufman Assessment Battery (K-ABC) was investigated with 76 Anglo and 90 Mexican American fifth- and sixth-grade boys and girls. All children were English-speaking and from similar socioeconomic backgrounds. The criterion variable was the Comprehensive Tests of Basic Skills (CTBS; Language, Reading, Mathematics, and Total Scores). Several statistical techniques were used to investigate test bias (examination of predictive validity coefficients; two methods of examining homogeneity of slopes of the regression lines). The results showed considerable evidence of bias in differential predictive validity, indicating that the global cognitive score of the K-ABC (the Mental Processing Composite) was less effective in predicting CTBS scores for the Mexican American group than for the Anglo group.
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