Potthoff bias analyses of K-ABC MPC and Nonverbal Scale IQs among Anglo, Black, and Puerto Rican kindergarten children.

Bias analyses, via R. F. Potthoff's (1966) regression technique, were conducted to investigate the predictive utility of Kaufman Assessment Battery for Children (K-ABC) Mental Processing Composite (MPC) and Nonverbal scale IQs using 65 Anglo, 24 Black, 27 English-dominant Puerto Rican, and 30 Spanish-dominant Puerto Rican kindergarten children (aged 5 yrs through 5 yrs 11 mo) on 4 achievement criteria. Nonverbal scale IQs were poor predictors for English-dominant Puerto Rican Ss. MPC slope and intercept differences underestimated low-scoring Blacks on the teacher-assigned-grades criterion. When significant differences were found during other comparisons, results consistently showed that K-ABC IQs overestimated achievement for the minority Ss. (PsycINFO Database Record (c) 2010 APA, all rights reserved)