Higher order factor structure of the Luria interpretive scheme on the Kaufman Assessment Battery for Children-Second Edition (KABC-II) for the 7- to 12-year and the 13- to 18-year age groups in the KABC-II normative sample ( N = 2,025) is reported. Using exploratory factor analysis, multiple factor extraction criteria, and hierarchical exploratory factor analysis not included in the KABC-II manual, two-, three-, and four-factor extractions were analyzed to assess the hierarchical factor structure by sequentially partitioning variance appropriately to higher order and lower order dimensions as recommended by Carroll. No evidence for a four-factor solution was found. Results showed that the largest portions of total and common variance were accounted for by the second-order general factor and that interpretation should focus primarily, if not exclusively, at that level of measurement.

The current study examined the incremental validity of the Luria interpretive scheme for the Kaufman Assessment Battery for Children‐Second Edition (KABC‐II) for predicting scores on the Kaufman Test of Educational Achievement‐Second Edition (KTEA‐II). All participants were children and adolescents (N = 2,025) drawn from the nationally representative KABC‐II/KTEA‐II linked standardization sample. Consistent with previous studies, the full scale Mental Processing Index (MPI) score accounted for clinically significant portions of KTEA‐II score variance in all of the regression models that were assessed. In contrast, the Luria factor scores collectively failed to provide meaningful incremental predictive variance after controlling for the effects of the MPI. Individually, the factor scores consistently accounted for trivial portions of achievement variance. Potential implications of these results for the correct interpretation of the KABC‐II within clinical practice are discussed.

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