The Woodcock-Johnson IV Tests of Achievement Provides Too Many Scores for Clinical Interpretation

Stefan C. Dombrowski, , Ryan J. McGill & Nicholas F. Benson
The Woodcock-Johnson Tests of Achievement, Fourth Edition (WJ IV ACH) is purported to align with Cattell–Horn–Carroll (CHC) theory and offers upward of 20 scores within its interpretive and scoring system. The Technical Manual does not furnish validity evidence for the scores reported by the scoring system, suggesting that evidentiary support may be incomplete. Exploratory bifactor analysis (EBFA; maximum likelihood extraction with a bigeomin [orthogonal] rotation) was applied to the two school-aged correlation matrices at ages...
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