Predictive bias was examined using data obtained from ethnically diverse referred and nonreferred samples. Achievement and intelligence measures included the Wechsler Intelligence Scale-Revised, Kaufman Achievement Battery, Woodcock-Johnson Psychoeducational Battery and the Woodcock Language Proficiency Battery. The sample consisted of 236 subjects selected from a large urban district in Texas. Results revealed evidence of predictive bias in several sets of intelligence-achievement measures. For the most part, intercept bias was more evident than slope bias (differential validity). The need for test developers to assess predictive bias in new or revised tests is emphasized.
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