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Direct linkHallahan, Daniel P.; Keller, Clayton E.; Martinez, Elizabeth A.; Byrd, E. Stephen; Gelman, Jennifer A.; Fan, Xitao – Exceptional Children, 2007
This study compared interstate variability of prevalence rates for special education categories from 1984 to 1985 through 2001 to 2002, using the coefficient of variation (CV), which is designed to compare variances when the means of the groups compared are radically different. The category of learning disabilities, presumed by many to be the most…
Descriptors: Learning Disabilities, Hearing Impairments, Language Impairments, Speech Impairments
