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Kaat, Aaron J.; Lecavalier, Luc; Aman, Michael G. – Journal of Autism and Developmental Disorders, 2014
The Aberrant Behavior Checklist (ABC) is a widely used measure in autism spectrum disorder (ASD) treatment studies. We conducted confirmatory and exploratory factor analyses of the ABC in 1,893 children evaluated as part of the Autism Treatment Network. The root mean square error of approximation was .086 for the standard item assignment, and in…
Descriptors: Validity, Children, Autism, Pervasive Developmental Disorders
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Onwuegbuzie, Anthony J.; Levin, Joel R.; Ferron, John M. – Journal of Experimental Education, 2011
Building on previous arguments for why educational researchers should not provide effect-size estimates in the face of statistically nonsignificant outcomes (Robinson & Levin, 1997), Onwuegbuzie and Levin (2005) proposed a 3-step statistical approach for assessing group differences when multiple outcome measures are individually analyzed…
Descriptors: Hypothesis Testing, Statistical Analysis, Effect Size, Probability