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Wei, Xin; Christiano, Elizabeth R.A.; Yu, Jennifer W.; Wagner, Mary; Spiker, Donna – Grantee Submission, 2015
This study examined the reading and math achievement profiles and longitudinal growth trajectories of a nationally representative sample of children ages 6 through 9 with an ASD. Four distinct achievement profiles were identified: higher-achieving (39%), hyperlexia (9%), hypercalculia (20%), and lower-achieving (32%). Children with hypercalculia…
Descriptors: Autism, Cognitive Ability, Hierarchical Linear Modeling, High Achievement
Cho, Sun-Joo; Cohen, Allan S.; Bottge, Brian – Grantee Submission, 2013
A multilevel latent transition analysis (LTA) with a mixture IRT measurement model (MixIRTM) is described for investigating the effectiveness of an intervention. The addition of a MixIRTM to the multilevel LTA permits consideration of both potential heterogeneity in students' response to instructional intervention as well as a methodology for…
Descriptors: Intervention, Item Response Theory, Statistical Analysis, Models