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Tolar, Tammy D.; Fuchs, Lynn; Fletcher, Jack M.; Fuchs, Douglas; Hamlett, Carol L. – Journal of Learning Disabilities, 2016
Three cohorts of third-grade students (N = 813) were evaluated on achievement, cognitive abilities, and behavioral attention according to contrasting research traditions in defining math learning disability (LD) status: low achievement versus extremely low achievement and IQ-achievement discrepant versus strictly low-achieving LD. We use methods…
Descriptors: Grade 3, Elementary School Students, Mathematics Instruction, Learning Disabilities
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King, Wayne M.; Giess, Sally A.; Lombardino, Linda J. – International Journal of Language & Communication Disorders, 2007
Background: The marked degree of heterogeneity in persons with developmental dyslexia has motivated the investigation of possible subtypes. Attempts have proceeded both from theoretical models of reading and the application of unsupervised learning (clustering) methods. Previous cluster analyses of data obtained from persons with reading…
Descriptors: Statistical Analysis, Reading Difficulties, Models, Databases