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Direct linkPeltier, Corey; Flores, Margaret M.; Strickland, Tricia K. – Learning Disability Quarterly, 2023
Single-case research design is a useful methodology for evaluating the presence of a functional relation between an intervention and the mathematical performance of students with a learning disability. However, a functional relation cannot be established with threats to internal validity of the design. External validity is impacted if researchers…
Descriptors: Research Design, Intervention, Mathematics Achievement, Students with Disabilities
Ciullo, Stephen; Falcomata, Terry; Vaughn, Sharon – Learning Disability Quarterly, 2015
The authors report the effects of a single-case, multiple-probe design investigation for students with learning disabilities (LD) in Grades 4 and 5. Seven students classified as LD and with persistent difficulty with informational-text comprehension from two elementary schools participated. The study compared social studies learning across two…
Descriptors: Learning Disabilities, Social Studies, Elementary School Students, Instructional Materials
Reed, Deborah K.; Vaughn, Sharon; Petscher, Yaacov – Learning Disability Quarterly, 2012
In this study, the authors examined the validity of a holistically scored retell within a confirmatory factor analysis framework by comparing the fit of a three-factor model of reading with the data from a diverse sample of seventh and eighth graders. The final model demonstrated adequate fit, [chi][squared](32) = 97.316; comparative fit index =…
Descriptors: Factor Analysis, Validity, Reading Comprehension, Grade 8
