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Direct linkPeterson, Robin L.; McGrath, Lauren M.; Willcutt, Erik G.; Keenan, Janice M.; Olson, Richard K.; Pennington, Bruce F. – Journal of Learning Disabilities, 2021
Despite historical emphasis on "specific" learning disabilities (SLDs), academic skills are strongly correlated across the curriculum. Thus, one can ask how specific SLDs truly are. To answer this question, we used bifactor models to identify variance shared across academic domains (academic "g"), as well as variance unique to…
Descriptors: Learning Disabilities, Elementary School Students, Secondary School Students, Clinical Diagnosis
Robertson, Gary; And Others – 1989
A study was conducted to refine the writing scale incorporated into the Peabody Individual Achievement Test-Revised. The test uses a single scale for judging writing samples from students in grades 2 through 12. It was questioned whether a single, relatively brief rating scale could have the sensitivity required to discriminate among the range of…
Descriptors: Elementary School Students, Elementary Secondary Education, Interrater Reliability, Latent Trait Theory
