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Remedial and Special Education
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Dyslexia Marker Variables

Reviving a System for Reporting Sample Characteristics in Learning Disabilities Research

Michael E. Spagna

MICHAEL E. SPAGNA, PhD, is an associate professor of special education at the California State University---Northridge. His research interests include the diagnosis and assessment of specific learning disabilities; the development, implementation, and evaluation of instructional/intervention techniques for students with mild/moderate disabilities; distance education models; and models for inclusive education. Address: Michael E. Spagna, Department of Special Education, California State University---Northridge, 18111 Nordhoff Street, Northridge, CA 91330.

Despite warnings that the field of learning disabilities (LD) must address the issue of population heterogeneity, the LD research community still lacks operational definitions of specific learning disabilities as well as a systematic approach for reporting sample characteristics. Recently, however, a definition of dyslexia has been proposed that might signal a significant advance. This article builds on this definition of dyslexia by: (a) reintroducing the concept of marker variables, (b) proposing a strategy for developing an updated marker variable system, (c) presenting a preliminary working set of dyslexia marker variables, and (d) calling for the eventual adoption of this or similar marker variable systems to facilitate future research efforts.

Remedial and Special Education, Vol. 19, No. 5, 291-299 (1998)
DOI: 10.1177/074193259801900505
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