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Direct linkFacon, Bruno; Courbois, Yannick; Magis, David – Journal of Intellectual & Developmental Disability, 2016
Background: In this work we sought to expand our knowledge of developmental trajectories of subcomponents of the language systems of individuals with intellectual disability (ID). We aimed to explore how "general" and "relational" vocabularies evolve as a function of cognitive level. Method: Developmental trajectories of…
Descriptors: Vocabulary Development, Comprehension, Children, Adolescents
Facon, Bruno; Magis, David; Courbois, Yannick – Research in Developmental Disabilities: A Multidisciplinary Journal, 2012
The aim of the study was to compare the difficulty of relational concepts among participants with and without intellectual disability. The French versions of the Boehm Tests of Basic Concepts Third Edition (Preschool and Kindergarten to 2nd grade) were administered to three groups of 47 participants individually matched on their total raw score on…
Descriptors: Down Syndrome, Children, Test Items, Difficulty Level
Magis, David; Facon, Bruno – Educational and Psychological Measurement, 2013
Item purification is an iterative process that is often advocated as improving the identification of items affected by differential item functioning (DIF). With test-score-based DIF detection methods, item purification iteratively removes the items currently flagged as DIF from the test scores to get purified sets of items, unaffected by DIF. The…
Descriptors: Test Bias, Test Items, Statistical Analysis, Error of Measurement
