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Gomez, Laura E.; Arias, Benito; Verdugo, Miguel Angel; Navas, Patricia – Journal of Intellectual & Developmental Disability, 2012
Background: Most instruments that assess quality of life have been validated by means of the classical test theory (CTT). However, CTT limitations have resulted in the development of alternative models, such as the Rasch rating scale model (RSM). The main goal of this paper is testing and improving the psychometric properties of the INTEGRAL…
Descriptors: Evidence, Models, Mental Retardation, Quality of Life