Application of the Rasch Rating Scale Model to the Assessment of Quality of Life of Persons with Intellectual Disability

Autor/inn/en	Gomez, Laura E.; Arias, Benito; Verdugo, Miguel Angel; Navas, Patricia
Titel	Application of the Rasch Rating Scale Model to the Assessment of Quality of Life of Persons with Intellectual Disability
Quelle	In: Journal of Intellectual & Developmental Disability, 37 (2012) 2, S.141-150 (10 Seiten)Infoseite zur Zeitschrift PDF als Volltext Verfügbarkeit
Sprache	englisch
Dokumenttyp	gedruckt; online; Zeitschriftenaufsatz
ISSN	1366-8250
DOI	10.3109/13668250.2012.682647
Schlagwörter	Evidence; Models; Mental Retardation; Quality of Life; Rating Scales; Psychometrics; Test Theory; Program Validation; Item Analysis; Item Response Theory; Adults; Foreign Countries; Test Reliability; Test Validity; Spain + Suchen Sie Ihr Suchwort? Evidenz; Analogiemodell; Geistige Behinderung; Lebensqualität; Rating-Skala; Psychometry; Psychometrie; Testtheorie; Itemanalyse; Item-Response-Theorie; Ausland; Testreliabilität; Testvalidität; Spanien
Abstract	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 Quality of Life Scale (i.e., fit statistics, person and item reliability coefficients) with RSM. Method: The sample comprised 271 Spanish adults with intellectual disability. Results: The results showed that the data fitted the model, point-biserial correlations were adequate, items showed precision, reliability of items (0.98) and persons (0.89) were adequate, and the response categories were suitable (thresholds were ordered). However, one item ("I feel excluded from society") did not fit the model and a few items were too easy for participants to achieve. Conclusions: Although it seems necessary to include more difficult items and to delete one, the INTEGRAL Scale is a useful instrument with evidence of validity. (Contains 3 figures.) (As Provided).
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Erfasst von	ERIC (Education Resources Information Center), Washington, DC
Update	2017/4/10