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ERIC Number: EJ964992
Record Type: Journal
Publication Date: 2012-Jun
Pages: 10
Abstractor: As Provided
ISSN: ISSN-1366-8250
Application of the Rasch Rating Scale Model to the Assessment of Quality of Life of Persons with Intellectual Disability
Gomez, Laura E.; Arias, Benito; Verdugo, Miguel Angel; Navas, Patricia
Journal of Intellectual & Developmental Disability, v37 n2 p141-150 Jun 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 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.)
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Publication Type: Journal Articles; Reports - Research
Education Level: Adult Education
Audience: N/A
Language: English
Sponsor: N/A
Authoring Institution: N/A
Identifiers - Location: Spain