Evaluation of the Adult Strabismus-20 (AS-20) questionnaire using Rasch analysis.


PURPOSE To further refine the Adult Strabismus 20 (AS-20) health-related quality of life (HRQOL) questionnaire using Rasch analysis. METHODS Rasch analysis was performed independently on the original AS-20 using the following steps: dimensionality, response ordering, local dependence, infit and outfit analyses, differential item functioning, subject… (More)
DOI: 10.1167/iovs.11-8308

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