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KMID : 1001720160260020081
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Journal of Vocational Rehabilitation
2016 Volume.26 No. 2 p.81 ~ p.97
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Rating Scale Optimization of the Assistive Technology Device Satisfaction Scale for People with Physical Disabilities
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Yang Hyun-Kieu
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Abstract
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The purpose of this study was to optimize the rating scale of the assistive technology device satisfaction scale for people with physical disabilities. The raw data to be analyzed was obtained from the 2013 survey for satisfaction of assistive technology service, which was conducted by Korea Employment Agency for the Disabled(KEAD). The assistive technology device satisfaction data for 171 people with physical disabilities were extracted from the raw data and used to verify how well 5-point rating scale fits the Rasch rating scale model. Based on the results, the new structures of categories were searched by collapsing rating scale categories, which are likely to provide the most meaningful information and improve the quality of measurement taking place with the data. And then Rasch measurement analyses were performed to find the new structure of categories which best optimizes the use of the rating scale. The results of these analyses were as follows. First, it was found that the original 5-point scale was not acceptable with some fit problems. Second, the 4-point scale with categories 1 and 2 collapsed was considered optimal for people with physical disabilities. Based on the results, the future directions of the researches on the rating scale optimization were suggested.
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KEYWORD
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people with physical disabilities, assistive technology device satisfaction scale, rating scale optimization, Rasch rating scale model
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