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Item response theory detected differential item functioning between healthy and ill children in quality-of-life measures
Langer, MM., Hill, CD., Thissen, D., Burwinkle, TM., Varni, JW., & Dewalt, DA. (2008). Item response theory detected differential item functioning between healthy and ill children in quality-of-life measures. Journal of Clinical Epidemiology, 61(3), 268-276.
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