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Occurrences and sources of Differential Item Functioning (DIF) in patient-reported outcome measures: Description of DIF methods,and review of measures of depression,quality of life and general health
Differential Item Functioning (DIF) measurement equivalence patient-reported outcomes
2009/12/18
Examination of the equivalence of measures involves several levels, including conceptual equivalence of meaning, as well as quantitative tests of differential item functioning (DIF). The purpose of th...