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Objective:
Test if differential item functioning due to gender, age, race/ethnicity, or education impacts Unified Dyskinesia Rating Scale scores.
Background:
Testing rating scales for differential item functioning is a core validation step. If differential item functioning exists, interpretation of item scores must consider secondary influences on dyskinesia ratings.
Methods:
Using Unified Dyskinesia...
Objective
Assess MDS‐UPDRS items for gender‐, age‐, and race/ethnicity‐based differential item functioning.
Background
Assessing differential item functioning is a core rating scale validation step. For the MDS‐UPDRS, differential item functioning occurs if item‐score probability among people with similar levels of parkinsonism differ according to selected covariates (gender, age, race/ethnicity)...
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