Citation
Beretvas, S. N., Cawthon, S., Lockhart, L., & Kaye, A. (2012). Assessing impact, DIF and DFF in accommodated item scores: A comparison of multilevel measurement model parameterizations. Educational and Psychological Measurement, 72(5), 754–773; first published online on April 24, 2012, as doi:10.1177/0013164412440998