Penfield, Randall D. “Applying the Breslow-Day Test of Trend in Odds Ratio Heterogeneity to the Analysis of Nonuniform DIF”. Alberta Journal of Educational Research 49, no. 3 (October 1, 2003). Accessed July 17, 2024. https://journalhosting.ucalgary.ca/index.php/ajer/article/view/54981.