This function calculates the (natural logarithm of the) global odds ratio of pairs of items, which are dichotomized beforehand.
Numeric matrix of dimension N x J (for N persons and J items) containing the responses.
Vector of length 'J choose 2' odds ratios.
Li, T., Xie, C., & Jiao, H. (2017). Assessing fit of alternative unidimensional polytomous IRT models using posterior predictive model checking. Psychological Methods, 22, 397-408. doi:10.1037/met0000082
Zhu, X., & Stone, C. A. (2012). Bayesian comparison of alternative graded response models for performance assessment applications. Educational and Psychological Measurement, 72, 774-799. doi:10.1177/0013164411434638
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