Hernández-Alava, Mónica; Pudney, Stephen (2016). Bicop: A Command for Fitting Bivariate Ordinal Regressions with Residual Dependence Characterized by a Copula Function and Normal Mixture Marginals. The Stata Journal: Promoting communications on statistics and Stata, 16(1), 159–184.
doi:10.1177/1536867x1601600114
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