OPARALLEL: Stata module providing post-estimation command for testing the parallel regression assumption. oparallel is a post-estimation command testing the parallel regression assumption in a ordered logit model. By default it performs five tests: a likelihood ratio test, a score test, a Wald test, a Wolfe-Gould test, and a Brant test. These tests compare a ordered logit model with the fully generalized ordered logit model, which relaxes the parallel regression assumption on all explanatory variables. Optionally, oparallel can use the bootstrap to compute the p-values for these tests.

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  1. Fullerton, Andrew S.; Xu, Jun: Ordered regression models. Parallel, partial, and non-parallel alternatives (2016)