Bayesian Unit Root Test for Model with Maintained Trend // Performs Bayesian unit root testing for time series models with maintained polynomial trend components as proposed by Chaturvedi and Kumar (2005) doi:10.1016/j.spl.2005.04.044. The package 'BayesURTrend' computes posterior odds ratios, Bayes factors, and posterior probabilities for unit root hypotheses against stationary alternatives in autoregressive models augmented with polynomial trends. Methodological foundations for Bayesian unit root testing under structural breaks and maintained trends are drawn from Schotman and van Dijk (1991) doi:10.1016/0304-4076(91)90038-F, Phillips and Perron (1988) doi:10.1093/biomet/75.2.335, and Ouliaris et al. (1988) doi:10.1007/978-94-009-2953-1_10.