Frailty models have emerged as a pivotal tool in survival analysis, offering a robust framework to account for unobserved heterogeneity and dependence between paired failure times. In bivariate ...

This is a preview. Log in through your library . Abstract As tour-based methods for activity and travel participation patterns replace trip-based methods, time-of-day (TOD) choice modeling remains ...

This is a preview. Log in through your library . Abstract I consider an ordered probit model in which some of the observations in one of the categories are missing. The model can be estimated because ...