Rubin (1987) has proposed multiple imputations as a general method for estimation ion the presence of missing data. Rubin's results only strictly apply to Bayesian models, but Schenker and Welsh (1988) directly prove the consistency of multiple imputations inferences when there are missing...

"Congestion generates travel delays and other unobservable but palpable costs, such as stress and frustration. This paper exploits a unique empirical setting to estimate these unobservable costs and the externalities that they imply. Results suggest that the size of these externalities is...

This paper investigates the impact of residential density on household vehicle usage and fuel consumption. We estimate a simultaneous equations system to account for the potential residential self-selection problem. While most previous studies focus on a specific region, this paper uses national...