In a number of semiparametric models, smoothing seems necessary in order to obtain estimates of the parametric component which are asymptotically normal and converge at parametric rate. However, smoothing can inflate the error in the normal approximation, so that refined approximations are of...

This paper presents an approach to measuring the values of time cost for freight transportation, and examines its applicability through empirical analysis. We develop the method based on the hedonic approach by explicitly formulating how transport time is determined as market outcome. In the...