This paper shows how to cope with a problem of model selection and simplification using the principle of coherence (Gabriel (1969): A procedure involving testing a set of models ought not accept a model while rejecting a more general model). The mathematical lattice theory is used to define a...

The paper presents an analysis of the income elasticity of the value of travel time savings (VTTS). It expands on previous micro-econometric estimates of the VTTS on binary choice experimental data by accounting for income taxes, for the dependence of trip length on income and for the stochastic...

The distribution of the value of travel time savings (VTTS) is investigated employing various nonparametric techniques on a large, high quality data set. When background variables are not included in the model it is found that the right 13% tail of the distribution is not observed and hence the...

Although semiparametric alternatives are available, parametric binary choice models are widely used in practice, in spite of their sensitivity to misspecification. Here we present the results of a simulation study on the finite sample performance of parametric and semiparametric specification...

One of the key determinants of China's ability to continue its economic growth into the 21stcentury and to distribute the benefits of that growth to a broad spectrum of the population will be the further development of its railroad system. This paper examines the possibilities for improving the...

A variety of proposals for creating more competition within the railroad sector and in the broader freight transport sector are under consideration in countries throughout the world. Brazil, though something of a latecomer to wider infrastructure reform, has recently taken large steps in...