Sometimes numerical failure of an econometric software package is quite stark: a nonlinear procedure fails to converge; illegal arguments to a function cause an abnormal end; matrices cannot be inverted. Other times a package fails without warning, and these types of failures are particularly...

This essay examines the role of data and program-code archives in making economic research 'replicable.' Replication of published results is recognized as an essential part of the scientific method. Yet, historically, both the 'demand for' and 'supply of' replicable results in economics has been...

This paper proposes a dynamic version of the principle of ranking and selection of projects by their benefit cost ratios (BCRs). It permits a very simple and practical technique for adaptive sequential choice to provide incentives for self help, cost control, sharing and maintenance. We discuss...

The model in this paper is intended to explain the choice of transport made by shippers, as well as their total demand for transportation services. The optimal choice of mode is shown to involve a trade-off among freight rates, speed, dependability (variance in speed) and en-route lossage. It is...