An Introduction to Generalised Functional Form and Random Coefficients in Transport Modelling

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Abstract
There are two developments in statistical methodology which have been examined extensively in the econometrics and statistics literature but have not been applied to a great extent in transportation research. These are the use of generalised functional form in regression problems, and random-coefficient techniques. The purposes of this paper are to present a brief survey of these areas, to examine the uses of these techniques on transport-related topics, and to suggest further applications of the procedures to transport. The exposition of these areas includes more intuitive than technical derivation, in order to make the paper as accessible as possible.