Local Transport Today is the authoritative, independent journal for transport decision makers. Analysis, Comment & News on Transport Policy, Planning, Finance and Delivery since 1989.

Validation: more to it than meets the eye

For readers not already intimately acquainted with the complexities of model validation, Faiz Nassiri, director of transport modelling at Colin Buchanan, provides a guide to the basics

Faiz Nassiri, Colin Buchanan’s director of transport modelling
Faiz Nassiri, Colin Buchanan’s director of transport modelling


Model calibration is the process of adjusting and confirming values of various parameters in the base model by making use of observed data and model validation is the assessment of the validity of a calibrated model by comparing the results of the model output against journey times and independent counts not used in the calibration.

GEH is a statistical value used to compare observed and modelled flows. It incorporates both relative and absolute differences between the two sets of data and...

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