The Transport Research Institute invites you to a seminar by
John Shrewsbury
"Calibrating Trip Distribution with Generalised Linear Models"
Friday 21st April 2006, 2.30pm to 3.30pm
Boardroom, Merchiston Campus, Napier University
Trip distribution is an important stage in transport models. It
determines the linkage between productions and attractions, establishing
the demand for transport arising from land uses.
Gravity models are in principle a straight forward form of trip
distribution model, but calibration of such models is complex.
Calibration can be achieved with Generalised Linear Models. This is an
advanced form of regression, available in most major statistical
packages. Complex distribution models can be fitted with a variety of
deterrence functions, weighted to allow for variations in sample rates.
The same form of log-linear model can be used for accident analysis.
Land Transport New Zealand has funded research into this method of
calibration at Canterbury University. The study has concentrated on
commuter car trip distribution, as the major purpose and mode, from a
2001 household travel survey of Wellington. The strategic transport
model built from this survey provides practical measures of the
different trip distributions, such as screenline crossing and scheme
usage and benefits.
John Shrewsbury will be presenting the results of this study to date,
sprinkled with speculations and some properties of trip distributions he
should have known before he started.
This is a technical topic. Statistics will be used, but not blindly -
half a dozen ways to be lead astray by them have been found. There is
even some entropy.
If you would like to attend the above seminar please email
[log in to unmask] <mailto:[log in to unmask]> or telephone 0131
455 3202
Debbie McEwan
PA to Director and TRi Administrator
Transport Research Institute
Napier University
Sighthill Campus
Edinburgh
EH11 4BN
Telephone: 0131 455 3200
Fax: 0131 455 3201
www.tri.napier.ac.uk <http://www.tri.napier.ac.uk>
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