Realism and Adaptation in Designing Hypothetical travel Choice Concepts
For external validity, SP experiments need to present choices that are realistic for the respondents. The use of portable computers in interviewing has many advantages.
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Modelling trip Frequency as a Poisson Variable
- T. Barmby J. Doornik
- September 1989
- Vol. 23
- No. 3
- Page 309
Modelling trip Frequency as a Poisson Variable
- T. Barmby J. Doornik
- September 1989
- Vol. 23
- No. 3
- Page 309
The Negative Binomial distribution, a generalisation of the Poisson distribution, is found to be useful in constructing a statistical model of trip frequency. It indicates that expenditure is a more important variable than the number of individuals in the household.
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