The Poisson model has been applied in the Netherlands as a submodel of the Apeldoorn Transportation Study for modelling shopping and personal business trips. The estimation results appear to be superior to the results of linear and non-linear regressions on the same data. The last section is devoted to the aggregation issue: An analytical aggregation procedure is proposed if the zonal variation of the l-parameter fits a gamma distribution.In the absence of knowledge of the distribution of, other aggregation procedures are discussed, of which the classification method seems most appropriate.
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