Discussion Papers, Department of Business and Management Science, Norwegian School of Economics (NHH)
Jens Petter Gitlesen
Misspecifications due to aggregation of data in models for journeys-to-work
(), Inge Thorsen
() and Jan Ubøe
Abstract: In this paper we develop a new simulation procedure that
can be used to examine validity of model extensions. Our testing regime is
carried out on a number of different trip distribution models. We test the
models on synthetic populations contructed from an aggregated set of worker
categories, reflecting for instance different qualifications. The advantage
of this approach is that a large number of tests can be carried out
repeatedly. We then examine how specific attributes of spatial structure
and worker heterogeneity are captured by different modeling alternatives.
It is quite surpricing to see how some model formulations systematically
report significant contributions in cases where (by construction of the
data) no such effects are present. This illustrates the imminent risk of
drawing wrong conclusions in empirical work, i.e., that model extensions
based on behavioral principles can sometimes report significant
contributions that are in fact spurious.
Keywords: Simulation procedure; Model extensions; Trip distribution models; (follow links to similar papers)
JEL-Codes: C12; (follow links to similar papers)
21 pages, October 22, 2004
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