Interval estimation in the calibration of certain trip distribution models

David Giles and Peter Hampton

Transportation Research Part B: Methodological, 1981, vol. 15, issue 3, 203-219

Abstract: This paper argues for interval, rather than point, estimation when calibrating some variants of the trip distribution "gravity" models. Analytic expressions are derived for the approximate asymptotic covariances of least squares and maximum likelihood estimates of the parameters in the impedance function under a variety of conditions. A comparative numerical example, and an application using migration flows, are also presented.

Date: 1981
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