A maximum entropy-least squares estimator for elastic origin-destination trip matrix estimation
Publikation: Beitrag in Fachzeitschrift › Forschungsartikel › Beigetragen › Begutachtung
Beitragende
Abstract
In transportation subnetwork-supernetwork analysis, it is well known that the origin-destination (O-D) flow table of a subnetwork is not only determined by trip generation and distribution, but also a result from traffic routing and diversion, due to the existence of internal-external, external-internal and external-external flows. This result indicates the variable nature of subnetwork O-D flows. This paper discusses an elastic O-D flow table estimation problem for subnetwork analysis. The underlying assumption is that each cell of the subnetwork O-D flow table contains an elastic demand function rather than a fixed demand rate and the demand function can capture all traffic diversion effect under various network changes. We propose a combined maximum entropy-least squares estimator, by which O-D flows are distributed over the subnetwork in terms of the maximum entropy principle, while demand function parameters are estimated for achieving the least sum of squared estimation errors. While the estimator is powered by the classic convex combination algorithm, computational difficulties emerge within the algorithm implementation until we incorporate partial optimality conditions and a column generation procedure into the algorithmic framework. Numerical results from applying the combined estimator to a couple of subnetwork examples show that an elastic O-D flow table, when used as input for subnetwork flow evaluations, reflects network flow changes significantly better than its fixed counterpart.
Details
Originalsprache | Englisch |
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Seiten (von - bis) | 1465-1482 |
Seitenumfang | 18 |
Fachzeitschrift | Transportation Research Part B: Methodological |
Jahrgang | 45 ` |
Ausgabenummer | 9 |
Publikationsstatus | Veröffentlicht - Nov. 2011 |
Peer-Review-Status | Ja |
Extern publiziert | Ja |
Externe IDs
ORCID | /0000-0002-2939-2090/work/141543800 |
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Schlagworte
ASJC Scopus Sachgebiete
Schlagwörter
- Convex combination, Elastic demand, Least squares, Maximum entropy, Origin-destination trip table, Subnetwork analysis