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Parameter stability in freight generation and distribution demand models in colombia

HOLGUÍN-VERAS, JOSE and SARMIENTO, IVÁN and GONZÁLEZ-CALDERÓN, CARLOS A. (2011) Parameter stability in freight generation and distribution demand models in colombia. Dyna; Vol. 78, núm. 166 (2011); 17-20 DYNA; Vol. 78, núm. 166 (2011); 17-20 2346-2183 0012-7353 .

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URL oficial: http://revistas.unal.edu.co/index.php/dyna/article...

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This paper conducts an empirical investigation on the temporal stability of parameters of freight demand models in the short-medium term. The analyses are based on seven national freight origin-destination samples conducted by the Colombian government during the years 1999 to 2005. The paper studies the stability of the parameters of freight generation and freight distribution. Typical formulations of these models were calibrated using the cross-sectional data corresponding to each year. Then, to identify time-dependent effects, the resulting parameters were regressed as a function of a time index. The results indicate the presence of statistically significant time-dependent effects on all freight generation models (production and attraction), as well as on the freight distribution model estimated with loaded vehicle trips. In contrast, the parameters of the freight distribution models based on commodity flows were found to be stable overtime.

Tipo de documento:Artículo - Article
Información adicional:Derechos de autor reservados
Palabras clave:freight generation models, freight distribution models
Unidad administrativa:Revistas electrónicas UN > Dyna
Código ID:27816
Enviado por : Dirección Nacional de Bibliotecas STECNICO
Enviado el día :27 Junio 2014 19:01
Ultima modificación:27 Noviembre 2017 22:21
Ultima modificación:27 Noviembre 2017 22:21
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