Abstract An expression is derived for the variances and covariances of the logarithms of origin- destination flows when estimated by one of a family of log-linear models. Among this family is the Furness growth factor model, the gravity model, the Willumsen model and the Van Zuylen-Bell model. Variances and covariances for the logarithms of the parameters incorporating prior information and for the values of the constraints with which the fitted values must conform are transformed linearly into approximate variances and covariances for the logarithms of the fitted values. Additional error due to misspecification of either the model or the constraints is not taken into account. Depending on the model, the prior information parameters may correspond to values of a deterrence function or to a base year trip matrix, while the constraints may represent design year trip end totals or traffic counts. As an illustration, the expression is applied to an example involving Willumsen's model.


    Zugriff

    Zugriff prüfen

    Verfügbarkeit in meiner Bibliothek prüfen

    Bestellung bei Subito €


    Exportieren, teilen und zitieren



    Titel :

    Variances and covariances for origin-destination flows when estimated by log-linear models


    Beteiligte:
    Bell, M.G.H. (Autor:in)

    Erschienen in:

    Erscheinungsdatum :

    1985-01-01


    Format / Umfang :

    11 pages




    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Elektronische Ressource


    Sprache :

    Englisch



    Correlations, variances, covariances - from GOCE signals to GOCE products

    Schuh, W.-D. / Boxhammer, C. / Siemes, C. | British Library Conference Proceedings | 2007


    Origin-Destination Matrices Estimated with a Genetic Algorithm from Link Traffic Counts

    Kim, Hyunmyung / Baek, Seungkirl / Lim, Yongtaek | Transportation Research Record | 2001


    Origin-Destination Matrices Estimated with a Genetic Algorithm from Link Traffic Counts

    Kim, H. / Baek, S. / Lim, Y. et al. | British Library Conference Proceedings | 2001