Browsing by Author "ORTUZAR, JD"

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    DERIVING PUBLIC TRANSPORT LEVEL OF SERVICE WEIGHTS FROM A MULTIPLE COMPARISON OF LATENT AND OBSERVABLE VARIABLES
    (STOCKTON PRESS, 1994) GARRIDO, RA; ORTUZAR, JD
    Perceived importance attribute rankings, obtained from samples of various types of public transport users, are used to determine the relative weights of their level of service vectors. A generalization of a recent linear programming methodology is proposed which requires transforming the ranking data into equivalent pairwise choices. The weights were compared with those obtained from discrete choice models estimated with stated preference data.
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    FLEXIBLE LONG-RANGE PLANNING USING LOW-COST INFORMATION
    (1991) ORTUZAR, JD; WILLUMSEN, LG
    Contemporary transport planning requires a flexible modelling approach which can be used to monitor the implementation of a long term plan checking regularly its short term performance with easily available data; the original model is periodically updated using low cost information and this allows the evaluation of the changes to the plan which may be required. Such an approach requires models suited to regular updating and to the use of data from different sources. Models to update trip matrices from traffic counts have been available for some time; however, the estimation and/or updating of other model stages with low cost data has escaped analytical treatment. The paper discusses this idea and formulates the updating problem for an example involving a joint destination/mode choice model under various assumptions about the nature of the available data. Analytical solutions are proposed as well as some general conclusions.