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    Valuation of travel time savings in WTP and preference space in the presence of taste and scale heterogeneity

    Access Status
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    Authors
    Hensher, D.
    Greene, William
    Date
    2011
    Type
    Journal Article
    
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    Citation
    Hensher, D. and Greene, W. 2011. Valuation of travel time savings in WTP and preference space in the presence of taste and scale heterogeneity. Journal of Transport Economics and Policy. 45 (3): pp. 505-525.
    Source Title
    Journal of Transport Economics and Policy
    ISSN
    0022-5258
    School
    School of Economics and Finance
    URI
    http://hdl.handle.net/20.500.11937/9999
    Collection
    • Curtin Research Publications
    Abstract

    A major concern with the derivation of willingness to pay (WTP) distributions from mixed logit models is the incidence of values over a range that are deemed 'behaviourally questionable', with respect to the sign and magnitude. Recent research in redefining the 'space' within which a choice model is estimated as WTP space, instead of preference-space, has offered encouraging evidence in reducing the range of behavioural implausibility. This paper develops models to compare the empirical evidence when a mixed logit model is estimated with unconstrained distributions on random parameters in WTP and preference space, taking into account scale and the correlation between the attributes. The findings suggest that the gap between the evidence in WTP and preference space narrows significantly when both scale and preference heterogeneity are identified.

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