Estimation of value of travel-time savings using mixed logit models
In this paper, we discuss some of the issues that arise with the computation of the implied value of travel-time savings in the case of discrete choice models allowing for random taste heterogeneity. We specifically look at the case of models producing a non-zero probability of positive travel-time coefficients, and discuss the consistency of such estimates with theories of rational economic behaviour. We then describe how the presence of unobserved travel-experience attributes or conjoint activities can bias the estimation of the travel-time coefficient, and can lead to false conclusions with regards to the existence of negative valuations of travel-time savings. We note that while it is important not to interpret such estimates as travel-time coefficients per se, it is nevertheless similarly important to allow such effects to manifest themselves; as such, the use of distributions with fixed bounds is inappropriate. On the other hand, the use of unbounded distributions can lead to further problems, as their shape (especially in the case of symmetrical distributions) can falsely imply the presence of positive estimates. We note that a preferable solution is to use bounded distributions where the bounds are estimated from the data during model calibration. This allows for the effects of data impurities or model misspecifications to manifest themselves, while reducing the risk of bias as a result of the shape of the distribution. To conclude, a brief application is conducted to support the theoretical claims made in the paper.
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Volume (Year): 39 (2005)
Issue (Month): 2-3 ()
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Please report citation or reference errors to , or , if you are the registered author of the cited work, log in to your RePEc Author Service profile, click on "citations" and make appropriate adjustments.:
- Mokhtarian, Patricia L & Salomon, Ilan, 2001.
"How Derived is the Demand for Travel? Some Conceptual and Measurement Considerations,"
University of California Transportation Center, Working Papers
qt7cx951n5, University of California Transportation Center.
- Mokhtarian, Patricia L. & Salomon, Ilan, 2001. "How derived is the demand for travel? Some conceptual and measurement considerations," Transportation Research Part A: Policy and Practice, Elsevier, vol. 35(8), pages 695-719, September.
- Mokhtarian, Patricia & Salomon, Ilan, 2001. "How Derived is the Demand for Travel? Some Conceptual and Measurement Considerations," Institute of Transportation Studies, Working Paper Series qt1z26n1r8, Institute of Transportation Studies, UC Davis.
- Evans, Alan W, 1972. "On the Theory of the Valuation and Allocation of Time," Scottish Journal of Political Economy, Scottish Economic Society, vol. 19(1), pages 1-17, February.
- Lothlorien Redmond & Patricia Mokhtarian, 2001.
"The positive utility of the commute: modeling ideal commute time and relative desired commute amount,"
Springer, vol. 28(2), pages 179-205, May.
- Redmond, Lothlorien S. & Mokhtarian, Patricia L., 2001. "The Positive Utility of the Commute: Modeling Ideal Commute Time and Relative Desired Commute Amount," University of California Transportation Center, Working Papers qt4mc291p2, University of California Transportation Center.
- Algers, Staffan & Bergström, Pål & Dahlberg, Matz & Lindqvist Dillén, Johanna, 1998.
"Mixed Logit Estimation of the Value of Travel Time,"
Working Paper Series
1998:15, Uppsala University, Department of Economics.
- Algers, S. & Bergstrom, P. & Dahlberg, M. & Dillen, J.L., 1998. "Mixed Logit Estimation of the Value of Travel Time," Papers 1998:15, Uppsala - Working Paper Series.
- Mokhtarian, Patricia L & Salomon, Ilan, 1998.
"What Happens When Mobility-Inclined Market Segments Face Accessibility-Enhancing Policies?,"
University of California Transportation Center, Working Papers
qt9ns6v74t, University of California Transportation Center.
- Solomon, Ilan & Mokhtarian, Patricia L., 1998. "What Happens When Mobility-Inclined Market Segments Face Accessibility-Enhancing Policies?," University of California Transportation Center, Working Papers qt0f20d772, University of California Transportation Center.
- Salomon, Ilan & Mokhtarian, Patricia, 1998. "What Happens When Mobility-Inclined Market Segments Face Accessibility-Enhancing Policies?," Institute of Transportation Studies, Working Paper Series qt2x75525j, Institute of Transportation Studies, UC Davis.
- David Hensher, 2001. "The valuation of commuter travel time savings for car drivers: evaluating alternative model specifications," Transportation, Springer, vol. 28(2), pages 101-118, May.
- Daniel McFadden & Kenneth Train, 2000. "Mixed MNL models for discrete response," Journal of Applied Econometrics, John Wiley & Sons, Ltd., vol. 15(5), pages 447-470.
- Bates, John J, 1987. "Measuring Travel Time Values with a Discrete Choice Model: A Note," Economic Journal, Royal Economic Society, vol. 97(386), pages 493-98, June.
- Sergio Jara-Díaz, 2003. "On the goods-activities technical relations in the time allocation theory," Transportation, Springer, vol. 30(3), pages 245-260, August.
- David Hensher & William Greene, 2003. "The Mixed Logit model: The state of practice," Transportation, Springer, vol. 30(2), pages 133-176, May.
- Kenneth Train, 2003. "Discrete Choice Methods with Simulation," Online economics textbooks, SUNY-Oswego, Department of Economics, number emetr2, March.
- David A. Hensher, 2001. "Measurement of the Valuation of Travel Time Savings," Journal of Transport Economics and Policy, London School of Economics and University of Bath, vol. 35(1), pages 71-98, January.
- Patricio E. Pérez & Francisco J. Martínez & Juan de Dios Ort�zar, 2003. "Microeconomic Formulation and Estimation of a Residential Location Choice Model: Implications for the Value of Time," Journal of Regional Science, Wiley Blackwell, vol. 43(4), pages 771-789.
- Bhat, Chandra R., 1998. "Accommodating variations in responsiveness to level-of-service measures in travel mode choice modeling," Transportation Research Part A: Policy and Practice, Elsevier, vol. 32(7), pages 495-507, September.
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