Making use of elicited confidence ratings of the SP survey in a joint RP-SP model: a case study of commuting mode choices for TDM evaluations

ABSTRACT

The paper proposes a joint econometric model to investigate the effects of inertia; elicited confidence rating on SP choices and socio-economic variables on the choice model parameter estimates. The proposed model is estimated empirically by using a dataset collected in the Region of Peel, Ontario, which was designed to collect data for evaluating employer-based Travel Demand Management (TDM) strategy evaluation. Empirical models reveal that the accommodation of inertia effects and socio-economic attributes in the joint RP-SP model mainly improves the goodness-of-fit of the choice model. However, capturing endogeneity between SP choice and elicited confidence rating improves the efficiency of parameter estimates by increasing the statistical significance of the choice model parameters. The paper shows that there is the profound benefit of collecting confidence rating information in SP choice experiment and exploiting such information to enhance choice model parameter estimates.

KEYWORDS:

• Stated Preference (SP)
• Reveal Preference (RP)
• Joint RP-SP
• elicited confidence rating
• endogeneity
• parameter estimation efficiency

Disclosure statement

No potential conflict of interest was reported by the authors.

Notes

1. We used an approximate marginal effect calculation procedure that considers an equivalent univariate confidence rating model. For the confidence rating of ‘R’ and a linear entropy function C_rj= θH_s the marginal effect of choice entropy H_s on corresponding confidence rating of ‘R’ is

Additional information

Funding

This work was supported by the University of Toronto and Regional Municipality of Peel.