On the robustness of RRM modelling outcomes towards omitted attributes

van Cranenburgh, Sander and Prato, Carlo G. (2016) On the robustness of RRM modelling outcomes towards omitted attributes. Journal of Choice Modelling, 18 51-70. doi:10.1016/j.jocm.2016.04.004

Author van Cranenburgh, Sander
Prato, Carlo G.
Title On the robustness of RRM modelling outcomes towards omitted attributes
Journal name Journal of Choice Modelling   Check publisher's open access policy
ISSN 1755-5345
Publication date 2016-03-01
Sub-type Article (original research)
DOI 10.1016/j.jocm.2016.04.004
Open Access Status Not Open Access
Volume 18
Start page 51
End page 70
Total pages 20
Place of publication London, United Kingdom
Publisher Elsevier
Language eng
Formatted abstract
As discrete choice models may be misspecified, it is crucial for choice modellers to have knowledge on the robustness of their modelling outcomes towards misspecification. This study investigates the robustness of Random Regret Minimization (RRM) modelling outcomes towards one sort of model misspecification: the omission of relevant attributes. We explore the effect of omitted attributes (orthogonal and correlated) in the context of labelled and unlabeled data. In the context of labelled data, we show that – just as in RUM models – in RRM models Alternative Specific Constants (ASCs) can be used to capture the average effect of omitted attributes. However, in contrast to RUM models, ASCs in RRM models are choice set composition specific. This implies that in order to achieve consistent parameter estimates when the choice set composition varies across choice observations, different sets of ASCs need to be estimated for each unique choice set composition. In the context of unlabeled data, we show – using Monte Carlo simulations – that RRM models are fairly robust towards the presence of an orthogonal omitted attribute, though not as robust as the linear-additive RUM model. Specifically, we find that: (1) Aggregate Demand Elasticities (ADEs) implied by RRM models are less robust towards the presence of an orthogonal omitted attributes than those implied by linear-additive RUM models, and (2) Average Sample Effects (ASEs) implied by RRM models are – in the presence of an omitted orthogonal attribute – more sensitive towards misspecification in terms of the underlying decision rule than those implied by its linear-additive RUM counterpart.
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Civil Engineering Publications
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Created: Tue, 24 May 2016, 23:38:14 EST by Carlo Prato on behalf of School of Civil Engineering