Capturing Correlation in Route Choice Models using Subnetworks
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1 Capturing Correlation in Route Choice Models using Subnetworks Emma Frejinger and Michel Bierlaire Transport and Mobility Laboratory (TRANSP-OR), EPFL Capturing Correlation with Subnetworks in Route Choice Models p.1/21
2 Outline Issues of route choice analysis Modelling correlation with subnetworks Methodology Example Empirical results Borlänge GPS dataset Estimation results Forecasting results Conclusion and future work Capturing Correlation with Subnetworks in Route Choice Models p.2/21
3 Route Choice Problem Given a transportation network composed of nodes, links, origin and destinations. For a given transportation mode and origin-destination pair, which is the chosen route? Issues: Universal choice set very large Correlated alternatives due to overlapping paths Data collection issues Capturing Correlation with Subnetworks in Route Choice Models p.3/21
4 Route Choice Modelling Deterministic utility maximisation e.g. shortest path assumption is behaviourally unrealistic Random utility models Utility U in an individual n associates with alternative i: U in = V in + ε in where V in = β T X in is the deterministic part and ε in is the random term Capturing Correlation with Subnetworks in Route Choice Models p.4/21
5 Route Choice Models Few models explicitly capturing correlation have been used on route choice problems of real size C-Logit (Cascetta et al., 1996) Path Size Logit (Ben-Akiva and Bierlaire, 1999) Link-Nested Logit (Vovsha and Bekhor, 1998) Logit Kernel model adapted to route choice situation (Bekhor et al., 2002) Probit model (Daganzo, 1977) permits an arbitrarily covariance structure specification but can rarely be applied in a real size route choice context Capturing Correlation with Subnetworks in Route Choice Models p.5/21
6 Subnetworks How can we explicitly capture the most important correlation structure without considerably increasing the model complexity? Capturing Correlation with Subnetworks in Route Choice Models p.6/21
7 Subnetworks How can we explicitly capture the most important correlation structure without considerably increasing the model complexity? Which are the behaviourally important decisions? Capturing Correlation with Subnetworks in Route Choice Models p.6/21
8 Subnetworks How can we explicitly capture the most important correlation structure without considerably increasing the model complexity? Which are the behaviourally important decisions? Our hypothesis: choice of specific parts of the network (e.g. main roads, city centre) Concept: subnetwork Capturing Correlation with Subnetworks in Route Choice Models p.6/21
9 Subnetworks Subnetwork approach designed to be behaviourally realistic and convenient for the analyst Subnetwork component is a set of links corresponding to a part of the network which can be easily labelled Paths sharing a subnetwork component are assumed to be correlated even if they are not physically overlapping Capturing Correlation with Subnetworks in Route Choice Models p.7/21
10 Subnetworks - Methodology Factor analytic specification of an error component model (based on model presented in Bekhor et al., 2002) U n = β T X n + F n Tζ n + ν n F n (JxQ) : factor loadings matrix (f n ) iq = l niq T (QxQ) = diag (σ 1,σ 2,...,σ Q ) ζ n (Qx1) : vector of i.i.d. N(0,1) variates ν (Jx1) : vector of i.i.d. Extreme Value distributed variates Capturing Correlation with Subnetworks in Route Choice Models p.8/21
11 Subnetworks - Example D S a O Path 3 Path 2 Path 1 S b Capturing Correlation with Subnetworks in Route Choice Models p.9/21
12 Subnetworks - Example U 1 = β T X 1 + p l 1a σ a ζ a + p l 1b σ b ζ b + ν 1 U 2 = β T X 2 + p l 2a σ a ζ a + ν 2 D U 3 = β T X 3 + p l 3b σ b ζ b + ν 3 S a O Path 3 Path 2 Path 1 S b FTT T F T = 2 l 1a σa 2 + l 1b σ 2 b l1a l2a σ 2 3 a l1b l3b σb l1a l2a σa 2 l 2a σa l3b l1b σb 2 0 l 3b σb 2 Capturing Correlation with Subnetworks in Route Choice Models p.10/21
13 Empirical Results The approach has been tested on three datasets: Boston (Ramming, 2001), Switzerland, and Borlänge Deterministic choice set generation Link elimination GPS data from 24 individuals 2978 observations, 2179 origin-destination pairs Borlänge network 3077 nodes and 7459 links BIOGEME (biogeme.epfl.ch, Bierlaire, 2003) has been used for all model estimations Capturing Correlation with Subnetworks in Route Choice Models p.11/21
14 Borlänge Road Network Capturing Correlation with Subnetworks in Route Choice Models p.12/21
15 Subnetwork Components R.50 S R.50 N R.70 S R.70 N R.C. Component length [m] Nb. of Observations Weighted Nb. of Observations (N q ) N q = o O l oq L q Capturing Correlation with Subnetworks in Route Choice Models p.13/21
16 Model Specifications Six different models: MNL, PSL, EC 1, EC 1, EC 2 and EC 2 EC 1 and EC 1 have a simplified correlation structure EC 1 and EC 2 do not include a Path Size attribute Deterministic part of the utility V i = β PS ln(ps i ) + β EstimatedTime EstimatedTime i + β NbSpeedBumps NbSpeedBumps i + β NbLeftTurns NbLeftTurns i + β AvgLinkLength AvgLinkLength i Capturing Correlation with Subnetworks in Route Choice Models p.14/21
17 Estimation Results Parameter estimates for explanatory variables are stable across the different models Path size parameter estimates Parameter PSL EC 1 EC 2 Path Size Scaled estimate Rob. T-test All covariance parameters estimates in the different models are significant except the one associated with R.50 S Capturing Correlation with Subnetworks in Route Choice Models p.15/21
18 Estimation Results Model Nb. σ Nb. Estimated Final Adjusted Estimates Parameters L-L Rho-Square MNL PSL EC 1 (with PS) EC EC 2 (with PS) EC pseudo-random draws for Maximum Simulated Likelihood estimation 2978 observations Null log likelihood: BIOGEME (biogeme.epfl.ch) has been used for all model estimations. Capturing Correlation with Subnetworks in Route Choice Models p.16/21
19 Forecasting Results Comparison of the different models in terms of their performance of predicting choice probabilities Five subsamples of the dataset Observations corresponding to 80% of the origin destination pairs (randomly chosen) are used for estimating the models The models are applied on the observations corresponding to the other 20% of the origin destination pairs Comparison of final log-likelihood values Capturing Correlation with Subnetworks in Route Choice Models p.17/21
20 Forecasting Results Same specification of deterministic utility function for all models Same interpretation of these models as for those estimated on the complete dataset Coefficient and covariance parameter values are stable across models Capturing Correlation with Subnetworks in Route Choice Models p.18/21
21 Forecasting Results Capturing Correlation with Subnetworks in Route Choice Models p.19/21
22 Conclusion Models based on subnetworks are designed for route choice modelling of realistic size Correlation on subnetwork is explicitly captured within a factor analytic specification of an Error Component model Estimation and prediction results clearly shows the superiority of the Error Component models compared to PSL and MNL Capturing Correlation with Subnetworks in Route Choice Models p.20/21
23 Conclusion The subnetwork approach is flexible and the trade-off between complexity and behavioural realism can be controlled by the analyst Paper to appear in Transportation Research Part B Future work Analysis of the sensitivity of the results regarding the definition of the subnetwork Influence of choice set generation algorithm Capturing Correlation with Subnetworks in Route Choice Models p.21/21
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