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The discriminative functional mixture model for a comparative analysis of bike sharing systems

Charles Bouveyron 1 Etienne Côme 2 Julien Jacques 3, 4 
3 MODAL - MOdel for Data Analysis and Learning
LPP - Laboratoire Paul Painlevé - UMR 8524, Université de Lille, Sciences et Technologies, Inria Lille - Nord Europe, METRICS - Evaluation des technologies de santé et des pratiques médicales - ULR 2694, Polytech Lille - École polytechnique universitaire de Lille
Abstract : Bike sharing systems (BSSs) have become a means of sustainable intermodal transport and are now proposed in many cities worldwide. Most BSSs also provide open access to their data, particularly to real-time status reports on their bike stations. The analysis of the mass of data generated by such systems is of particular interest to BSS providers to update system structures and policies. This work was motivated by interest in analyzing and comparing several European BSSs to identify common operating patterns in BSSs and to propose practical solutions to avoid potential issues. Our approach relies on the identification of common patterns between and within systems. To this end, a model-based clustering method, called FunFEM, for time series (or more generally functional data) is developed. It is based on a functional mixture model that allows the clustering of the data in a discriminative functional subspace. This model presents the advantage in this context to be parsimonious and to allow the visual-ization of the clustered systems. Numerical experiments confirm the good behavior of FunFEM, particularly compared to state-of-the-art methods. The application of FunFEM to BSS data from JCDecaux and the Transport for London Initiative allows us to identify 10 general patterns, including pathological ones, and to propose practical improvement strategies based on the system comparison. The visual-ization of the clustered data within the discriminative subspace turns out to be particularly informative regarding the system efficiency. The proposed methodology is implemented in a package for the R software , named funFEM, which is available on the CRAN. The package also provides a subset of the data analyzed in this work.
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Submitted on : Wednesday, July 29, 2015 - 6:55:19 PM
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Charles Bouveyron, Etienne Côme, Julien Jacques. The discriminative functional mixture model for a comparative analysis of bike sharing systems . Annals of Applied Statistics, Institute of Mathematical Statistics, 2015, 9 (4), pp.1726-1760. ⟨10.1214/15-AOAS861⟩. ⟨hal-01024186v3⟩



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