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    Università della Svizzera italiana

    Unobserved heterogeneity and efficiency measurement in public transport

    Cullmann, Astrid ; Farsi, Mehdi ; Filippini, Massimo

    In: Journal of transport economics and policy, 2012, vol. 46, no. 1, p. 51-66

    Efficiency measurement in public transport requires an adequate account of unobserved network characteristics that are typically modelled as factors separable from the production process. This paper proposes a panel data model that allows for non-separable firm-specific heterogeneity in an input distance function. The proposed model is applied to a sample of German and Swiss urban transit...

    Università della Svizzera italiana

    Unobserved heterogeneity and international benchmarking in public transport

    Cullmann, Astrid ; Farsi, Mehdi ; Filippini, Massimo

    We analyze the technical efficiency of German and Swiss urban public transport companies by means of SFA. In transport networks we might face different network structures or complexities, not observed, but influencing the production process. The unobserved factors are typically modeled as separable factors. However, we argue that the entire production process is organized around different network...