Cullmann, Astrid; Farsi, Mehdi; Filippini, Massimo - DIW Berlin (Deutsches Institut für Wirtschaftsforschung) - 2009
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...