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Yayın Statistical analysis of bus transportation networks for four largest cities in Turkey(Işık Üniversitesi, 2011-06-01) Çoban, Veysel; Atan, Sabri Tankut; Işık Üniversitesi, Fen Bilimleri Enstitüsü, Endüstri Mühendisliği - Yöneylem Araştırması Yüksek Lisans ProgramıNetwork properties for public bus transportation networks (BTNs) of four largest cities (İstanbul, İzmir, Ankara, Bursa) in Turkey have been analyzed under C-, L- and P-Space topologies. Node degree distributions are shown to follow power-law distribution indicating scale-free nature of the networks. Furthermore, the networks have been growing preferentially with the exception of Bursa. Degree-degree correlations of nodes were studied in assortativity. The networks have small shortest- path values. For example, in İstanbul the maximum shortest path was found to be 4 in C-Space meaning that one needs at most 4 transfers to reach any point in the network. Correlation between mean shortest path lengths and nodes of given degrees of single end nodes are shown to fol!ow power-law in L-Space. Degree, eigenvector, closeness, and betweenness Central ities of nodes were calculated, and correlation between mean centrality values and degree were well described by power-law. Thus, in summary, BTNs show small-world and scale-free properties. We also investigated the impacts of two recent projects, Metrobüs and the Third Bosphorus Bridge, on bus network properties in İstanbul.
