Abstract
A primary model of schoolmate relationship network is built in this paper based on social network services, topological structure of this network is studied combined with the knowledge of complex network theory. The actual relational data was obtained from an online social networking site-Renren.com open to college student, and the schoolmate network was constructed upon the database. Statistical quantities such as degree distribution, average shortest path length, clustering coefficient, assortativity coefficient etc. are calculated and analysed to capture the feature of the network. It is observed that the network is scale-free, has small-world property, and exhibits disassortative mixing pattern. Mechanism for the formation of some characteristics is also analysed and primarily illustrated, providing empirical foundation for further research about dynamical behaviours. Index Terms - online social network; topological structure; complex network.
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