社交网络等级结构与同配性问题研究

Assessing the Hierarchical Structure and Assortativity Coefficient in Social Network Services

选取几种具有代表性的社交网络进行对比分析。在网络建模方面,按照节点间紧密程度和连接渠道,将网络结构划分为有中心网络结构和无中心网络结构两种形式。在网络统计特征分析方面,发现两类网络结构模型间存在较大的差异。首先是两者在网络层次化结构方面,有中心的社交网络呈现明显等级结构特征,而无中心的社交网络不具备这种结构特征;再者在同配性分析方面,虽然社交网络同配系数均为负,表现出异配特征,但是无中心的社交网络表出的异配性不如有中心的社交网络的显著。

This paper selects several representative social network services as samples.In accordance with the layout pattern of interconnections of the nodes,the structure models of social network services are divided into two forms,individual-centered service and group-centered online community service.Especially,comparing with results of the statistic characteristics of different networks,we find that there is some significant differences between two types of structure modes.First,individual-centered service has the characteristics of hierarchical structure,but group-centered online community service has not the same structural feature.Second,the social network service is a disassortative network,where the assortativity coefficient is less than zero.However,the disassortativity of the individual-centered service is more significant than the group-centered online community service.