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arXiv physics/0612169physics.soc-ph
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复杂有向网络中的聚类

Clustering in Complex Directed Networks

Giorgio Fagiolo

摘要:

许多经验网络显示出一种固有的集群趋势,即形成连接节点的圆圈。该特征通常通过聚类系数(CC)来测量。CC最初是为二进制无向图引入的,最近已被推广到加权无向网络。在这里,我们将CC扩展到(二进制和加权)有向网络的情况下,我们计算其期望值的随机图。我们区分对图中的所有有向三角形进行计数(独立于其边的方向)的CC和仅考虑特定类型的有向三角形(例如,循环)。主要的概念是通过使用世界贸易流量的经验数据来说明的。

英文摘要:

Many empirical networks display an inherent tendency to cluster, i.e. to form circles of connected nodes. This feature is typically measured by the clustering coefficient (CC). The CC, originally introduced for binary, undirected graphs, has been recently generalized to weighted, undirected networks. Here we extend the CC to the case of (binary and weighted) directed networks and we compute its expected value for random graphs. We distinguish between CCs that count all directed triangles in the graph (independently of the direction of their edges) and CCs that only consider particular types of directed triangles (e.g., cycles). The main concepts are illustrated by employing empirical data on world-trade flows.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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