Assuming the degree of node i is ki, these ki nodes are called the neighboring nodes of node i's neighboring nodes. Ei is defined as the number of actual edges among these ki nodes. The possible maximum number of links among the neighboring nodes of node i is ki(ki−1)2 The clustering coefficient Ci is defined as Ci=2Eiki(ki−1) It is an important parameter to measure the degree of agglomeration among the nodes.