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第34行： − See also: Global cascades model − − Consider a graph of any reasonable size. Node v’s neighbors can be split into two sets: Set A contains v's neighbors who have adopted a new behavior and B is the set of those behaving conservatively. Node v will only adopt the behavior of those in A if at least a ''q'' fraction of neighbors follow behavior A. − − * if ''q'' is small, the behavior is easily adopted and easily spread − * if ''q'' is large, B is an attractive behavior and it takes more friends to engage in A before v will switch. − − ; Cascading – diffusion over the entire network − : Consider a set of initial adopters who start with a new behavior A, while every other node starts with behavior B. Nodes then repeatedly evaluate the decision to switch from B to A using a threshold of ''q''. If the resulting cascade of adoptions of A eventually causes every node to switch from B to A, then we say that the set of initial adopters causes a complete cascade at threshold ''q''. Clusters of density ''d'' > 1 − ''q'' are obstacles to cascades across the entire network. −
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== 网络中的扩散和级联行为 ==
== 网络中的扩散和级联行为 ==
=== 参见:全局级联模型 ===
=== 参见:全局级联模型 ===
考虑任意大小的图，节点v的邻居可以分成两个集合：集合A包含v中采用新行为的邻居，集合B是行为保守的邻居的集合。只有当至少''q'' 个邻居遵循行为A时，节点v才会采用A中邻居的行为。
考虑任意大小的图，节点v的邻居可以分成两个集合：集合A包含v中采用新行为的邻居，集合B是行为保守的邻居的集合。只有当至少''q'' 个邻居遵循行为A时，节点v才会采用A中邻居的行为。