We applied the network theory to the global world migration phenomenon, seen as a directed network (flow of migrants between world countries from 2006 to 2010) and measured different centralities statistics: in and out-degree, in and out-closeness, and clustering coefficient. One of the important findings is that distributions of out-degree and in-degree for immigration and emigration are completely different aspects of the same phenomenon. The out-degree distribution is uniform with a Gaussian distribution when the in-degree distribution is compound by several groups depending on the in-degree and the in-weight. The receptor countries-nodes, which have large values of in-weight, can be divided into two groups: the developed countries (with low clustering coefficient but large values of the in-degree) and a small group of countries (with high clustering coefficient and small in-degree values). The countries-nodes with large out-weight can be divided into two subgroups with a high clustering coefficient. One of these groups is well connected and forms with the group of the developed countries an in-subgroup of diameter 2 thanks to the double links between them. The second group is characterized by low values of the in-degree (some with null value) and is connected to the rest of the network mainly by out-degrees. Finally, the Latin American countries may be seen as a homogeneous fifth group.

我们将网络理论应用于全球世界移民现象，该现象被视为有向网络（2006年至2010年世界各国之间的移民流动），并测量了不同的中心统计数据：进出度，进出度和出入度以及聚类系数。重要发现之一是，出入境和出入境的学位和学位的分布完全是同一现象的不同方面。当根据度数和重量而将度数分布由几组复合时，度数分布与高斯分布一致。重量较大的接收者国家/地区节点可分为两类：发达国家（聚类系数低，但度数较大）和一小群国家（聚类系数高，度数小）。具有较大权重的国家/地区节点可以分为具有较高聚类系数的两个子组。这些小组中的一个紧密相连，由于它们之间的双重联系，它们与发达国家小组形成了直径为2的分组。第二组的特征是入度较低（某些值为零），并且主要通过出度连接到网络的其余部分。最后，拉丁美洲国家可能被视为同质的第五集团。这些小组中的一个紧密相连，由于它们之间的双重联系，它们与发达国家小组形成了直径为2的分组。第二组的特征是入度较低（某些值为零），并且主要通过出度连接到网络的其余部分。最后，拉丁美洲国家可能被视为同质的第五集团。这些小组中的一个紧密相连，由于它们之间的双重联系，它们与发达国家小组形成了直径为2的分组。第二组的特征是入度较低（某些值为零），并且主要通过出度连接到网络的其余部分。最后，拉丁美洲国家可能被视为同质的第五集团。