Fitness-dependent topological properties of the World Trade Web
Fitness-dependent topological properties of the World Trade Web
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DOI：
10.1103/physrevlett.93.188701
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发表时间：
2004-10-29
影响因子：
8.6
通讯作者：
Loffredo, MI
中科院分区：
文献类型：
--
作者：
Garlaschelli, D;Loffredo, MI
在提出的网络模型中，隐变量（或好的更富有）模型特别有趣，即使尚未在真实的网络上对其假设进行明确的实证检验。在这里，我们提供了第一个实证检验这一机制的世界贸易网络，网络定义的世界各国之间的贸易关系。我们发现，幂律分布的国内生产总值可以成功地确定与隐变量（或健身）确定的世界贸易网络的拓扑结构：所有以前研究的属性，直到三阶相关结构（度分布，度相关性，和层次结构）被发现是非常符合模型的预测。连接概率的选择使得网络的所有实现具有相同的度序列是等概率的。
Among the proposed network models, the hidden variable (or good get richer) one is particularly interesting, even if an explicit empirical test of its hypotheses has not yet been performed on a real network. Here we provide the first empirical test of this mechanism on the world trade web, the network defined by the trade relationships between world countries. We find that the power-law distributed gross domestic product can be successfully identified with the hidden variable (or fitness) determining the topology of the world trade web: all previously studied properties up to third-order correlation structure (degree distribution, degree correlations, and hierarchy) are found to be in excellent agreement with the predictions of the model. The choice of the connection probability is such that all realizations of the network with the same degree sequence are equiprobable.