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111 examine how the current outdegree and indegree of a node is related to the number of newly created and received links per day. Figure 6.4 shows that the outdegree of nodes is positively linearly correlated with the number of new links created per node per day. This is a necessary, but not sufficient condition for the validity of the preferential creation mechanism. Figure 6.4 also shows, for the three directed networks, that the increase in node indegree is linearly correlated with the current indegree of the node. Similarly, this is a necessary condition for the validity of the preferential reception mechanism. 6.4.3 Discussion Our data shows that a necessary condition for preferential attachment, a positive correlation between the degree of a node and the number of new links, is present in all five networks. However, this alone is insufficient to claim that any specific mechanism (such as the BA model) is the mechanism that is causing the growth, as a number of different mechanisms could also result in this correlation. In the next section, we more closely examine the growth data to look for further evidence of specific growth mechanisms. 6.5 Proximity bias in link creation In this section, we take a closer look at our growth data to look for evidence of specific global or local mechanisms that lead to preferential attachment. We look forPDF Image | Online Social Networks: Measurement, Analysis, and Applications to Distributed Information Systems
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