Scale-free networks are rare

A central claim in modern network science is that real-world networks are typically null null meaning that the fraction of nodes with degree kfollows a power law, decaying like k^{-\alpha} often with 2 < \alpha < 3 However, empirical evidence for this belief derives from a relatively small number of real-world networks. We test the universality of scale-free structure by applying state-of-the-art statistical tools to a large corpus of...