Figure 3
From: K-core robustness in ecological and financial networks
Example network of the S&P 500. (a) Schematic of the network built from pairwise interactions Jij between 489 stocks in the 100-day window ending 22 June 1998. Nodes are colored according to the financial sector to which they belong, and node size increases with degree. Interactions are symmetric, i.e., Jij = Jji. (b,c) show the distribution of pairwise correlations Cij and nonzero pairwise interactions Jij, respectively. It is important to note that, while the Cij shown in (b) take some negative values, the nonzero Jij shown in (c) are all positive. To determine the tipping point of a network using Eq. 1, Jij > 0 are necessary.
