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. 2014 Jul 9;9(7):e100805. doi: 10.1371/journal.pone.0100805

Figure 4. Symmetry and asymmetry depends on the distribution of the initial connectivity.

Figure 4

A Example of an adjacency matrix in a random network with pruning parameter Inline graphic and symmetry measure Inline graphic According with the p-value test with the null hypothesis of random connectivity and with a level of confidence of Inline graphic the symmetry of this network is significant if the distribution of the initial connections is uniform but is non-significant if the initial distribution of the connections is Gaussian. Therefore, in the first case it should be regarded as a non-random network whereas in the second case as a random network. B The same as A but with pruning parameter Inline graphic and symmetry measure Inline graphic In this case, with the same hypothesis test, the situation is reversed: the network should be considered random for initial uniform distribution of connections, but non-random for initial Gaussian-distributed connections (see the discussion in the text).