Triad census analysis.
The triad census analysis of the triad distribution showed that the observed network has a significant excess of transitive triads (N=76) followed by a significant deficit of cyclical triads (N=8). Triad types that are positive (i.e. non-overlapping at 0) occurred in excess in the observed network, while triad types that are negative showed a deficit in the observed network as compared to the random null network (Fig 2).
The remaining five triads in the network did not show any significant differences in the mean triad percentage rates between the observed and expected network. While the data showed a clear excess of transitive triangles (34.55 %) and deficit for cyclical triangles (3.6%), the distribution for pass-along triads shows a less typical pattern with the 95% confidence intervals crossing the zero line but the mean percentage still showing a deficit.