Get the phi skew-symmetry of a sociomatrix.
A matrix with individuals ordered identically in rows and columns.
The phi skew-symmetry index of
Leiva D et al, 2008, Testing reciprocity in social interactions: A comparison between the directional consistency and skew-symmetry statistics, Behav Res Methods.
Phi is the skew-symmetry index (0 means completely symmetric, 0.5 means completely not symmetric)
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