Figure 6

Hierarchy influence. Histograms of participants value of H (see text) for the three considered treatments. Results are plotted excluding pure defectors, i.e., participants with near zero H values. Mean values aggregated for all participants and for hierarchy profile classes are reported as inset. We observe more frequently low values of H in SH treatments (53 subjects, distribution skewness γ _SH  = −0.097) with respect to the high values found in CH treatments (68 subjects, γ _CH  = 0.327). Although negatively skewed, overall values in RH treatments (52 subjects, γ _RH  = −0.506) were less scattered and more centered around zero. Again, hierarchy profile types are homogeneously distributed among all hierarchy influence values in SH and CH treatments although hierarchy influence profiles appear dependent on participants’ hierarchy type in RH treatments (comparison of hierarchy influence distributions of low and high types; SH treatments MW U = 381.5, P = 0.593; CH treatments MW U = 627.5, P = 0.547; RH treatments MW U = 452.5, ^*P = 0.035).