Fig. 2
From: Social identity and cooperation co-evolve in a multilevel public goods game
Proportions of actions (a–c) and thresholds met (d,e) in groups across the experimental conditions. Boxplots show distributions, with whiskers to 1.5 times the interquartile range. Each jittered circular point shows the proportion for a single group and crosses denote mean rates. Significance levels, adjusted using a Holm–Bonferroni correction for multiple comparisons, are denoted as follows: NS p > 0.05, *p < 0.05, **p < 0.01, ***p < 0.001.
