Fig. 3
From: Empirical evidence for the spread of Cooperation through copying successful groups
Figure 3: Summary of Experiment 1 results showing the effect of observing successful out-group information. Red represents the “Control” condition where the feedback of the 1 st block results includes only the participant’s own group. Blue represents the “Out-group information” condition where the feedback of the 1 st block results includes not only the participant’s own group but also a successful out-group. (a): Violin plot of contributions in the 1 st round for each condition. Dots represent observed data, horizontal lines represent mean values. (b): Line plot showing mean contributions across 30 rounds in each block. Solid lines and shaded regions represent observed values and their standard errors, dashed lines represent predicted values based on GLMM estimates for the linear regression model. (c): Bar plot showing mean contributions across six chunks in each block (one chunk includes five rounds). Error bars represent standard errors. Significance signs for differences between conditions based on estimated marginal means from GLMM results are shown (2nd block chunk 1: Control 10.58 vs. Out-group information 14.21, t (175.67) = 4.60, p =.00; 2nd block chunk 2: Control 6.85 vs. Out-group information 9.44, t (175.67) = 3.28, p =.01).
