Fig. 2: Effect sizes of observability across nations.
From: National parochialism is ubiquitous across 42 nations around the world
Forest plot displaying effect size of observability predicting cooperation. For each nation, we report estimated standardized mean difference (Cohen’s dc) and 95% confidence interval in the right side of the plot. A positive d value indicates higher cooperation in the public treatment compared to the private treatment. The overall estimated population effect sizes are represented by the black diamonds, which correspond to the 95% confidence interval. Source data are provided as a Source Data file.
