- Fig. 6.1. Interaction effects on measures of cooperation, nation-year unit of analysis. Note: Solid lines indicate statistically significant relations; nonsignificant relations are marked by dashed lines. Bars in the figure are 95 percent confidence intervals.Significant differences between the effects of different values of the intervening variable (e.g., state age) exist when the confidence intervals associated with one level (e.g., mature) do not overlap with the confidence intervals associated with another level (e.g., new).
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