Fig. 1.

The F-J model of group influence systems is applied to 161 individuals nested in 45 groups, each dealing with a sequence of eight issues, setting up $360$ group-task occasions in which the individuals nested in a group presented an initial and final opinion and 1,288 individual-level behavioral observations. (A) Individuals’ observed and F-J model-predicted final opinions. The Pearson product-moment correlation of the observed and predicted final opinions is $0.939,P<0.001$. (B) Percent frequency histogram of the F-J model prediction errors of final estimates.