Determinants of social information use.

The predictor ‘model type’ was coded as 0 when the source of social information was a peer and as 1 when the source was an adult. The predictor ‘household type’ was coded as 0 if a participant lived in a ‘nuclear’ household, and as 1 when they lived in an ‘extended’ household including grandparent(s). Gender was coded as 0 for males and 1 for females. Model 1 is a linear mixed model fitted to participants’ mean adjustment (S) across the five rounds in an experimental condition. As dependent variable, this model included two data points for each participant: (i) mean adjustment when observing a peer (Speer) and (ii) mean adjustment when observing an adult (Sadult). Model 2 was a logistic generalized mixed model (GLMM) fitted to decisions to stay with one’s own first estimate (coded as 1) or move towards the social information (coded as 0). Model 3 was a logistic GLMM fitted to decisions to copy the social information (coded as 1 if social information was copied, 0 if it was not). In all models, we used ‘participant nested in school’ as random effect.