Figure 5. The effect of third-party influence on the willingness to donate among seeds and invitees.

To facilitate interpretation of the odds ratios, the figure shows the estimated donation rate and 95% confidence intervals based on a random-intercept linear regression model with robust standard errors corresponding to the random-intercept logistic model in Table 1D. The robust standard errors adjust for possible heteroskedasticity with a binary dependent measure. Relative to the 0–75 baseline, the donation rate declines with the level of observed donation among seeds but not among invitees.