Fig. 3.

Estimating population proportions via RDS with the Add Health data. Mean coverage probabilities of 95% confidence intervals across the 84 school pairs estimated by the following methods: (i) the naive proportion variance estimator; (ii) the Volz–Heckathorn variance estimator; (iii) the Salganik bootstrap; (iv) the Gile successive-sampling bootstrap; and (v) the tree bootstrap. Sampling was performed with replacement, and attributes are in decreasing order of mean prevalence over the 84 networks. The dashed vertical black lines are at 0.95, so that for a perfectly calibrated method, the symbol would lie on the line.