- Peter M Aronow: Department of Political Science, Yale University ; Department of Biostatistics, Yale School of Public Health.
- Forrest W Crawford: Department of Biostatistics, Yale School of Public Health.
We detail nonparametric identification results for respondent-driven sampling when sampling probabilities are assumed to be functions of network degree known to scale. We show that the conditions for consistency of the Volz-Heckathorn estimator are weaker than previously assumed.