  Network surveys of key populations at risk for HIV are an essential part of
the effort to understand how the epidemic spreads and how it can be prevented.
Estimation of population values from the sample data has been probematical,
however, because the link-tracing of the network surveys includes different
people in the sample with unequal probabilities, and these inclusion
probabilities have to be estimated accurately to avoid large biases in survey
estimates. A new approach to estimation is introduced here, based on resampling
the sample network many times using a design that adheres to main features of
the design used in the field. These features include network link tracing,
branching, and without-replacement sampling. The frequency that a person is
included in the resamples is used to estimate the inclusion probability for
each person in the original sample, and these estimates of inclusion
probabilities are used in an unequal-probability estimator. In simulations
using a population of drug users, sex workers, and their partners for which the
actual values of population characteristics are known, the design-adherent
estimation approach increases the accuracy of estimates of population
quantities, largely by eliminating most of the biases.
