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The reciprocity index can also be calculated using not the original recruitment matrix, but the demographically adjusted recruitment matrix (Heckathorn, 2002). This corrects for differences in cross-count recruitments that are due, not to non-random recruitment from personal networks, but from differential recruitment, such as HIV-positive recruiting more than HIV-negatives. However, because demographic adjustment tends to reduce cross-counts differentials, this approach yields a less conservative form of the index.
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Ramirez-Valles, J., Heckathorn, D.D., Vázquez, R. et al. The Fit Between Theory and Data in Respondent-Driven Sampling: Response to Heimer. AIDS Behav 9, 409–414 (2005). https://doi.org/10.1007/s10461-005-9031-0
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DOI: https://doi.org/10.1007/s10461-005-9031-0