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Health Services Research (HSR) Methods
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Snowball Sampling

A type of non-probability sampling technique in which studying participants are recruited by first identifying a few subjects suitable for the research, and then asking the initial subjects to refer other qualified subjects.

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Further Reading
Gliner, J.A. and G.A. Morgan. 2000. Research Methods in Applied Settings, Mahwah, NJ: Lawrence Erlbaum Associates.