Health Services Research (HSR) Methods
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Selection of a group of subjects (sample) from a larger group (population) using a process that selects each individual randomly (by chance) so that each member of the population has a known chance of being included in the sample. A strategy used to reduce the likelihood of bias.

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