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Dictionary

VOLUNTEER SAMPLING

Victor Jupp

A form of case selection which is purposive rather than based on the principles of random or probability sampling. It usually involves individuals who agree to participate in research, sometimes for payment. However, it can involve other units of analysis, for example when organizational heads volunteer their institutions as sites for research. The basic principle of random or probability sampling is that every case in the population being studied has an equal and non-zero chance of being selected as a sample member. If random selection is used it is possible to use probability theory to make statistical inferences about the population from a sample selected from it. For example, it is ...

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