Which form of nonrandom sampling is most appropriate for use when members of the research population are especially difficult to find?

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Snowball sampling, during which each subject used in the research study is asked to identify other potential research subjects who have the characteristics to be studied, is particularly effective with a population that is difficult to find and therefore has no sampling frame. Quota sampling, which is a variation on convenience sampling, involves setting quotas and then using convenience sampling to select participants to fill the quotas. With purposive sampling, the researcher specifies the characteristics of the population of interest and then locates individuals who match those characteristics. Convenience sampling is used when the researcher selects people who are most easily located or most available for participation in the research study.

Which Form of Nonrandom Sampling Is Most Appropriate for Use