Referral samples are most appropriate when there is a limited sample frame and when respondents can provide the names of others who would qualify for the survey.

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Referral samples are most effective when there is a limited sample frame and when respondents can provide the names of others who would qualify for the sample. This method helps to expand the sample size and can be particularly useful in hard-to-reach populations.

Referral Samples Are Most Appropriate When There Is a Limited