Chain referral samples are not appropriate when there is a limited or disappointingly short sample frame and when respondents can provide the names of others who would qualify for the survey.

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Chain referral sampling, also known as snowball sampling, is particularly useful precisely when there is a limited or hard-to-reach population and when respondents can indeed provide the names of others who qualify for the survey, allowing researchers to reach more participants through referrals.

Chain Referral Samples Are Not Appropriate When There Is a Limited