Multiplicity sampling snowballing

Members of the rare population are located by screening within each individually designated enumeration unit. A respondent who qualifies for the sample is asked to provide the names of others who also presumably qualify. A network of contacts is produced which might include all households containing parents or their children. Each network of households then becomes the sampling unit, from which information about the other members of the network can be obtained.

A major drawback to this method is that there is no way of checking to be sure that the sample is representative of the population of interest.

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