In the recruitment method known as "snowball sampling," volunteers are invited to help find additional potential subjects.
A non-probability sampling technique called snowball sampling involves enlisting new units as sample members from among the existing ones. To conduct research on individuals with particular characteristics who might be challenging to find otherwise, snowball sampling can be helpful (e.g., people with a rare disease).
In purposive sampling, the researcher employs their judgment to choose appropriate study participants based on their understanding of the context of the systematic investigation. Snowball sampling, however, relies on the researcher's current research participants to assist in identifying additional possible subjects.
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