Method of snow ball sampling

  Snowball sampling is also known as network, chain referral or reputation sampling method. Snowball sampling which is a non probability sampling method is basically sociometric. It begins by the collection of data on one or more contacts usually known to the person collecting the data. At the end of the data collection process (e.g., questionnaire, survey, or interview), the data collector asks the respondent to provide contact information for other potential respondents. These potential respondents are contacted and provide more contacts. Snowball sampling is most useful when there are very few methods to secure a list of the population or when the population is unknowable.

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