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Title: Purposive Sampling as a Tool for Informant Selection 
Author: Tongco, Maria Dolores C.
Date: 2007
Publisher: University of Hawaii at Manoa
Citation: Tongco MDC. 2007. Purposive sampling as a tool for informant selection. Ethnobotany Research & Applications 5:147-158.
Abstract: Informant selection is highly relevant for ethnobotanical research, as people are constantly looked upon for knowledge and information. The purposive sampling technique is a type of non-probability sampling that is most effective when one needs to study a certain cultural domain with knowledgeable experts within. Purposive sampling may also be used with both qualitative and quantitative research techniques. The inherent bias of the method contributes to its efficiency, and the method stays robust even when tested against random probability sampling. Choosing the purposive sample is fundamental to the quality of data gathered; thus, reliability and competence of the informant must be ensured.
ISSN: 1547-3465
Keywords: ethnobotany, research methods, indigenous knowledge, data collection, case studies, sampling, experts, reliability, validity, repeatability

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