Methodological review delineates core qualitative sampling models, highlighting key differences from quantitative probability approaches to guide naturalistic study design.
The probability sampling techniques used for quantitative studies are rarely appropriate when conducting qualitative research. This article considers and explains the differences between the two approaches and describes three broad categories of naturalistic sampling: convenience, judgement and theoretical models. The principles are illustrated with practical examples from the author's own research.
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Martin Marshall (1996) studied this question.
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