If a researcher uses stratified sampling in his/her study, is it necessary for the researcher to form the strata or whether the researcher can make use of the already existing strata?
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My understanding is that both methods are acceptable. See my essay cited below; the PDF is available here on researchgate.net:
Webb, L. M., & Wang, Y. X. (2013). Techniques for sampling on-line data sets. In W. C. Hu & N. Kaabouch, Eds., Big data management, technologies, and applications (p. 95-114). Hershey, PA: IGI Global Publishers [ ISBN13: 9781466646995, ISBN10: 1466646993, EISBN13: 9781466647008].
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