- Probability Sample: What is happening as a whole and why?
- Not appropriate for case study selection, but can use sampling for embedded units.
- Convenience Sample: In this site, selected for data collection convenience, what is happening and why?
Defining the Sampling Unit - Family/kinship group
- Small group
- E.g. What is a community?
- Geographic area
- E.g. How define boundaries of a neighborhood?
- Time period
GENERALIZING FROM THE SINGLE CASE STUDY? - Naturalistic generalization . Not scientific, but intuitive, based on personal or vicarious direct experience (Stake)
- Transferability and fittingness. The “fit” or similarity between two cases determines the transferability of conclusions from one to the other (Lincoln & Guba)
- Replication
- A finding emerging repeatedly across study of numerous sites yields a good working hypothesis
- The more different the sites, the stronger the working hypothesis
- Robert Yin: Ruling out rival hypotheses
- If two or more cases are shown to support the same theory, replication may be claimed.
- The empirical results are stronger if two or more cases support the same theory but do not support an equally plausible, rival theory.
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