Natural experiments exist as a type of experimental study distinct from controlled experiments.
Sources
- Experiment (en.wikipedia.org)
- https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7879679/ (ncbi.nlm.nih.gov)
- https://www.gov.scot/binaries/content/documents/govscot/publications/advice-and-guidance/2009/12/social-research-methods-guides/documents/natural-experiments/natural-experiments/govscot:document/Natural+Experiments.pdf (gov.scot)
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