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An observational study is an empiric investigation of the effects caused by a treatment, policy, or intervention in which it is not possible to assign subjects at random to treatment or control, as would be done in a controlled experiment.
- Format: Pocket/Paperback
- ISBN: 9781441931917
- Språk: Engelska
- Antal sidor: 377
- Utgivningsdatum: 2010-12-01
- Förlag: Springer-Verlag New York Inc.