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{{StatsPsy}}
 
{{StatsPsy}}
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In [[epidemiology]] and [[statistics]], an '''observational study''' draws inferences about the possible effect of a treatment on subjects, where the assignment of subjects into a treated group versus a [[control group]] is outside the control of the investigator.<ref name="urlObservational study">{{Cite web|url=http://www.medicine.ox.ac.uk/bandolier/booth/glossary/observ.html |title=Observational study |work= |accessdate=2008-06-25}}</ref><ref>{{cite book |editor-last=Porta |editor-first=M. |title=A Dictionary of Epidemiology |edition=5th |location=New York |publisher=Oxford University Press |year=2008 |isbn=9780195314496 }}</ref> This is in contrast with [[experiment]]s, such as [[randomized controlled trial]]s, where each subject is randomly assigned to a treated group or a control group.
 
In [[epidemiology]] and [[statistics]], an '''observational study''' draws inferences about the possible effect of a treatment on subjects, where the assignment of subjects into a treated group versus a [[control group]] is outside the control of the investigator.<ref name="urlObservational study">{{Cite web|url=http://www.medicine.ox.ac.uk/bandolier/booth/glossary/observ.html |title=Observational study |work= |accessdate=2008-06-25}}</ref><ref>{{cite book |editor-last=Porta |editor-first=M. |title=A Dictionary of Epidemiology |edition=5th |location=New York |publisher=Oxford University Press |year=2008 |isbn=9780195314496 }}</ref> This is in contrast with [[experiment]]s, such as [[randomized controlled trial]]s, where each subject is randomly assigned to a treated group or a control group.
   

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