Published Online: 15 JUL 2005
Copyright © 2005 John Wiley & Sons, Ltd
Encyclopedia of Biostatistics
How to Cite
Gail, M. H. 2005. Observational Study. Encyclopedia of Biostatistics. 6.
- Published Online: 15 JUL 2005
An observational study is a study in which conditions are not under the control of the investigator, unlike an experimental study. Because randomization of exposure levels is not part of an observational study, associations with exposure may result from confounding by factors associated both with exposure and health outcome.
- observational study;
- experimental study;