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In fields such as epidemiology, social sciences, psychology and statistics, an observational study draws inferences from a sample to a population where the independent variable is not under the control of the researcher because of ethical concerns or logistical constraints. One common observational study is 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. This is in contrast with experiments, such as randomized controlled trials, where each subject is randomly assigned to a treated group or a control group. Observational studies, for lacking an assignment mechanism, naturally present difficulties for inferential analysis.
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References
- ↑ "Vernon M. Chinchilli". Library of Congress Name Authority File. Retrieved 2017-08-16.
- ↑ "Vernon Chinchilli — Penn State Eberly College of Science Department of Statistics". stat.psu.edu. Retrieved 2017-08-16.
- ↑ "Vernon Chinchilli Faculty Page". sites.stat.psu.edu. Retrieved 2017-08-16.
- ↑ Vernon Chinchilli at the Mathematics Genealogy Project
- ↑ Brody, Jane E. (1996-10-12). "Analysis of 23 Studies Suggests Abortion Can Slightly Raise the Risk of Breast Cancer". The New York Times. Retrieved 2017-08-16.
- ↑ Mooney, Chris (2003-02-01). "The scientist who hated abortion". Discover Magazine. Retrieved 2017-08-16.
