Observational Study

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. 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 before the start of the treatment.

Read more about Observational Study:  Reasons For Uncontrolled Experimentation, Degree of Usefulness and Reliability, Discussion

Other articles related to "observational study, observational, study":

Science Experiments - Contrast With Observational Study
... An observational study is used when it is impractical, unethical, cost-prohibitive (or otherwise inefficient) to fit a physical or social system into a laboratory setting ... In order for an observational science to be valid, confounding factors must be known and accounted for ... In these situations, observational studies have value because they often suggest hypotheses that can be tested with randomized experiments or by ...
Statistics - Statistical Methods - Experimental and Observational Studies - Observational Study
... An example of an observational study is one that explores the correlation between smoking and lung cancer ... This type of study typically uses a survey to collect observations about the area of interest and then performs statistical analysis ... non-smokers, perhaps through a case-control study, and then look for the number of cases of lung cancer in each group ...
Observational Study - Discussion
... A major challenge in conducting observational studies is to draw inferences that are acceptably free from influences by overt biases, as well as to assess the influence of potential hidden ... several prominent medical researchers issued the Strengthening the Reporting of Observational Studies in Epidemiology (STROBE) statement, in which they called for observational studies to ...

Famous quotes containing the word study:

    The study and knowledge of the universe would somehow be lame and defective were no practical results to follow.
    Marcus Tullius Cicero (106–43 B.C.)