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Health Services Research (HSR) Methods
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Any planned process that results in the collection of data. In many cases, experiments are those situations in which the researcher has control over some of the conditions under which the experiment is conducted.

Further Reading
Gordis, L. 2000. Epidemiology, 2nd ed., Philadelphia, PA: Elsevier Science.

University of Glasgow. Statistics Glossary. Available at http://www.stats.gla.ac.uk/steps/glossary/alphabet.html .