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ecological studyA study that compares large groups of people instead of individuals for differences in things such as cancer rates. The groups can differ by location (for example, city, county, or country). They can [..]
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ecological studyA type of epidemiological study where data is analysed at the population or group level rather than the individual. They are inexpensive and easy to carry out, using routinely collected data, but they are prone to bias and confounding. (See also Wikipedia definition)
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ecological studyexamines relationship between exposure and disease with population-level rather than individual-level data (Aschengrau & Seage, 2007, p. 137).
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ecological studyIn epidemiology, a study in which the units of analysis are populations or groups rather than individuals.
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