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A rate ratio (sometimes called an incidence density ratio) in epidemiology, is a relative difference measure used to compare the incidence rates of events occurring at any given point in time. A common application for this measure in analytic epidemiologic studies is in the search for a causal association between a certain risk factor and an outcome.[1]
Where incidence rate is the occurrence of an event over person-time, for example person-years.
References[]
- ↑ Bellan, Steve Study Design and Analysis in Epidemiology: Where does modeling fit?. URL accessed on 8 April 2012.
- ↑ http://www.ctspedia.org/do/view/CTSpedia/RateRatio
- ↑ http://www.ctspedia.org/do/view/CTSpedia/RateRatio
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