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Incidence rate

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A research is student is interested at looking at a certain effect of a drug. He has database with 15 year worth of information. He intends to measure the risk by using incidence rate. To get the exposure in terms of person-years he multiplies the number of people in the cohort by 15.
Does this under or overestimates exposure? What else is wrong with this proposal?

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This solution explores the relationship between incidence rate and exposures, and how the incidence rate can under or overestimates exposures.

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A research is student is interested at looking at a certain effect of a drug. He has database with 15 year worth of information. He intends to measure the risk by using incidence rate. To get the exposure in terms of person-years he multiplies the number of people in the cohort by 15.
Does this under or overestimates exposure? What else is wrong with this ...

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