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Cumulative incidence

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Cumulative incidence is a measure of frequency, as in epidemiology, where it is a measure of disease frequency during a period of time.

Cumulative incidence is calculated by the number of new cases during a period divided by the number of people at risk in the population at the beginning of the study.

It may also be calculated by the incidence rate multiplied by duration.

CI(t)=1-e^{-IR(t) * D}\,

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