Excess risk

Excess risk

In statistics, excess risk is a measure of the association between a specified risk factor and a specified outcome (such as contracting a disease). It is the difference between two proportions—in epidemiology it's typically defined to be the difference between the proportion of subjects in a population with a particular disease who were exposed to a specified risk factor( P(D|E)) and the proportion of subjects with that same disease who were not exposed (P(D| not E)). That is,

"ER" = P(D|E) - P(D| not E)

Note that this definition entails that -1 ≤ "ER" ≤ 1.

External links

* [http://www.rerf.or.jp/eigo/glossary/riskexce.htm Excess risk]


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