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In a meeting http://www.autoandmotorfun.com/alendronate-rxlist-9b68.pdf#flaming alendronate rxlist
Simplifying somewhat, we start with data which includes information on patients’ death or survival, and correlates that, using so-called regression analysis, with some observed characteristics – mostly specific health conditions and demographic characteristics. So we can say, for example, that a 55 year old male lung cancer patient has on average an X% chance of dying. Express that on a hospital level, and you have “expected†deaths. “Excess†deaths (or “excess†survival) are just the difference between actual deaths and the number “predicted†by the regression model for each individual hospital.  A hospital with no excess deaths is one that performs exactly as the model predicts.
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