Control Event Rate

Proportion of control group participants with the outcome of interest

The control event rate (CER) is the proportion of participants in the control group that have the outcome. Control event rate is an important calculation for computing absolute risk reduction (ARR) or absolute risk increase (ARI). Here is the formula for control event rate: 
The control event rate is the proportion of control participants that had the outcome of interest.
Control Event Rate (CER)
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Experimental Event Rate
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