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Situations where a level of a categorical variable occurs very rarely (eg, a rare disease). This can be a problem especially when the variable is the response variable in a model.
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What are the problems with using a predictor with a low base rate in a GLM?
A reviewer has questioned my use of a dummy coded predictor that has a low base rate of occurrence. Specifically, they question how well my conclusions would generalize given that the event occurs rar …