[selectron]

The real question though is whether this is because the model is biased, or whether it is because the two populations have different levels of risk. If group A had a higher risk than group B, than I would expect the model to have a higher rate of false negatives for group A than for group B. This is just because the model is more likely to (correctly) assign members of group A as high risk, and some of these classifications will be wrong. To check for bias you have to control for this base rate difference.