The mere fact the event=200 requires treatment. So the original question may not be imbalance. No, event =200 is not going to give you any strong, sustainable model regardless. Manually running weight is essentially the same as oversampling/oversampling. One goes by count, sampling goes by ratio. Manually weighting is not recommended because such action almost guarantees inability to sum the resampled total weight properly. At using the Weight statement of proc logistic, pay some attention to the norm option on the statement. You will see the impact of using vs not using that option on your model Last, but not the least, I doubt this subject has much to do with objective function.
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