Hi balladw, I know that AVAL is always missing when IMPLEVEL2=IMP1a. I deliberately constructed the data in that way. However I am fitting (or trying to fit) a single imputation model, estimated from the entire dataset and to adjust subsets of those imputations. I am not trying to fit separate imputation models as I think you're implying? Also note that the imputation+shift adjustment is performed for this IMP1a level, (and I think correctly performed). I'm trying to understand the reason for the WARNING. Thanks, Ben
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