Hello Koen, Thank you for your answer! I don't know of a statistical reference for this type of bias reduction for GLMM model, but will of course post if I find something. I can get convergence if I stay reasonable with the number of predictors (less than 10-15 estimated coefficients) but I find my estimated predicted probabilities suspiciously low...and some increasing as I decrease the number of estimated coefficients. I will post as I learn more, Thanks, Van
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