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...measurements (binary response), the second one includes 40 individuals. The 'individuals' differ only in different x values. I fitted logistic regression models with and without random intercepts. The coefficients and p values between dummy.glm20 and dummy.glmm20 differ. However, dummy.glm40 and dummy.glmm40 have the same coefficients and p values, respectively. Did the solution in the second example not converge (only one iteration step)? Why does the AIC between e.g. dummy.glm20 and dummy.glmm20 differ so much? And last question: how can dummy.glm20 and dummy.glmm20 be compared w...