# Feasibility of running mixed-effects poisson/logistic regression with correlation structure such as AR(1), Toeplitz

I'm not aware of any R package that lets me use specify the covariance pattern model such as in the package nlme and run the mixed effects poisson/logistic regression.

Is this because of mathematical limitations or just because I'm not aware of the package?

This isn't a package request because I'm requesting why it's not mathematically possible if it is not possible.

• It is feasible. In SAS PROC GLIMMIX, there is option TOEP and AR(1). So search hard in R. I am not an export on R. – user158565 Aug 12 at 20:33