[R-sig-ME] new R user struggling with error and convergence issues

Jennifer Yourkavitch jenyourkavitch at yahoo.com
Mon Feb 15 21:11:47 CET 2016

Follow-up: glmmPQL works like a charm. I don’t really understand the difference between the algorithms used by glmmPQL and glmer. Should I be concerned that the models ran with glmmPQL but not glmer?

On Feb 15, 2016, at 2:22 PM, Jennifer Yourkavitch <jenyourkavitch at yahoo.com> wrote:

> Hello!
> I am fitting multilevel log-binomial models for a very large dataset (>53,000 observations), using glmer. I am getting this--  Error: (maxstephalfit) PIRLS step-halvings failed to reduce deviance in pwrssUpdate.
> And the model is not converging. 
> I think that increasing the number of iterations may remediate the convergence issue. But I can’t find the right syntax for that online.
> Any advice re these two issues?
> Many thanks,
> Jennifer

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