When using glmer in lme4 I frequently get false convergence errors. Many
have posted to this list about this topic. The solution seems to be to
standardize the X matrix first, which is effective at resolving the issue. 
 
Is there, (or could there be in future versions) a simple way to request
that glmer optionally standardize the data internally and return
back-transformed parameter estimates (on the original scale)?
 
It seems that SAS does this by default in PROC GLIMMIX (version 9.2) and
rarely had issues with regression conversion. It would be a huge help.
 
Jeff Evans
Dartmouth College

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