[R-sig-ME] extracting random effect standard deviation

Daniel Ezra Johnson danielezrajohnson at gmail.com
Fri Aug 1 20:38:03 CEST 2008


How can I 'extract' the value of a random effect's standard deviation
from an lmer model?
This number is (a rather important) part of the usual lmer() output
but I cannot figure out anywhere in str(lmer.model) where it can be

I can get it from summary(lmer.model)@REmat[,4], but that 'extra' call
to summary is slowing down my program.

Obviously the model has this information in it somewhere because the
model listing contains it.
How can I get it out?


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