[R] extract variance for random effects from "mer" object

Maas James Dr (MED) J.Maas at uea.ac.uk
Thu Apr 7 13:03:52 CEST 2011

I get an output from a glmer package, but would like to extract the variance of the Random effects, in this case called trtpair and the value is 0.

Can I extract it directly or do I need to do some further calculations on the "mer" object to get it?



> class(fednmaout)
[1] "mer"
[1] "lme4"
> fednmaout
Generalized linear mixed model fit by the Laplace approximation 
Formula: cbind(fednmadat$events, fednmadat$patnums - fednmadat$events) ~      treat + tn + (1 | trtpair) 
   AIC   BIC logLik deviance
 84.01 153.1 -9.006    18.01
Random effects:
 Groups  Name        Variance Std.Dev.
 trtpair (Intercept)  0        0      
Number of obs: 60, groups: trtpair, 3

Dr. Jim Maas
University of East Anglia

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