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

From: Maas James Dr (MED) <J.Maas_at_uea.ac.uk>
Date: Thu, 07 Apr 2011 12:03:52 +0100


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?

Thanks

Jim

> class(fednmaout)

[1] "mer"
attr(,"package")
[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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