R help - Jun 2005 - Extract fixed effects SE from lmer

Hi,
 
Does anyone know how to extract fixed effects SE values from generalized linear
mixed models estimated using the lmer function in the lme4 library?  I searched
attributes and structure with no luck.
 
Thanks
 
Frank A. La Sorte, Ph.D.
Department of Fisheries and Wildlife Sciences
University of Missouri
Columbia, MO 65211 USA

I forgot to cc: the list on this reply.

---------- Forwarded message ----------
From: Douglas Bates <dmbates at gmail.com>
Date: Jun 29, 2005 6:28 PM
Subject: Re: [R] Extract fixed effects SE from lmer
To: "La Sorte, Frank A." <lasortef at missouri.edu>


On 6/29/05, La Sorte, Frank A. <lasortef at missouri.edu>
wrote:
> Hi,
>
> Does anyone know how to extract fixed effects SE values from generalized
linear mixed models estimated using the lmer function in the lme4 library?  I
searched attributes and structure with no luck.
>
Try vcov(myLmerModel).  That returns a variance-covariance matrix for
the fixed effects.  The usual manipulations are used to get the
standard errors.  For the binomial and Poisson families you should use
the optional argument useScale=FALSE as these families do not have a
separately estimated scale parameter in the variance function.

In the "show" method for the summary.lmer class the relevant piece of
code is

              corF <- as(as(vcov(object, useScale = useScale),
"pdmatrix"),
                         "corrmatrix")