I forgot to cc: the list on this reply.
---------- Forwarded message ----------
From: Douglas Bates <[EMAIL PROTECTED]>
Date: Jun 29, 2005 6:28 PM
Subject: Re: [R] Extract fixed effects SE from lmer
To: "La Sorte, Frank A." <[EMAIL PROTECTED]>
On 6/29/05, La Sorte, Frank A. <[EMAIL PROTECTED]> 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")
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