[R-sig-ME] how to locate standard errors in lmer output

[Douglas Bates]

 Thu, Mar 27, 2008 at 5:06 AM, F.-Xavier ALARIO
<Francois-Xavier.Alario at univ-provence.fr> wrote:
>  I have been looking in various documentations (e.g. in
>  http://rweb.stat.umn.edu/R/library/lme4/doc/) for a way to access
>  Standard Errors of fixed effects in the output of the 'lmer' function.
>  slotNames() didn't help.

>  Is there a way to do it similar to fixef(), ranef() or with a slot name?

The preferred way would be

stderr <- sqrt(diag(vcov(fm)))

for a single evaluation.  (If you were putting such a calculation
within a large simulation you may want to work harder to tune it up
but this is fine for a single evaluation.)

>  I have the same question for t-values.

fixef(fm)/stderr

The obvious next question is about the p-values but that's a sore
point so don't ask. :-)