[R] confidence intervals for linear combinations when using lme

[Douglas Bates]

Anna.H.Persson at astrazeneca.com wrote:

> I have just started to work with S-plus, and have not yet understood how it
> really works. I am now trying to fit a mixed effects model with lme. My goal
> is to compare four different groups, at several different time points, and I
> therefore would like to create confidence intervals for linear combinations
> of my estimated parameters (as I usually do with "contrast" or "estimate" or
> "lsmeans" in SAS). I have now found out that the vcov-function in the
> lme4-package could be of great help for me, but I do not know if I can use
> lme4 when working with S-PLUS 6.1, or is it only for R. 

The lme4 package is only available for R at this time.