[R] confidence intervals for linear combinations when using lme

From: <Anna.H.Persson_at_astrazeneca.com>
Date: Fri 23 Jul 2004 - 20:36:45 EST


Hi

I really hope someone can help me.

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.

When I write
>library(MASS)

I find lme3, where there is a vcov-function, but if I understand it correctly it works with lm and not with lme...

If I can use lme4 with s-plus 6.1, what shall I do in order to install it on my computer?

I am grateful for all help I can get?

best regards
Anna Persson



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