question about the lme result

-----Oorspronkelijk bericht-----
Van: r-sig-mixed-models-bounces at r-project.org [mailto:r-sig-mixed-models-
bounces at r-project.org] Namens Lao Meng
Verzonden: woensdag 27 juli 2011 9:26
Aan: r-sig-mixed-models at r-project.org
Onderwerp: [R-sig-ME] question about the lme result

Hi all.
My data is a longitudinal data,which measure everyone(id)'s CD4 level at some
specific time point.All persons are grouped into 3 groups(0,1,2,3).

y:sqrt(CD4)
x:time,GROUP(3levels: 0,1,2,3)

data_ori is my original data,which inclues:CD4,group,time,id.

I performed a linear mixed model using lme:
result <- lme(sqrt(CD4) ~ group*time,random = ~time|id,data=data_ori)

From the summary(result),I can only get the intercept and slope of

GROUP0(which is described as "intercept" and "time").
If I wanna get intercepts and slopes of GROUP1,GROUP2,GROUP3,how can I
do?

Simply,I can do this manually by the following steps(GROUP1 for instance):
"intercept" + GROUP1 = intercept_GROUP1; "time" + time:GROUP1 =
slope_GROUP1;

But is there any "shortcut" method to choose?Also,I cann't get the
corresponding SE and p value for each parameter.So the above
"manually"method is not effective to some degree.

Any help from you are welcome.

Many thanks!

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