R help - Jul 2003 - Q re Linear Models

Hello,

I apologize in advance if what I'm about to ask is trivial or has been 
answered before. In the latter case I would appreciate a pointer to the 
right list/location

I'm trying to model the following experimental design with groupedData 
and lme in R:

Subjects were measured on two tasks (continuous outcome variable is 
"Prob", tasks are coded as within-subjects factor "Domain").
Subjects
are recruited from three different groups ("Group") and assigned to 
three different conditions ("Rules"). These all appear to be fixed 
between-subjects factors. The effect I'm after is that of "Rules".

Additionally, I've measured for each observation (for each subject for 
each task) four continuous variables ("SelfAssessment",
"Usefulness",
"Information" and "Ease") that I'd like to include as
covariates. These
of course may partially depend on the subject. Additionally, in a 
post-test I measure yet another continuous variable for each subject 
("UMLTTL").

The problem I have is that I'm not sure how to properly include these 
continuous covariates in the groupedData formulas and the lme formulas.

Any help will be appreciated, either on the list of by email.

Many many thanks in advance.

  Joerg

Do you have Pinhiero and Bates (2000) Mixed-Effects Models in S and 
S-Plus (Springer)?  For me, "lme" is a Ferrari not a Volkswagen, and I
had to read a portion of this book before I could get much of anything 
out of "lme".

hope this helps.  spencer graves

Joerg Evermann wrote:
> Hello,
> 
> I apologize in advance if what I'm about to ask is trivial or has been 
> answered before. In the latter case I would appreciate a pointer to the 
> right list/location
> 
> I'm trying to model the following experimental design with groupedData 
> and lme in R:
> 
> Subjects were measured on two tasks (continuous outcome variable is 
> "Prob", tasks are coded as within-subjects factor
"Domain"). Subjects
> are recruited from three different groups ("Group") and assigned
to
> three different conditions ("Rules"). These all appear to be
fixed
> between-subjects factors. The effect I'm after is that of
"Rules".
> 
> Additionally, I've measured for each observation (for each subject for 
> each task) four continuous variables ("SelfAssessment",
"Usefulness",
> "Information" and "Ease") that I'd like to include
as covariates. These
> of course may partially depend on the subject. Additionally, in a 
> post-test I measure yet another continuous variable for each subject 
> ("UMLTTL").
> 
> The problem I have is that I'm not sure how to properly include these 
> continuous covariates in the groupedData formulas and the lme formulas.
> 
> Any help will be appreciated, either on the list of by email.
> 
> Many many thanks in advance.
> 
>  Joerg
> 
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