[R] Q re Linear Models

Spencer Graves spencer.graves at pdf.com
Wed Jul 16 23:23:59 CEST 2003

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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