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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