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28588k
2004 Aug 19
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NLME: Holding constant the across group correlational structure of the fixed effects in nlme
Hello all.
I was wondering if there is a way to hold constant the fixed effects correlation structure across multiple groups?
For example, I have two groups and I fit a three parameter logistic growth curve where the fixed effects are free to vary across the groups. I'll paste in the code as a concrete example:
> Result.NLME <- nlme(Score ~ SSlogis(Time, Asym, xmid, scal),
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