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2006 Oct 30
1
Random intercept-slope correlation (nlme)
Dear list members,
I am working with a multilevel growth curve, that in its simplest form goes
like follows:
Yit = Ai + Bi t + eit (the error term is assumed to follow an AR(1)
autorregressive process)
One major topic in my research is the convergence in the values of Y over
time. Thus, I am interested in the relationship between the random effects
for the intercept and the slope, and I have a couple of questions about
this:
First, I have fitted the model using the nlme library in R...