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I am trying to use the Linear Mixed Effects module in Phoenix and I am having
problems specifying the random effects using the "Variance structure Tab".
I have a random intercept and slope model with both fixed and random effects on
the same regressor variable. The model goes like this:
Yij = bo+b1*concij+u1+u2*concij+eij
And this statement in the Pheonix guide is confusing.
"The same variable cannot be used in both the fixed effects specification and
the random effects specification unless it is used differently......"
I did try couple of ways of incorporating the model using the" random effects
field" but the estimates were totally off.
Any help will be appreciated.
Center for Translational Medicine
School of Pharmacy
University of Maryland
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