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b11
2006 Apr 10
3
SE estimates for treatment groups from nlme
I am wondering how to obtain SE estimates for fixed effects from a nonlinear mixed effects model?
I have fixed effects corresponding to three factors A, B and C with 2, 3 and 3 levels respectively. I have fit a model of the following general form:
nlme1<-nlme(y~ SasympOrig(x, Asym, lrc), data=df, fixed=list(Asym~A*B*C, lrc~A*B*C),
start=c(fixef(ETR.nlme)[1], rep(0,17), fixef(ETR.nlme)[2],