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ssthreeparlogistic
2006 Jun 09
0
interaction terms in regression analysis
...nimal (i.e. each dose response
curve represents an independent experiment).
The data are stored as follows:
expt treatA treatB dose force
I use a groupedData object mydata=groupedData(force ~ dose | expt)
I used an nlme obect to model the data as follows (pseudocode):
myfit <- nlme(force ~ ssThreeParLogistic(dose, upper, ed50,slope),
fixed=list(ed50~factor(treatmentA)*factor(treatmentC)))
The ThreeParLogistic is a properly debugged and fully functional
selfstarting object that I wrote- no problem here. I also included
terms for the other terms; upper and slope, but my main focus is on the
ed50...