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ds_cpl
2006 Jun 15
1
Repost: Estimation when interaction is present: How do I get get the parameters from nlme?
...h
The dataframe is structured like this:
expt treatA treatB dose force.
1 - - 0.1 20
1 - - 0.2 40
...
4 + + 0.1 20
4 +
I used a groupedData object: mydata=groupedData(force ~ dose | expt)
I used an nlme obect to model the data as follows (pseudocode):
myfit.nlme <- nlme(force ~ ss_tpl(dose, upper, ed50,slope),
fixed=list(ed50~factor(treatA)*factor(treatB)))
The function ss_tpl is a properly debugged and fully functional
selfstarting three parameter logistic function that I wrote- no problem
here. In my analysis
I also included fixed terms for the other fit parameters; upper...