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2003 Nov 25
1
problem plotting curve through data
I'm having trouble plotting a curve (basically a dose-response function) through a set of data. I have created a dataframe (df) of Stimulus Intensities (xstim) and Normalized Responses (yresp), and I've used nls() to calculate a nonlinear regression, like so: -------------------- > f <- yresp ~ xstim^n / (xstim^n + B^n) > starts <- list(n=.6, B=11) > myfit <- nls(formula=f, data=df, start = starts) >myfit Nonlinear regression...