[R] model fitting using by(): how to get fitted values?
xavier.chardon at free.fr
xavier.chardon at free.fr
Wed May 6 14:22:13 CEST 2009
Hi all,
I'm doing nonlinear regressions on data with several factors. I want to fit say a logistic curve with different parameter values for each factor level. So I'm doing something like:
tmp <- by( myData, list(myFactor1, myFactor2), function(x) nls(...) )
It works fine. However, I could not find an easy way to retrieve fitted values. I can use fitted() on each element of tmp, but that gives me as many vectors as there are combinations of factor levels.
I was thinking of using by() again, but I can't figure out how to write it properly.
Any ideas?
Thanks a lot,
Xavier
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