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222157
2004 Mar 17
0
NLS question:Quadratic plus plateau fit
Dear R colleagues:
Am trying to fit a simple NL model to determine Economical Optimum Nitrogen
Rates.
The segmented (quadratic + plateau) model only works with some y's, in some
cases I get a "singular gradient" error.
I'll appreciate any ideas in how to solve the singular gradient error.
Thanks,
Jose
# The following code works using yield2 in the nls model but not using