search for: 282157

Displaying 1 result from an estimated 1 matches for "282157".

Did you mean: 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