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bacarella
2011 Oct 11
1
singular gradient error in nls
I am trying to fit a nonlinear regression to infiltration data in order to
determine saturated hydraulic conductivity and matric pressure. The
original equation can be found in Bagarello et al. 2004 SSSAJ (green-ampt
equation for falling head including gravity). I am also VERY new to R and
to nonlinear regressions. I have searched the posts, but am still unable to
determine why my data come up with the "singular gradient" error.
Here are the data:
time <- c(1, 2, 3,...