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lithology
2009 Apr 30
0
Categorical variable in a custom nonlin function with gnm
...ese dummy variables, and doesn't estimate the parameters.
It works if I put the dummy variables into a linear model using gnm, like so:
(where LithologyB is a series of ones and zeros, representing the occurrence of Lithology B, etc.)
> summary(gnm(response~LithologyB+LithologyC+LithologyD+LithologyE+LithologyF, family=binomial))
Linear predictor - using glm.fit
Call:
gnm(formula = response ~ LithologyB + LithologyC + LithologyD + LithologyE + LithologyF, family = binomial)
Deviance Residuals:
Min 1Q Median 3Q Max
-17.676 -8.433 -1.181 7.825 23.415
Co...