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ft_rc
2008 Dec 01
1
explaining a model with rcs() terms
...it object.
Here is how the model was fit:
fit.ols <- ols( log(k) ~ (rcs(activity) * (log(conc) + sar)) +
(rcs(sand) * (log(conc) + sar)), data=sm.clean, x=TRUE, y=TRUE)
Here is how I am accessing the 'expanded' format of the model structure:
options(digits=3)
latex(fit.ols, file='fit_rcs.tex')
The output contains several notation elements that I am not familiar with:
1. x_{+} --> it seems that this represent a term that should be set
to 0, when x is 0?
i.e. the entire expression ?453(activity ? 0.842)_{+}^{3} = 0 when
'activity' = 0 ??
2. the '!x' fo...