Displaying 1 result from an estimated 1 matches for "mygam3".
2006 Mar 16
3
Did I use "step" function correctly? (Is R's step() function reliable?)
...Step: AIC= 153.45
col1 ~ col2 + col3 + col4 + s(col2, 3) + s(col3, 3)
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However, the lowest AIC model, " col1 ~ col2 + col3 + col4 + s(col2, 3) +
s(col3, 3) + s(col4, 3)" does not give the best Residual Deviance.
Instead, the model "mygam3=gam(col1 ~ s(col2, 6) + s(col3, 6) + s(col4, 6),
data=X)" is the best, in fact,
I found that as I increase the "degree-of-freedom", it always give better
residual deviance, lower than that of the "best" model returned by "step"
function... Please see below.
I am...