Hello Group.
Regarding degrees of freedom in GAM models fit by mgcv, I do understand the
estimated df, but what does "ref.df" in the summary output mean?
I didn't see an explanation in Wood (2017) or find it in the function
code. The answer may be on page 222 of
Wood SN. On p-values for smooth components of an extended generalized
additive model. Biometrika 2013;100(1):221-228
or thereafter, but I am not a statistician. I could use help understanding
what the reference degrees of freedom are.
Thank you,
Susan
--
Susan Elias
Vector-borne Disease Lab, Maine Medical Center Research Institute
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