Thank you, Dr. Wood, that is very helpful. Best,
Susan On Wed, Mar 27, 2019 at 12:10 PM Simon Wood <simon.w...@bath.edu> wrote: > These are a bit of a throwback really, and are not very useful - they > are reference degrees of freedom used in computing test statistic and > the p-values, but since the null distributions are non-standard the > reference DoF is not very interpretable. > > best, > > Simon > > On 27/03/2019 13:58, Susan Elias wrote: > > 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 > > > > > > > > > -- > Simon Wood, School of Mathematics, University of Bristol, BS8 1TW UK > https://people.maths.bris.ac.uk/~sw15190/ > > ______________________________________________ > R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide > http://www.R-project.org/posting-guide.html > and provide commented, minimal, self-contained, reproducible code. > -- Susan Elias PhD Candidate, School of Earth and Climate Sciences, University of Maine Research Associate, Vector-borne Disease Lab, Maine Medical Center Research Institute 207-756-2761 [[alternative HTML version deleted]] ______________________________________________ R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
