You could get answer quickly by searching net. https://stackoverflow.com/questions/39031172/how-poly-generates-orthogonal-p olynomials-how-to-understand-the-coefs-ret/39051154#39051154
Cheers Petr > -----Original Message----- > From: R-help <r-help-boun...@r-project.org> On Behalf Of Ashim Kapoor > Sent: Wednesday, November 27, 2019 12:55 PM > To: R Help <r-help@r-project.org> > Subject: [R] Orthogonal polynomials used by R > > Dear All, > > I have created a time trend by doing x<-1:93 because I have a time series > with 93 data points. Next I did :- > > y = lm(series ~ poly(x,4))$residuals > > to detrend series. > > I choose this 4 as the order of my polynomial using cross validation/ > checking the absence of trend in the residuals so I think I have not overfit > this series. > > I wish to document the formula of poly(x,4). I am not able to find it in ?poly > > Can someone please tell me what the formula for the orthogonal > polynomial used by R is ? > > Thank you, > Ashim > > [[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.
______________________________________________ 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.