I have read the gam() function in mgcv package, and find that it's inappropriate for the additive model. So i didn't go further. I may have solved it if i can search more info on gam. Thanks a lot anyway, it has been solved with your help.
On 9/18/07, Prof Brian Ripley <[EMAIL PROTECTED]> wrote: > > On Mon, 17 Sep 2007, Charles Annis, P.E. wrote: > > > ?loess > > packages gam and mgcv both provide gam() functions in R: package gam is > very close to the S(-PLUS) implementation and would fit the model given > (in so far as we can tell from a non-reproducible example). > > loess will allow a general smooth function of 2 arguments, but not > (directly) an additive model. Having said that, I would be suspicious of > an additive model of two rather artificial variables such as latitude and > longitude (unless the scale is large the angle of the earth's axis is > usually of very minor importance), so a 2D loess fit might well be more > informative. > > > Charles Annis, P.E. > > > > [EMAIL PROTECTED] > > phone: 561-352-9699 > > eFax: 614-455-3265 > > http://www.StatisticalEngineering.com > > > > > > -----Original Message----- > > From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] > On > > Behalf Of zhijie zhang > > Sent: Monday, September 17, 2007 1:19 PM > > To: [EMAIL PROTECTED] > > Subject: [R] What's the corresponding function in R for lo() function > > inS-PLUS? > > > > Dear friends, > > In S-PLUS, we can use the following argument, but not in R. > > mode12 <- gam(score1 ~ lo(latitude) + lo(longitude)) > > I searched the help in S-PLUS, it says lo() Allows the user to specify a > > Loess fit in a GAM formula, but i didn't find the correponding function > in > > R. > > Anybody knows how to do the similar task in R? > > Thanks very much. > > > > > > -- > Brian D. Ripley, [EMAIL PROTECTED] > Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/ > University of Oxford, Tel: +44 1865 272861 (self) > 1 South Parks Road, +44 1865 272866 (PA) > Oxford OX1 3TG, UK Fax: +44 1865 272595 > -- With Kind Regards, oooO::::::::: (..)::::::::: :\.(:::Oooo:: ::\_)::(..):: :::::::)./::: ::::::(_/:::: ::::::::::::: [***********************************************************************] Zhi Jie,Zhang ,PHD Tel:86-21-54237149 Dept. of Epidemiology,School of Public Health,Fudan University Address:No. 138 Yi Xue Yuan Road,Shanghai,China Postcode:200032 Email:[EMAIL PROTECTED] Website: www.statABC.com [***********************************************************************] oooO::::::::: (..)::::::::: :\.(:::Oooo:: ::\_)::(..):: :::::::)./::: ::::::(_/:::: ::::::::::::: [[alternative HTML version deleted]] ______________________________________________ R-help@r-project.org mailing list 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.
