Thank you Mr Gunter! I will look into it.
On Wed, Jan 9, 2013 at 11:59 AM, Bert Gunter <gunter.ber...@gene.com> wrote: > As this does not seem to have been answered... > > I believe you may misunderstand how loess works. The tricube weights > are part of the smoothing algorithm and change with each local fit, > not fixed weights for observations, which is what the "weights" > argument provides (and initially multiplies the tricube weight, IIRC). > > I suggest you consult > > ?predict.loess > > to get standard deviations of fitted values at existing or new points. > > -- Bert > > > > On Tue, Jan 8, 2013 at 12:57 AM, Joyce Lin <joyceli...@gmail.com> wrote: > > Hi > > > > I am trying to get the tricube weights from the loess outputs as I need > to > > calculate an error function which requires the weight. > > > > So I have used the following example from the R: > > > > cars.lo <- loess(dist ~ speed, cars, span=0.5, degree=1, > family="symmetric") > > > > Then i try to get the weights: > > > > cars.lo$weights > > [1] 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 > 1 1 > > 1 1 1 1 1 1 1 1 1 1 1 1 1 1 > > > > The results are all 1 so i dont think that the tricube weighting are set. > > May I know what other parameters do i need to tweak to set the weights to > > tricube weights? Thank you. > > > > > > -- > > Best regards > > Joyce Lin > > > > [[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. > > > > -- > > Bert Gunter > Genentech Nonclinical Biostatistics > > Internal Contact Info: > Phone: 467-7374 > Website: > > http://pharmadevelopment.roche.com/index/pdb/pdb-functional-groups/pdb-biostatistics/pdb-ncb-home.htm > -- Best regards Joyce Lin [[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.
