On Tue, 16 May 2006, Stuart Leask wrote: > I wish to reproduce a locally-weighted fit from (old-fashioned) lowess with > (new-fangled) loess.
`new-fangled': from 1991! (That is, well before R.) > Although ?lowess advises that loess has different defaults, does anyone know > how to set up loess so it does exactly the same as lowess did? It is not possible: the algorithms differ considerably in their details. > Fiddling about suggests setting loess(x, span = 0.8, degree=1) is fairly > close for my data - but clearly not the same. You want family="symmetric" as well. In determining 'local' loess() uses a tricubic weighting, lowess() uses a uniform weighting (on reading the code). > (I can't help feeling that with something basic like this, I've probably > been unlucky in my archive/help searches so far.) Did you look at the references on the help pages? I think that is the only place you are likely to find this explained in detail. -- 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 ______________________________________________ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html