hm567 wrote: > > I am unsure about spar being the smoothness parameter, about where to put > the standard errors of the points, and about the return of the > smooth.spline function:
> Smoothing Parameter spar= 0.5 lambda= 0.006833112 > > best regards, > Basically, the implementation based on the attached paper, for a standard error of points =1.0, the smoothing is too insensitive to the lambda smoothness parameter. >From 1 to almost 0.01, there is almost no smoothing... Only from 0.01 to 0 does one start to see smoothing in action with the limit at 0 being a straight line. Note that this implementation's parameter is (1 - parameter) With R smooth.spline, 'spar' reflects well the smoothness in that: . at 0%, the spline interpolates . at 40% already, its shape is very different from the 0% one ( for my implementation, they are still same ) . at 90% it is almost a straight line . at 100% it is definitely a straight line This is the behavior that I wish to have. It seems I need to change my lambda with some transformation that is similar to the one in the doc of smooth.spline (spar to lambda). Perhaps the reverse one. But I can't see how to do it. The other question is the standard errors. What do they correspond to in the doc of smooth.spline? Regards, -- View this message in context: http://www.nabble.com/basic-cubic-spline-smoothing-tp25569553p25609558.html Sent from the R help mailing list archive at Nabble.com. [[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.
