> It's possible that Martin's package, cobs, can do this, but not sure, > I haven't tried it. > And there may be other R packages for fitting splines/smoothers to > data, subject to shape constraints.
Further to my previous post. I read through the documentation for the cobs package. And (someone please correct me if I'm wrong) I don't think it can produce a smoother with an S-shaped shape constraint. I found two other packages for smoothing under shape constraints, but doesn't look like they can either. I have code that could be adapted for this purpose. But one it's incomplete, two it (currently) requires the user to specify a smoothness parameter, and three doesn't produce any kind of inference... ______________________________________________ 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.
