Re: [R] derivatives from loess (not locpoly)?

About this list Date view Thread view Subject view Author view Attachment view

From: Prof Brian Ripley (ripley@stats.ox.ac.uk)
Date: Sun 18 May 2003 - 17:11:57 EST


Message-id: <Pine.LNX.4.44.0305180808150.16083-100000@gannet.stats>

Not easily. Unlike locpoly (in KernSmooth, uncredited), loess uses a
locally varying bandwidth and that would need to be taken into account in
determining the derivative. The underlying Fortran code does not have any
support for this.

On Sat, 17 May 2003, J S wrote:

> is there a way of estimating derivative curves, similar to the ones we
> get from 'locpoly', from 'loess' estimation.

> i am interested in estimation of 1st and 2nd derivatives...

-- 
Brian D. Ripley,                  ripley@stats.ox.ac.uk
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://www.stat.math.ethz.ch/mailman/listinfo/r-help


About this list Date view Thread view Subject view Author view Attachment view

This archive was generated by hypermail 2.1.3 : Tue 01 Jul 2003 - 09:11:50 EST