[R] derivatives from loess (not locpoly)?
Prof Brian Ripley
ripley at stats.ox.ac.uk
Sun May 18 09:11:57 CEST 2003
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 at 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
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