[R] derivatives from loess (not locpoly)?

[Prof Brian Ripley]

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)
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