density() vs. KernSmooth::bkde
Thanks Prof. Ripley! Indeed the correct comparison is between density() and the more modern GenKern::KernSec() and in this case the difference is negligible, so I will use density() for my work. Thanks! mario
On 18-Jan-10 13:57, Prof Brian Ripley wrote:
On Mon, 18 Jan 2010, Mario Valle wrote:
Any advice when to use denstity() and when the KernSmooth package bkde() to smooth a histogram? No specific problem to use either one, but I'm curious why there are two so similar implementations.
They are fundamentally different. density() uses FFT: bkde() does not and is more flexible as a result Both use binning. There are only a limited number of ways to implement something as simple as KDE, and most of them have appeared in R/S-PLUS. Remember that KernSmooth was written for S-PLUS and predates R (at least in anything like its current form).
Thanks! mario -- Ing. Mario Valle Data Analysis and Visualization Group | http://www.cscs.ch/~mvalle Swiss National Supercomputing Centre (CSCS) | Tel: +41 (91) 610.82.60 v. Cantonale Galleria 2, 6928 Manno, Switzerland | Fax: +41 (91) 610.82.82
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Ing. Mario Valle Data Analysis and Visualization Group | http://www.cscs.ch/~mvalle Swiss National Supercomputing Centre (CSCS) | Tel: +41 (91) 610.82.60 v. Cantonale Galleria 2, 6928 Manno, Switzerland | Fax: +41 (91) 610.82.82