R help - Oct 2012 - 4253H twice implementation

Dear All,

Anybody know if *4253H twice filter* is implemented in R?

*Description of filter:* Applies a series of running medians of varying
window size and a weighted average filter, with re-roughing, to the NDVI
time series
*Reference*: Velleman, P. (1980). Definition and comparison of robust
nonlinear data smoothing algorithms. Journal of the American Statistical
Association..

Thanks
Julio

	[[alternative HTML version deleted]]

Have a look at

library(sos)
findFn("twice filter")


ir. Thierry Onkelinx
Instituut voor natuur- en bosonderzoek / Research Institute for Nature and
Forest
team Biometrie & Kwaliteitszorg / team Biometrics & Quality Assurance
Kliniekstraat 25
1070 Anderlecht
Belgium
+ 32 2 525 02 51
+ 32 54 43 61 85
Thierry.Onkelinx at inbo.be
www.inbo.be

To call in the statistician after the experiment is done may be no more than
asking him to perform a post-mortem examination: he may be able to say what the
experiment died of.
~ Sir Ronald Aylmer Fisher

The plural of anecdote is not data.
~ Roger Brinner

The combination of some data and an aching desire for an answer does not ensure
that a reasonable answer can be extracted from a given body of data.
~ John Tukey

-----Oorspronkelijk bericht-----
Van: r-help-bounces at r-project.org [mailto:r-help-bounces at r-project.org]
Namens julio cesar oliveira
Verzonden: maandag 22 oktober 2012 12:39
Aan: r-help at r-project.org
Onderwerp: [R] 4253H twice implementation

Dear All,

Anybody know if *4253H twice filter* is implemented in R?

*Description of filter:* Applies a series of running medians of varying window
size and a weighted average filter, with re-roughing, to the NDVI time series
*Reference*: Velleman, P. (1980). Definition and comparison of robust nonlinear
data smoothing algorithms. Journal of the American Statistical Association..

Thanks
Julio

        [[alternative HTML version deleted]]

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