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

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