[S] BISQUARE WEIGHTS

[cs0sso@cis.sunderland.ac.uk (SOFIA Stephano)]

In order to fit a procedure to analyse the trend and the seasonal component 
of a time series, I need to use the bisquare weights, where, i.e., the 
robustness weights are formed by the bisquare weight function B:
B= ( 1-u^2 )^2 for 0 <= u < 1
B= 0 otherwise

I'm not able to find the right command in S-Plus4.
Did anybody use that before?
many thanks
Stefano

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