u' weight function for covariances
See Marazzi A. (1993), p.325
Upcv(svals)
svals |
A vector of input values |
The values of the u function for each element of svals
Marazzi A. (1993) Algorithm, Routines, and S functions for Robust Statistics. Wadsworth & Brooks/cole, Pacific Grove, California. p.325
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