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See Marazzi A. (1993), p.67
riclls(xt, y, k = np, ix = .dFvGet()$ix1, iy = .dFvGet()$iy1, sf, sg, sh, ip)
See reference
Marazzi A. (1993) Algorithm, Routines, and S functions for Robust Statistics. Wadsworth & Brooks/cole, Pacific Grove, California. p.67