psi' weight function for location and regression

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Description

See Marazzi A. (1993), p.320

Usage

1
Psp(svals)

Arguments

svals

A vector of input values

Value

The values of the psi' weight function for each element of svals

References

Marazzi A. (1993) Algorithm, Routines, and S functions for Robust Statistics. Wadsworth & Brooks/cole, Pacific Grove, California. p.320

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