psi.tukey {rmargint}R Documentation

Derivative of Tukey's bi-square loss function.

Description

This function evaluates the first derivative of Tukey's bi-square loss function.

Usage

psi.tukey(r, k = 4.685)

Arguments

r

A vector of real numbers

k

A positive tuning constant.

Details

This function evaluates the first derivative of Tukey's bi-square loss function.

Value

A vector of the same length as r.

Author(s)

Matias Salibian-Barrera, matias@stat.ubc.ca, Alejandra Martinez

Examples

x <- seq(-2, 2, length=10)
psi.tukey(r=x, k = 1.5)


[Package rmargint version 2.0.3 Index]