psi.tukey | R Documentation |
This function evaluates the first derivative of Tukey's bi-square loss function.
psi.tukey(r, k = 4.685)
r |
a vector of real numbers |
k |
a positive tuning constant. |
This function evaluates the first derivative of Tukey's bi-square loss function.
A vector of the same length as x
.
Matias Salibian-Barrera, matias@stat.ubc.ca, Alejandra Martinez
x <- seq(-2, 2, length=10)
psi.tukey(r=x, k = 1.5)
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