# SCAD.derivative

From DiceKriging v1.5.6
by Olivier Roustant

##### Penalty function derivative

Derivative of SCAD function.

##### Usage

`SCAD.derivative(x, lambda)`

##### Arguments

- x
a vector where the function is to be evaluated.

- lambda
a number representing a tuning parameter.

##### Value

A vector containing the SCAD derivative values at `x`

.

##### References

R. Li and A. Sudjianto (2005), Analysis of Computer Experiments Using Penalized Likelihood in Gaussian Kriging Models, *Technometrics*, **47** no. 2, 111-120.

##### See Also

*Documentation reproduced from package DiceKriging, version 1.5.6, License: GPL-2 | GPL-3*

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