A vector containing the SCAD derivative values at x.
Arguments
x
a vector where the function is to be evaluated.
lambda
a number representing a tuning parameter.
Author
O. Roustant, D. Ginsbourger, Ecole des Mines de St-Etienne.
References
R. Li and A. Sudjianto (2005), Analysis of Computer Experiments Using Penalized Likelihood in Gaussian Kriging Models, Technometrics, 47 no. 2, 111-120.