an object of class ("formula") specifying the linear trends of the adjustment coefficients. This formula should concern only the input variables, and not the output (response). If there is any, it is automatically dropped. The default is ~1, which defines a constant trend.
Z
a vector (or 1-column matrix or data frame) containing the values of the 1-dimensional output given by the function of level k at the design points of level k-1.
formula
see km
design
see km
response
see km
covtype
see km
coef.trend
see km
coef.cov
see km
coef.var
see km
estim.method
see km
nugget
see km
nugget.estim
see km
noise.var
see km
penalty
see km
optim.method
see km
lower
see km
upper
see km
parinit
see km
control
see km
gr
see km
iso
see km
scaling
see km
knots
see km
Value
An object with S4 class "kmCok" (see kmCok-class).
Author(s)
Olivier Roustant, David Ginsbourger, Ecole des Mines de St-Etienne.
Loic Le Gratiet, Universite Paris VII Denis-Diderot
References
KRIGE, D.G. (1951), A statistical approach to some basic mine valuation problems on the witwatersrand, J. of the Chem., Metal. and Mining Soc. of South Africa, 52 no. 6, 119-139.
MATHERON, G. (1969), Le krigeage universel, Les Cahiers du Centre de Morphologie Mathematique de Fontainebleau, 1.