km1Nugget.init is used to give good initial values to fit kriging models when there is an unknown nugget effect to be estimated.
an object of class
a matrix whose rows contain initial vectors of parameters.
a vector containing the function values corresponding to
a list containing the covariance objects corresponding to
vectors containing lower and upper bounds for parameters.
The procedure can be summarized in 4 stages :
|1)|| Compute the variogram and deduce a first estimation of the total variance. If an initial value is provided for
|2)|| Simulate several values for the nugget effect and the process variance, around the estimations obtained at stage 1). The number of simulations is the one given in
|3)|| If no initial value is provided for the other covariance parameters, simulate them uniformly inside the domain delimited by