Boundaries for covariance parameters
Default boundaries for covariance parameters.
covParametersBounds(object, X)
object |
an object specifying the covariance structure. |
X |
a matrix representing the design of experiments. |
The default values are chosen as follows :
| Range parameters (all covariances) | lower=1e-10, upper=2 times the difference between |
the max. and min. values of X for each coordinate |
|
Shape parameters (powexp covariance) |
lower=1e-10, upper=2 for each coordinate
|
a list with items lower, upper containing default boundaries for the covariance parameters.
Olivier Roustant, David Ginsbourger, Ecole des Mines de St-Etienne.
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