likfitBGCCM {geoR} | R Documentation

## Fits the bivariate Gaussian common component geostatistical model

### Description

Computes maximum likelihood estimates of the bivariate Gaussian common component geostatistical model.

### Usage

    likfitBGCCM(geodata1, geodata2, ini.sigmasq, ini.phi,
                cov0.model="matern", cov1.model="matern", cov2.model="matern",
                kappa0=0.5, kappa1=0.5, kappa2=0.5,
                fc.min = c("optim", "nlminb"), ...)

### Arguments

`geodata1` | an object of the class `geodata` with the data of the first variable.
`geodata2` | an object of the class `geodata` with the data of the first variable.
`ini.sigmasq` | optional, a vector with initial values for the correlation range parameters. If not provided default values are used.
`ini.phi` | optional, a vector with initial values for the correlation range parameters. If not provided default values are used.
`cov0.model, cov1.model, cov2.model` | covariance model for each of the processes. See `cov.spatial` for details.
`kappa0, kappa1, kappa2` | extra parameter for some covariance models.
`fc.min` | a string indication which function should be used to minimise the negative of the log-likelihood.
`...` | further arguments to be passed to `optim` or `nlminb`.

### Value

A list with model fitting information to which the class `BGCCM` is assigned.

`mu` | a 2 elements vector with mean estimates.
`sigmasq` | a 4 elements vector with variance estimates.
`phi` | a 3 elements vector with estimated correlation parameters values.
`loglik` | a scalar. Maximised value of the log-likelihood.
`optim` | results returned by `optim` or `nlminb`.
`...` | and other information related to the model fitting.

### Warning

This is a new function and still in draft format and pretty much untested.

### Author(s)

Paulo J. Ribeiro Jr. paulojus@leg.ufpr.br,
Peter J. Diggle p.diggle@lancaster.ac.uk.

### See Also

`optim`, `nlminb`, `varcovBGCCM`, `as.geodata`, `likfit`.

### Examples

    # see http://www.leg.ufpr.br/geoR/tutorials/CCM.R

[Package geoR version 1.6-19 Index]