adjacency.matrix        Return an adjacency matrix for a square
                        lattice.
copCAR                  Fit copCAR model to discrete areal data.
negbinomial             Family function for negative binomial GLMs.
rcopCAR                 Simulate areal data.
residuals.copCAR        Extract model residuals.
summary.copCAR          Print a summary of a copCAR model fit.
vcov.copCAR             Return the estimated covariance matrix for a
                        'copCAR' model object.
