Q.AR1                   Precision matrix for an AR1 process
Q.iid                   Precision matrix for a IID process
Q.lCAR                  Precision matrix for a pCAR process
Q.mBYM                  Modified Precision matrix for a BYM process
Q.pCAR                  Precision matrix for a pCAR process
US.df                   Spatial Polygons Data Frame of Counties for
                        Several States
US.graph                Matrix of Shared Boundaries Between US.df
                        Counties
sim.AR                  Simulate correlated data from a precision
                        matrix.
