R: Creates the inverse covariance matrix for an intrinsic...

icar.Q {stocc}

R Documentation

Creates the inverse covariance matrix for an intrinsic conditionally autoregressive spatial model.

This function creates the ICAR precision matrices used in the spatial models

icar.Q(xy, threshold, rho = 1, fun = FALSE)

`xy`	An n x 2 matrix of spatial coordinates
`threshold`	Distance threshold for neighborhood definition
`rho`	The autoregressive parameter. Defaults to 1, which is the Intrinsic Conditionally AutoRegressive model (ICAR)
`fun`	If `TRUE` this function returns a function of rho that generates the precision matrix of a ICAR process

Constructs the inverse covariance matrix (aside from scaling) for the ICAR model

An n x n matrix

Devin S. Johnson <devin.johnson@noaa.gov>

[Package stocc version 1.31 Index]