sar | R Documentation |
Set up an spatial simultaneous autoregressive (SAR) term in brms. The function does not evaluate its arguments – it exists purely to help set up a model with SAR terms.
sar(M, type = "lag")
M |
An object specifying the spatial weighting matrix.
Can be either the spatial weight matrix itself or an
object of class |
type |
Type of the SAR structure. Either |
The lagsar
structure implements SAR of the response values:
y = \rho W y + \eta + e
The errorsar
structure implements SAR of the residuals:
y = \eta + u, u = \rho W u + e
In the above equations, \eta
is the predictor term and e
are
independent normally or t-distributed residuals. Currently, only families
gaussian
and student
support SAR structures.
An object of class 'sar_term'
, which is a list
of arguments to be interpreted by the formula
parsing functions of brms.
autocor-terms
## Not run:
data(oldcol, package = "spdep")
fit1 <- brm(CRIME ~ INC + HOVAL + sar(COL.nb, type = "lag"),
data = COL.OLD, data2 = list(COL.nb = COL.nb),
chains = 2, cores = 2)
summary(fit1)
plot(fit1)
fit2 <- brm(CRIME ~ INC + HOVAL + sar(COL.nb, type = "error"),
data = COL.OLD, data2 = list(COL.nb = COL.nb),
chains = 2, cores = 2)
summary(fit2)
plot(fit2)
## End(Not run)
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