lag.listw: Spatial lag of a numeric vector

In spdep: Spatial Dependence: Weighting Schemes, Statistics

Spatial lag of a numeric vector

Description

Using a listw sparse representation of a spatial weights matrix, compute the lag vector V x

Usage

## S3 method for class 'listw'
lag(x, var, zero.policy=attr(listw, "zero.policy"), NAOK=FALSE, ...)

Arguments

x	a listw object created for example by nb2listw
var	a numeric vector the same length as the neighbours list in listw
zero.policy	default attr(listw, "zero.policy") as set when listw was created, if attribute not set, use global option value; if TRUE assign zero to the lagged value of zones without neighbours, if FALSE assign NA
NAOK	If 'FALSE', the presence of 'NA' values is regarded as an error; if 'TRUE' then any 'NA' or 'NaN' or 'Inf' values in var are represented as an NA lagged value.
...	additional arguments

Value

a numeric vector the same length as var

Author(s)

Roger Bivand [e-mail]

See Also

nb2listw

Examples

data(oldcol)
Vx <- lag.listw(nb2listw(COL.nb, style="W"), COL.OLD$CRIME)
plot(Vx, COL.OLD$CRIME)
plot(ecdf(COL.OLD$CRIME))
plot(ecdf(Vx), add=TRUE, col.points="red", col.hor="red")
is.na(COL.OLD$CRIME[5]) <- TRUE
VxNA <- lag.listw(nb2listw(COL.nb, style="W"), COL.OLD$CRIME, NAOK=TRUE)

spdep documentation built on Sept. 13, 2024, 5:07 p.m.