lag.listw {spdep}R Documentation

Spatial lag of a numeric vector

Description

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

Usage

lag.listw(listw, x, zero.policy=FALSE)

Arguments

listw a listw object created for example by nb2listw
x a numeric vector the same length as the neighbours list in listw
zero.policy if TRUE assign zero to the lagged value of zones without neighbours, if FALSE assign NA

Value

a numeric vector the same length as x

Author(s)

Roger Bivand Roger.Bivand@nhh.no

See Also

nb2listw

Examples

data(oldcol)
Vx <- lag.listw(nb2listw(COL.nb, style="W"), COL.OLD$CRIME)
plot(Vx, COL.OLD$CRIME)
require(stepfun)
plot(ecdf(COL.OLD$CRIME))
plot(ecdf(Vx), add=TRUE, col.points="red", col.hor="red")

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