lag.listw: Spatial lag of a numeric vector
In spdep: Spatial Dependence: Weighting Schemes, Statistics and Models

Description Usage Arguments Value Author(s) See Also Examples

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

1 2	## S3 method for class 'listw' lag(x, var, zero.policy=NULL, NAOK=FALSE, ...)

`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 NULL, 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

a numeric vector the same length as var

Roger Bivand Roger.Bivand@nhh.no

nb2listw

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)

Loading required package: sp
Loading required package: Matrix
Warning message:
In lag.listw(nb2listw(COL.nb, style = "W"), COL.OLD$CRIME, NAOK = TRUE) :
  NAs in lagged values