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(x, var, zero.policy=FALSE, 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` | 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 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)
    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)

[Package spdep version 0.4-56 Index]