Spatial lag of a numeric vector
Using a listw sparse representation of a spatial weights matrix, compute the lag vector V x
## S3 method for class 'listw' lag(x, var, zero.policy=NULL, NAOK=FALSE, ...)
x |
a |
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
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)
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