[R-sig-Geo] question about nb2listw row standardization
Roger.Bivand at nhh.no
Tue Aug 4 21:53:00 CEST 2015
On Tue, 4 Aug 2015, Mueller,Drew wrote:
> I was hoping for a clarification on the row standardization of nb2listw.
> I have implemented a nb list based on distance, and a function
> dlist <- nbdists(col.gal.nb, coords)
> dlist <- lapply(dlist, function(x) 1/x)
> my question is, if I call
> Wa <- nb2listw(x, glist = dlist, style = "W")
> Wb <- nb2listw(x, glist = dlist, stlye = "B")
> is Wa then row standardized based on inverse distance or does the glist
> override this and I get actual undstandardized inverse distance weights?
> Also, would Wb actually be binary, or does the glist argument override
> this to make the weights 1/x instead of 1's and 0's? If my goal is to
> maintain the actual inverse distance weight without standardization (for
> better economic interpretation), does Wb give me an unstandardized W, or
> do I need to call a different function to avoid row standardization?
> If my goal IS to row standardize a weights matrix with weights based on
> inverse distance, then is Wa the correct function call? Mainly I was
> having trouble interpreting the help file for nb2listw as to whether
> style = "B" always creates 1's and 0's regardless of what glist is set
> to. Thanks
Please do check:
coords <- coordinates(columbus)
dlist <- nbdists(col.gal.nb, coords)
dlist <- lapply(dlist, function(x) 1/x)
Wa <- nb2listw(col.gal.nb, glist = dlist, style = "W")
Wb <- nb2listw(col.gal.nb, glist = dlist, style = "B")
"W" row standardises the general weights, "B" passes through general
weights. IDW are perverse, and without - contrary to your assertion -
economic meaning, because the scaling depends closely on the metric of
are all < 1.
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