[R-sig-Geo] weighting function

[Roger Bivand]

On Mon, 1 Jul 2013, Michael Blows wrote:

> Hi R sig geo community!
> does the current version of SPGWR use? wij = exp(-(d/h)^2) or wij = 
> exp(-0.5*(d/h)^2)as weighting function?
> Thanks,
> Mike

R 101? To see what the R code does, enter the name of the function at the 
prompt. The default weighting function is gwr.Gauss (see ?gwr), so:

> gwr.Gauss
function (dist2, bandwidth)
{
     w <- exp((-0.5) * ((dist2)/(bandwidth^2)))
     w
}

and ?gwr.Gauss says:

dist2: vector of squared distances between observations and fit point

Until 0.5, gwr.gauss was used, as the help page says; the current release 
is 0.6-21.

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Hope this clarifies,

Roger


>
>

-- 
Roger Bivand
Department of Economics, NHH Norwegian School of Economics,
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