Thank you very much for you kind advice.
--- Roger Bivand <[EMAIL PROTECTED]> wrote: > On Thu, 28 Sep 2006, Hisaji ONO wrote: > > > Hello. > > > > In some "geo-spatial analysis" text books & > articles, > > "boundary effect" was referred. > > > > For spatial weight matrix and its related > statistical > > methods, this issue is very important, I think. > > > > For this issue, I've looked for this in "spdep" > and > > "spgwr" in their "manual" pdf files, but no luck. > > > > Current version of these packages consider > "boundary > > effect"? > > > > Yes, you are right that boundary (or edge) effects > can be important. They > concern the extent to which inferences may change if > we change the edges > of the study area, and/or the configuration effect > that occurs when some > observations are fully surrounded (in the centre of > the study area) and > others are on the edge. > > There is an indirect reference to this in the > joincount.test() example in > spdep - it uses different settings of the spatial > weights style= argument > to show how weights configuration can change > inference. So in spdep, the > only treatment is through the style= argument. > > In spgwr, fitting adaptive bandwidths seems to be > one way of preventing > observations far from their neighbours being > impacted by a single global > distance bandwidth. The GWR book doesn't have edge > effects in its index. > > Best wishes, > > Roger > > > > > > > Regards. > > > > > > > > > > > > > > > > -- > Roger Bivand > Economic Geography Section, Department of Economics, > Norwegian School of > Economics and Business Administration, Helleveien > 30, N-5045 Bergen, > Norway. voice: +47 55 95 93 55; fax +47 55 95 95 43 > e-mail: [EMAIL PROTECTED] > > _______________________________________________ R-sig-Geo mailing list R-sig-Geo@stat.math.ethz.ch https://stat.ethz.ch/mailman/listinfo/r-sig-geo
