On Wed, 17 Oct 2007, Jennifer Seavey wrote: > I am looking for R packages that create a moran's I correlogram with > ordinal data. my data format is x , y coordinates with a z values that > ranges between 0-4. another concern i have is that my sample size is 250 > and over 60% have a z value of 0. So i am concerned that the uneven > nature of the z values will show autocorrelation when it is simply a > matter that most of the data points have this value. Your advice/ > thoughts are appreciated. Thanks Jenn
Have you considered using join counts (joincount.multi() in spdep)? This avoids using the misleading metric in moran.test, but does not use the fact that a 3/4 join says more than a 0/4 join. This would have to be covered in the description of the output figure. Constructing weights lists for successive distance bands, it should be possible to plot a join count "correlogram". Roger > > _______________________________________________ > R-sig-Geo mailing list > R-sig-Geo@stat.math.ethz.ch > https://stat.ethz.ch/mailman/listinfo/r-sig-geo > -- 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