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
moran's I correlogram
3 messages · Jennifer Seavey, Roger Bivand, Agustin Lobo
1 day later
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
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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: Roger.Bivand at nhh.no
Jeniffer, Lance Waller provides some code: http://www.sph.emory.edu/~lwaller/ch7index.htm Not sure if it would fit your particular requirement, though. Agus Jennifer Seavey escribi?:
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
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Dr. Agustin Lobo Institut de Ciencies de la Terra "Jaume Almera" (CSIC) LLuis Sole Sabaris s/n 08028 Barcelona Spain Tel. 34 934095410 Fax. 34 934110012 email: Agustin.Lobo at ija.csic.es http://www.ija.csic.es/gt/obster