Hi All,

I have what I imagine is a fairly basic question, but I am a relative beginner at using spatial data in my analyses.  I am trying to address spatial autocorrelation in my data which examines lizard morphology across a broad geographic range.  My spatial data is in the form of decimal long/lat and I am trying to select which variogram model to use.

My question is, what is the form of the correlation structure within each of the corClasses for decimal lat/long data.  In other words, what goes after "form" in the following example script:

exp.cybotes<-update(null.model, correlation =corExp(1, form = ???), method= "ML")

I apologize for the basic question but I am stuck!

Thanks,
Gabriel


Gabriel E.A. Gartner
Postdoctoral Fellow
Museum of Comparative Zoology 
Harvard University
26 Oxford St.
Cambridge, MA 02138
Office: 617-384-8437
http://www.oeb.harvard.edu/faculty/losos/Gartner/index_2.html




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