Hello Dan,
   
  There are multiple ways to treat the spatially autocorrelated data. Rather 
than suggesting a single solution, I would like to point out the below book, 
which I found very useful. 
   
  Statistical methods for spatial data analysis by Oiver Schabenberger and 
Carol Gotway. 2005. Chapman and Hall.
   
  Ofcourse, spatial statistics by Noel Cressie (1993) - Statistics for spatial 
Data, is a classic reference.

Krishna

"Daniel C. McEwen" <[EMAIL PROTECTED]> wrote:
  I am developing models of benthic invertebrate abundance but am uncertain
of the best way to treat the spatial data. I have lat, long, and depth. 
I thought about detrending, but then wouldn't I have to double detrend
(first with respect to lat and long and second with depth)? 
Alternatively, would it make sense to just include the interaction of lat,
long, and depth in the model as a covariable?

Thanks,

Dan



                Dr. Krishna Prasad Vadrevu  Research Scientist  201 Thorne 
Hall, Agroecosystem Management Program  1680 Madison Avenue, The Ohio State 
University  Wooster, OHIO, 44691-4096, USA  Fax : 330-263-3686  Phone : 
330-202-3539  Email : [EMAIL PROTECTED]








                
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