 
  match-making is such fun.
   
  Farrar

Milton Cezar Ribeiro <milton_ruser@yahoo.com.br> wrote:
    I never used it, but I beleave that it is a job for "mantel.rtest()" available on "ade4" package.
   
  In fact Farrar are right, you will neet the XY coordinates. Give a look at "Legendre & Legendre" text book.
   
  HTH,
   
  Miltinho
  Brazil

David Farrar <dfarrar@newrvana.com> escreveu:
  

In addition to the 25 numbers, I assume you have coordinates of each field.
Otherwise, I don't understand what you are trying to do. I think ecologists like to use a test due to Mantel in this situation. 

The prefix "auto" means "self," of course, the idea being that measurements of the same variable under different conditions are correlated. I guess this would be a case of "autodependence." For correlation versus dependence, check your intro stats book. 

de nada, 
X'X 

Farrar 


Xu Yuan wrote:
hello R-friends,

I am a R beginner and try to ask a basic question:

How to test the spatial dependence of a column of data? for example, I have
25 agricultural fields, and I measure the average slope (%) or pH for each
field. All I have is 25 numbers.

PS, could someone confirm that "spatial dependence" is equivalent to
"spatial correlation" or "spatial autocorrelation" or not.

Thank you very much.
XY

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