match-making is such fun.
Farrar
Milton Cezar Ribeiro <[EMAIL PROTECTED]> 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 <[EMAIL PROTECTED]> 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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