I want to do "moran's I test" in R language. I try to use "gearymoran" in
Package "ade4","moran" in Package "spdep", and Moran.I in Package "ape". But
I do not know how to do it because data format is different.

My data:

   x        y       dbh

111.03    10.7       7

118.11    0.28     1.2

165.36    0.36     8.4

  282.9     0.3     7.5

303.29   13.32    12.2

319.28    3.88     6.2

    447       9       6

  445.5    18.3    13.8

  445.5    12.1     7.1

467.64     1.2     4.7

  485.4    14.1     4.4

   2.98   23.95    11.7

     15   35.78    23.5

130.21    23.6    14.1

  213.5   23.22    21.5

233.57   28.76    35.4

  482.3    20.5       6

  69.73   45.21     7.5

   69.8   50.49    10.2

  76.65    45.5    21.5



"x","y" are spatial coordinate;

"dbh" is variable

I want to test the spatial autocorrelation of "dbh" in different distances
by "x" and "y".



Thanks,

                               Jian Zhang

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