[R-sig-eco] construct a nearest neighbor contingency table

[Marcelino de la Cruz]

Hello,

You can use the function "dixon2002" in the R package "ecespa". It 
only requires  a data.frame with x, y and "type"  columns as input.

Please, tell me how does it work for you.

Regards,


Marcelino



At 01:28 04/06/2008, Tom Elliott wrote:
>Hello-
>
>I have plot data of  mapped male and female cottonwoods, collected for
>my master's thesis. The data are multiple rows in 3 columns:
>x-coordinate, y-coordinate, and a code for male, female, or unknown. I
>want to test it for spatial segregation of the sexes using methods by
>Phillip Dixon (1994, 2002).
>
>  Is there a way in R to build a nearest neighbor contingency table for
>the data? I would like the format to be 3 rows (male, female,
>unknown), with columns for counts of the nearest neighbors in each
>class.
>
>Thanks,
>Tom
>
>Biology Department
>Central Washington University
>
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>R-sig-ecology mailing list
>R-sig-ecology at r-project.org
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***************************************
Marcelino de la Cruz Rot
Depto. Biologia Vegetal
EUIT Agricola
Universidad Politecnica de Madrid
28040-Madrid
SPAIN