[R] about strauss process

[Rolf Turner]

On 24/05/2009, at 3:29 PM, echo_july wrote:

>     i have trouble in using spatstat package.
>     i want to simulate a community under the Strauss process,which  
> has a parameter gamma that controls interaction strength between  
> points,and Strauss process is defined only for 0 ¡Ügamma ¡Ü 1 and  
> is a model for inhibition between points.
>     my problem is that in my data, many species's estimated gamma  
> is larger than one.so  if i still wanna simulate the point process  
> of that species with interaction between points,what can i do then?  
> is there other method i can use?


You might consider trying the Geyer process.  Use cif="geyer" in forming
the model to be used by rmh().  In fitting Geyer models to data, one way
to estimate the saturation parameter is via profile pseudolikelihood.
See ?profilepl.

	cheers,

		Rolf Turner
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