R help - May 2009 - about strauss process

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?


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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 ??gamma ?? 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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