[R] j and jcross queries

[Robert Biddle]

Hi:

I have a query related to the J and Jcross functions in the SpatStat 
package.

I use J to finding indications of clustering in my data, and Jcross
to look for dependence between point patterns.

I use the envelope function to do Monte Carlo tests to look for 
significance.

So far so good.

My question is how I can test to see if tests are significantly different.

For example, if find J of pattern X and J of pattern Y, how could I 
determine
the liklihood that those results come from different processes?

Similarly, if I find J of marks X and Y, and X and Z, how could I 
determine the liklihood
that Y and Z come from different processes?

I would appreciate advice.

Cheers

Robert Biddle