Dear Christian,

Thank you for your article. My problem mainly concerns on the fact  
that the aggregation between the two type of events are an induced  
consequence by first order effects which affects both the types of  
point at the same time. I thought using a random labeling null  
hypothesis (such in the ads package) might work out, but the  
assumption in that case will take over "more" than the first order  
effect. What I am, really trying to do is to manipulate the workflow  
in the creation of the confidence envelope by forcing the simulated  
points to follow the first order trend which is observed as a joint  
effect of the two points. Technically if this involves the simple  
alteration of the code that will be fine, but I was wondering there  
are any mathematical implications in this.

Enrico
---------------------------------------
Enrico R. Crema
PhD Candidate
Institute of Archaeology, UCL
AHRC Centre for the Evolution of Cultural Diversity
  +44 7899093191
http://www.cecd.ucl.ac.uk/people/?go1=91
e.crema@ucl.ac.uk
enrico.crema@gmail.com






On 16 Sep 2009, at 14:32, Christian E. Salas Eljatib wrote:

> hi enrico
> please, see attached pdf article applying the bivariate version of  
> the K function in forest ecology, i used for that a very small  
> program called sppa, at that time i did not know about R, but the  
> paper maybe helpful anyway
>
> cheers
>
> -------------------------------------------------------------------------------
> Christian Salas                     E-mail:christian.salas@yale.edu
> PhD candidate                       http://pantheon.yale.edu/~ces55
> School of Forestry and Environmental Studies
> Yale University                     Tel: +1-(203)-432 5126
> 360 Prospect St                     Fax:+1-(203)-432 3809
> New Haven, CT 06511-2189            Office: Room 35, Marsh Hall
> USA
>
> Yale Biometrics Lab                 http://environment.yale.edu/biometrics
> -------------------------------------------------------------------------------
>
>
>
>
> Gregoire, Timothy wrote:
>> Did you see this? Does it relate to something you have done in the  
>> past?
>> Tim
>> -------------------------------------------- -----Original  
>> Message-----
>> From: r-sig-geo-bounces@stat.math.ethz.ch [mailto:r-sig-geo-bounces@stat.math.ethz.ch 
>> ] On Behalf Of Enrico R. Crema
>> Sent: Wednesday, September 16, 2009 9:21 AM
>> To: r-sig-geo@stat.math.ethz.ch
>> Subject: [R-sig-Geo] Bivariate Inhomogeneous K function?
>> Dear List,
>> I was wondering if there is actually a bivariate version of   
>> inhomogenous K function. My dataset present the distribution of  
>> two  types of events (archaeological findings) and I have noticed  
>> that the  joint pattern (thus ignoring the type of the point) show  
>> non- stationarity. This is due to a known first order-propriety  
>> which  affects both types of artifacts in the very same way.  
>> However when  assessing the significance in the interaction of the  
>> two types,  the  default null-hypothesis for population  
>> independence will not consider  such joint first order effect in  
>> the confidence envelope. Is there a  way to solve this issue?
>>  I am currently writing a code using the rpoint() function of   
>> spatstat, so that points of one type or other are created through  
>> the  provision of a intensity  surface retrieved from the joint   
>> distribution of the two points. This is then integrated for the   
>> creation of the confidence envelope. Is there something wrong with   
>> this approach??? Many thanks!!
>> Enrico
>> ---------------------------------------
>> Enrico R. Crema
>> PhD Candidate
>> Institute of Archaeology, UCL
>> AHRC Centre for the Evolution of Cultural Diversity, UCL
>> http://www.cecd.ucl.ac.uk/people/?go1=91
>> +44 7899093191
>> e.crema@ucl.ac.uk
>> enrico.crema@gmail.com
>> 	[[alternative HTML version deleted]]
>> _______________________________________________
>> R-sig-Geo mailing list
>> R-sig-Geo@stat.math.ethz.ch
>> https://stat.ethz.ch/mailman/listinfo/r-sig-geo
> <06sparuca_Foreco2006.pdf>



---------------------------------------
Enrico R. Crema
PhD Candidate
Institute of Archaeology, UCL
AHRC Centre for the Evolution of Cultural Diversity, UCL
http://www.cecd.ucl.ac.uk/people/?go1=91
+44 7899093191
e.crema@ucl.ac.uk
enrico.crema@gmail.com








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