Re: [R] [R-sig-Geo] Comparing spatial point patterns - Syrjala test

From: jiho <>
Date: Sun, 10 Feb 2008 08:20:32 +0100

On Feb 9, 2008 10:39 PM, milton ruser <> wrote:
> I have no idea of how to solve this issue, but I suggest you write to the
> authors of spatstat package. I think they could help you very much. Another
> thing is that there was a threhead on this many times ago. May be that Alan
> Swanson cold also help you.

Thank you for your answer. Indeed I saw this email during my research before posting my message. Unfortunately nobody answered it. I just hoped that things may have improved in this area of R since then and that potential authors, such as authors of the spatstat package, would be reading these lists.
I will contact those people personally indeed.

Thanks again.

> > At several stations distributed regularly in space[1], we sampled
> > repeatedly (4 times) the abundance of organisms and measured
> > environmental parameters. I now want to compare the spatial
> > distribution of various species (and test wether they differ or not),
> > or to compare the distribution of a particular organism with the
> > distribution of some environmental variable.
> > Syrjala's test[2] seems to be appropriate for such comparisons. The
> > hamming distance is also used (but it is not associated with a test).
> > However, as far as I understand it, Syrjala's test only compares the
> > distribution gathered during one sampling event, while I have four
> > successive repeats and:
> > - I am interested in comparing if, on average, the distributions are
> > the same
> > - I would prefer to keep the information regarding the variability of
> > the abundances in time, rather than just comparing the means, since
> > the abundances are quite variable.
> >
> > Therefore I have two questions for all the knowledgeable R users on
> > these lists:
> > - Is there a package in which Syrjala's test is implemented for R?
> > - Is there another way (a better way) to test for such differences?
> >
> > Thank you very much in advance for your help.
> >
> > [1]
> > [2]

Jean-Olivier Irisson
UMR 5244 CNRS-EPHE-UPVD, 52 av Paul Alduy, 66860 Perpignan Cedex, France
+336 21 05 19 90

______________________________________________ mailing list
PLEASE do read the posting guide
and provide commented, minimal, self-contained, reproducible code.
Received on Sun 10 Feb 2008 - 07:28:50 GMT

Archive maintained by Robert King, hosted by the discipline of statistics at the University of Newcastle, Australia.
Archive generated by hypermail 2.2.0, at Sun 10 Feb 2008 - 09:30:13 GMT.

Mailing list information is available at Please read the posting guide before posting to the list.

list of date sections of archive