R help - Mar 2011 - null model for a single species?

Dear List members,

I would like to test whether an observed occupancy of lakes in a landscape has
occurred randomly (by chance) or not.

How can I do that? The problem is that it concerns only a single species and I
would like to use binary data only.

At first I thought of generating null models and test the observed occupancy
against the randomly generated one. However, this needs more than one species...

Any hints are highly appreciated!

Best regards
Johannes Penner



Museum f?r Naturkunde (AG Herpetologie)
Invalidenstrasse 43
D-10115 Berlin
Tel: +49 (0)30 2093 8708

----------------------------------------
> Date: Mon, 7 Mar 2011 14:15:49 +0100
> From: Johannes.Penner at mfn-berlin.de
> To: r-help at r-project.org
> Subject: [R] null model for a single species?
>
> Dear List members,
>
> I would like to test whether an observed occupancy of lakes in a landscape
has occurred randomly (by chance) or not.
>
> How can I do that? The problem is that it concerns only a single species
and I would like to use binary data only.
>
> At first I thought of generating null models and test the observed
occupancy against the randomly generated one. However, this needs more than one
species...
>
[[elided Hotmail spam]]

Try a specialized list for eco or whatever applies. I'm not sure it would be
obvious
to many people here what you are trying to test or why you need another
speicies.
There are probably well known approaches that are just assumed among
specialists.

To refer to something in a set of obervations as an? effect of an identifiable
cause as opposed to "statstical fluctuation" presumbly requires some
notion
of the features of each so you could make a testable null hypothesis. Even
noise has a cause, it is just not something you care about. 



>
> Best regards
> Johannes Penner
>