Supplement 1. WinBUGS code for model .

File List
spatial_dep_model.txt -- WinBugs model definition file

spatial_dep_script.txt -- WinBugs script file

spatial_dep_data.txt -- Sample data file

Description
Input data consists of the matrix hij, the
detection/nondetectin data for site i, survey j.

In the code, zi denotes presence
(zi =1) or absence (zi=0)
at the level of the sample unit, i; yij denotes local presence
(yij = 1) or absence (yij = 0) on segment j;
and hij denotes detection (hij =1) or not
(hij =0) on segment j of sample unit i.
Each of these random variables is modeled as a Bernoulli trial,
the latter two conditional on occupancy at sample unit and segment scale:

All model parameters were given uniform prior distributions, U(0,1).

-- IMAGE: Please see in attached file. --