Can't run Bootstrap GOF with occupancy model

[sixtystrat]

My computer crashes when I try to do a bootstrap GOF with an occupancy model. I want to estimate expected and observed deviance so I can estimate c-hat. Everything else seems to work fine and my other data sets seem okay. I have uninstalled and reinstalled Mark several times to no avail. Thanks for any help!
Joe Clark

[darryl]

Hi Joe

Don't quote me on this one, but I don't think the bootstrap GOF test is designed to be used with the occupancy models; perhaps that is causing the crash.

There is however a test that has been specifically developed for occupancy models that is implemented in the software PRESENCE (downloadable from http://www.mbr-pwrc.usgs.gov/software.html). It's only designed for the single season/year analysis. The actual method is described in MacKenzie and Bailey (2004) Assessing the fit of site occupancy models, JABES. You can download a pdf of this paper from my bio page at http://www.proteus.co.nz

Hope this helps
Darryl

[sixtystrat]

Thanks Darryl. You may be right. I'll get your paper and do some more reading.
Joe

[gwhite]

Joe:

I have posted a new MARK version that fixes this bug, plus also allows you to run the median c-hat procedure with simple occupancy data. You can also construct the chi-squared test mentioned by Darryl by dumping the observed and expected values into an Excel spreadsheet and computing a Pearson chi-square statistic. Also, the Pearson chi-square statistic is printed in the full output, and this value would be generally appropriate for simple occupancy data.

Gary

[cooch]

Joe:

I have posted a new MARK version that fixes this bug, plus also allows you to run the median c-hat procedure with simple occupancy data. You can also construct the chi-squared test mentioned by Darryl by dumping the observed and expected values into an Excel spreadsheet and computing a Pearson chi-square statistic. Also, the Pearson chi-square statistic is printed in the full output, and this value would be generally appropriate for simple occupancy data.

Gary

Which has just been mirrored at

http://www.phidot.org/software/mark/download/

[sixtystrat]

Thanks guys. I'll check it out.
joe