Barker Robust Design

[Fish_Boy]

Does anyone have experience with or have an example of when and where a Barker Robust Design would be used? I am assuming this model is Robust Design for Combined Recapture/Recovery data?

It has been a while since I received a run-the-first-model, but this may be one of those questions. Is there a tutorial file or updated Chapter which deals with this topic? Any help would be greatly appreciated.

[Morten Frederiksen]

It's been a while since this question came up with no replies. I have essentially the same question: has anybody actually used the Barker Robust Design in MARK, and is there any documentation or reference for this model? It seems a reasonably straightforward combination of the two approaches, but it would be nice to know if anybody had tried to use it and perhaps found (and solved) problems.

Any help would be appreciated!

[Fish_Boy]

I discussed the topic at length with Bill Kendall and we implemented a field program to utilize the Barker Robust Design for fish stranding studies. We had hoped to provide an estimate of mortality on the tagged population however, after applying several thousand tags we recovered only a single beached individual with a tag and two trapped indviduals with tags.

I have used Robust Design often and it is very data hungry. The Barker Robust Design can be used with the proper study design and of course lots of data. I would suggest contacting Bill Kendall. He was very interested in my study and approach and he provided me some very good advice on the caveats and assumptions that we were able to address in our study design.

[claudiapenaloza]

We've (Kendall, Barker, White, Lindberg, Langtimm, Penaloza) implemented the Barker Robust Design with a manatee data set and have a manuscript in review explaining the method in detail. It is a pretty straight forward combination of both methods, with a few new names for some parameters (e.g.: gamma" and gamma' are defined as availability, a" and a', depending on whether an individual that is available for capture was or was not available for capture the previous year), though I'm not sure if Gary has implemented these in MARK yet. I can keep you posted as it gets further along. Maybe forward you a copy at the print-proof stage?

[Morten Frederiksen]

Thanks Claudia! Would be excellent if you could keep me posted and send me e.g. proofs when available (mfr (at) dmu.dk). Much appreciated!

[claudiapenaloza]

Thanks Claudia! Would be excellent if you could keep me posted and send me e.g. proofs when available (mfr (at) dmu.dk). Much appreciated!

Will do.

[Guillaume Souchay]

hi,

about the Barker Robust Design, I have a basic question: I was wondering about the data formatting.
I have 5 primary occasions and 2 secondary occasions, so in my case, is it LLDLLDLLDLLDLLD or LDLDLDLDLDLDLDLDLDLD ?
In the first case, I tried it but Mark gave me an error message:
encounter history was too short for the number of occasion specified

At the beginning, I entered 10 for the number of encounter occasions and used the Easy Robust Design by giving 5 for number of primary session.
So, I don't understand the error message.

here are some example of my dataset:

Code: Select all

010000000000000 1;
010000100000000 1;
010000000010000 1;
010000000001000 1;
010000000000000 1;
010100010001000 1;

Could anyone explain where I am wrong ?

Thanks a lot !

Guillaume

[claudiapenaloza]

If I remember correctly... MARK is expecting an LDLD data structure, not and LLD data structure. The first D for every primary period would be just a place holder in your case.

[Fish_Boy]

@claudiapenaloza I too would be very interested in reading the paper. Our implementation of the study design would have worked had we recovered enough dead fish. It is nice to see this string has received some life!

Cheers, Patrick

[Guillaume Souchay]

@claudiapenaloza Thanks for your reply. I also asked directly to Gary White during EURING. After I had to manage other analyses, so, I take time now to thank you.

Do you know when this paper about the Barker Robust Design will be available, and do you (or Jeff) know if a RMARK example will be provided ?

After succeeding to use the Barker RD with MARK, I analysed several (~100) simulated dataset with RMARK and I was wondering if gamma" and gamma' used in RMARK referred to a" and a' (the notation in the Barker RD) or referred to the regular notation in RD ?
Interpretation would not be the same depending on the answer as a" = 1 - gamma" and a' = 1- gamma' (regular notation in RD)

Thanks for your help !

Guillaume