Year as covariate : 0 density/abundance estimates

[Flocrn]

Dear all,

I'm also working on detection function with multiple year. I'm trying to do a single detection function with all my data across the years.

I fixed the problem of unconsistency by setting 1 value of area per year. I don't have the error message anymore.

But, when I compute the ds function, I have 0 for all my density and abundance estimators and I can't find why.

I tried to calculate them with dht function, and I discovered this error :

"Must specify obs.table because Sample.Label and/or Region.Label fields not contained in data"

This is very strange, since they are in my data, and are found when I take the years individually.

Thank you by advance for your response,

Best regards,

Floriane Cornué

[Eric Rexstad]

Floriane

Thanks for your question.  Are you willing to send to me your data (or a subset I could use to diagnose the problem) and the code you have used.  If you send it off-list, I will see if I can understand the situation giving your problems.

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From: 'Flocrn' via distance-sampling <distance...@googlegroups.com>
Sent: 23 November 2021 10:57
To: distance-sampling <distance...@googlegroups.com>
Subject: [distance-sampling] Year as covariate : 0 density/abundance estimates

 

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[Flocrn]

Dear all,

The problem has been solved by removing the object field. It was also possible to fill the object field with numbers from 1 to the number of detections. 

Thank you very much Eric to help me with this problem.