integrating pcount and multinomPois data structures

[Catherine Austin]

Greetings group,

I am new to occupancy modeling and to unmarked (thank you for the pubs, vignettes, and this excellent group for guidance!).

I am wondering if anyone can point me toward a method - if there is one - for integrating two [stacked season] fish count data structures: 

1. four-pass snorkel counts within grid sites by two observers (summarized to 4 generic observations without individually modeled probability of detection for each person (Royle's N-mix, a la Som et al. 2018 in the Trinity River)), modeled using pcount, and 

2. three-pass electrofishing counts within grid sites sampled without replacement, ie removal sampling, modeled using multinomPois 

Maybe they need to remain separate model structures, but it would be great to be able to compare them more directly.

Thank you for your thoughts or resources,

Catherine

[Jeffrey Royle]

hi Catherine,

 In principle it is easy to develop this model in JAGS or similar languages simply by writing out the model explicitly and recognizing that the N parameter is shared between the two models.

 I can't think of a specific example like this but very similar in principle to the models described here:

Integrated distance sampling models for simple point counts - Kéry - 2024 - Ecology - Wiley Online Library

 If you have done Bayesian analyses before (using JAGS/Nimble/Stan/whatever) you can definitely do this.

regards

andy

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[Catherine Austin]

Thank you Andy! Your paper is very helpful; I'll see if I can figure the Stan or JAGS.

Best,

Catherine