Colext, uneven time periods

[Griffin Dare]

Hi all,

Just started a new position and I'm analyzing a bit of an odd dataset in terms of the seasons. Amphibian surveys were done in 2010, 2011, 2012, 2015, 2018 and 2021 at 62 sites (usually 3 visits per year). Not sure if it was budget or time but surveys started out yearly but going forward are done every 3 years.

This is my first foray into dynamic models and my initial thought was that we'd have to throw out the 2010-2011 data and stick with a three year interval (2012, 2015, 2018, 2021). Our main goal is to look at occupancy trends over time. 

One note, I'm actually doing this in stan_colext but don't think that matters in this context.

Thanks,

Griffin

[Marc Kery]

Dear Griffin,

I'd fill in the data with missing values (for the missing years) to create balance and then use all the data. Always a pity to throw out valuable data. Filling in the missing years implicitly scales all the dynamic parameters to a one-year interval.

Best regards  -- Marc

---

From: unma...@googlegroups.com <unma...@googlegroups.com> on behalf of Griffin Dare <griffin...@gmail.com>
Sent: Monday, June 13, 2022 19:20
To: unmarked <unma...@googlegroups.com>
Subject: [unmarked] Colext, uneven time periods

 

--
*** Three hierarchical modeling email lists ***
(1) unmarked (this list): for questions specific to the R package unmarked
(2) SCR: for design and Bayesian or non-bayesian analysis of spatial capture-recapture
(3) HMecology: for everything else, especially material covered in the books by Royle & Dorazio (2008), Kéry & Schaub (2012), Kéry & Royle (2016, 2021) and Schaub & Kéry (2022)
---
You received this message because you are subscribed to the Google Groups "unmarked" group.
To unsubscribe from this group and stop receiving emails from it, send an email to unmarked+u...@googlegroups.com.
To view this discussion on the web visit https://groups.google.com/d/msgid/unmarked/25c75599-4726-4a62-8e5c-2a8d4f7bf80an%40googlegroups.com.

[Griffin Dare]

Hi Mark,

Thanks for the prompt reply. So by that do you mean simply adding NA's visits in missing years?

Griffin

You received this message because you are subscribed to a topic in the Google Groups "unmarked" group.
To unsubscribe from this topic, visit https://groups.google.com/d/topic/unmarked/kZ1KKPn0y3g/unsubscribe.
To unsubscribe from this group and all its topics, send an email to unmarked+u...@googlegroups.com.
To view this discussion on the web visit https://groups.google.com/d/msgid/unmarked/ZR0P278MB08695C9DB7DA2AFF00C24E3BEBAB9%40ZR0P278MB0869.CHEP278.PROD.OUTLOOK.COM.

[Marc Kery]

Yes, as simple as that

---

From: unma...@googlegroups.com <unma...@googlegroups.com> on behalf of Griffin Dare <griffin...@gmail.com>

Sent: Monday, June 13, 2022 20:21
To: unma...@googlegroups.com <unma...@googlegroups.com>
Subject: Re: [unmarked] Colext, uneven time periods

 

To view this discussion on the web visit https://groups.google.com/d/msgid/unmarked/CAPcekvXDX49BLR6daKc_vPy7_3C%2B0q-3vCzipPkXOvVetanEOw%40mail.gmail.com.

[Griffin Dare]

Great thanks, happy to be including that data!

To view this discussion on the web visit https://groups.google.com/d/msgid/unmarked/ZR0P278MB0869CD272AC62D9AB0603861EBAB9%40ZR0P278MB0869.CHEP278.PROD.OUTLOOK.COM.

[Marc Kery]

Would be a shame not to.

---

From: unma...@googlegroups.com <unma...@googlegroups.com> on behalf of Griffin Dare <griffin...@gmail.com>

Sent: Monday, June 13, 2022 20:24

To view this discussion on the web visit https://groups.google.com/d/msgid/unmarked/CAPcekvVUirqiEhR0Aj2kspX%2Brtiup4UXQ178BgE3SxqUdFp53g%40mail.gmail.com.

[Marc Kery]

Correction/addendum (comment by Jim Baldin):

"I'm going to argue that it isn't quite as simple as that.  If there are covariates for colonization or extinction in any of the completely missing years, then the covariate values need to be included and not set to missing.  It would only be the responses in the missing years (i.e., the associated values in y) that would be set to NA.  I assume that's what you meant but I'm not so sure that others might also assume that."

Yes, indeed, and thanks, Jim.

Marc

---

From: unma...@googlegroups.com <unma...@googlegroups.com> on behalf of Marc Kery <marc...@vogelwarte.ch>
Sent: Monday, June 13, 2022 20:22

To view this discussion on the web visit https://groups.google.com/d/msgid/unmarked/ZR0P278MB0869CD272AC62D9AB0603861EBAB9%40ZR0P278MB0869.CHEP278.PROD.OUTLOOK.COM.