Hi Help me please

[Michelle Bustamante]

Hello!

I have fitted the tree detectability models to a dataset of visual records of resplendent quetzals in sampling transects in Guatemala. I want to extract detectability values and other values from the uniform model using the command summarize_ds_models(BQ.uni, output="plain"). However, I'm getting this error: > summarize_ds_models(BQ.uni, output="plain") Error in [.data.frame(res, , 4:7) : undefined columns selected.

Could you help me resolve it?

Thanks a lot!!

[Eric Rexstad]

Good morning Michelle

If you apply the function summary(BQ.uni)​ you will discover that the fitted detection function has estimated the probability of detecting your study animals to be 1.00. In other words perfect detectability out to the truncation distance. Consequently, the number of animals estimated to be in the covered region is the same as the number detected. Therefore the number of animals estimated to be in the study area is the number detected multiplied by the inverse of the proportion of the study area sampled.

In summary: when a uniform key function without adjustment terms is fitted, summarize_ds_models​ does not produce estimate of detection probability (instead produces the error you described). However, all the information you want can be found using the function summary()​.

I will log the error message you describe so it can be resolved in future releases of the package.

---

From: distance...@googlegroups.com <distance...@googlegroups.com> on behalf of Michelle Bustamante <michelle.amazi...@gmail.com>
Sent: 18 March 2024 21:04
To: distance-sampling <distance...@googlegroups.com>
Subject: [distance-sampling] Hi Help me please

 

--
You received this message because you are subscribed to the Google Groups "distance-sampling" group.
To unsubscribe from this group and stop receiving emails from it, send an email to distance-sampl...@googlegroups.com.
To view this discussion on the web visit https://groups.google.com/d/msgid/distance-sampling/45abb03c-6f92-46cd-8662-a0cecd211f34n%40googlegroups.com.