revisitation rate

[Odd Jacobson]

Hi all,

I was wondering if there was a relatively simple way to extract an estimate for the overall "revisitation rate" from the output of ctmm::revisitation()? I am not sure whether this makes much sense because it seems that this function provides a UD object. But, I was thinking maybe it could be possible to extract in a similar way that the encounter rate estimate from enconounter() can be extracted from the cde. However, I don't know how these things work exactly.

I basically want to be able to compare across different UDs, the degree to which the animal reused areas within its home range (i.e., whether animal A travelled to more "new" areas than animal B). Of course, the number of revisits along an animals trajectory may be biased by the number of locations along the trajectory, the temporal scale of the sampling window, etc, so I am trying to find a probabilistic approach. I thought it would be best to reach out to the ctmm community to get some thoughts before trying out the recurse package.

Thanks in advance,

Odd

[Christen Fleming]

Hi Odd,

That's an interesting idea. I will add it to my to-do list and look at it over the summer when I am writing the book chapter on spatial distributions (including the revisitation distribution).

Best,

Chris

[Odd Jacobson]

Sounds great, thanks Chris! Looking forward to it.

Best,

Odd

[Odd Jacobson]

Hi Chris,

I am wondering if there is any update about this? Basically, I'm looking for a metric that captures general revisitation rate—essentially, how fast an animal reuses its range—that can be compared across individuals or groups with different-sized UDs. Is the home range crossing time (tau [position]) a good candidate for this? Alternatively, could speed or diffusion rate from the FITs be interpreted in this way? 

Thank you for your insight.

Best,

Odd

[Christen Fleming]

Hi Odd,

I've updated the revisitation() functionality and it now calculates the mean revisitation rate per radial meter in the rates slot.

Best,

Chris