Sample Area

[margaret....@gmail.com]

Hi all, 

I have been running the same distance analysis every few years to update density estimates to include the most recent dataset. I have updated the code as things have been deprecated (e.g., convert.units, dht.group, etc). Besides that the structure of my code has not changed. This year when I ran the analysis using my most recent dataset I noticed that the density estimates were really far off from what they should be. I looked into it more and I am pretty sure it is something on the backend of the ds function where sample area is not being calculated like it should be and the Sample.Area  and Area are coming out the same (it is a point transect and I put in 0 for Area in a flat file). In prior years the Sample.Area has always been calculate based on the Regions, but now it is the same exact as the Area column. Any insight as to why this is happening would be greatly appreciated. 

Thanks!

Maggie

[Eric Rexstad]

Maggie

Thanks for your question; afraid I cannot diagnose the problem at this point.  By "Sample.Area" do you mean "Covered Area" as shown in the sample output below:

I'd appreciate it if you could (off-list) provide more details. Specifically, I'd be curious to know, if possible, what versions of Distance​ and mrds​ you were using for your previous results and the versions associated with your "altered" results. I may want to look at code and data if we can't sort the problem otherwise.

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From: distance...@googlegroups.com <distance...@googlegroups.com> on behalf of margaret....@gmail.com <margaret....@gmail.com>
Sent: 14 March 2024 16:07
To: distance-sampling <distance...@googlegroups.com>
Subject: [distance-sampling] Sample Area

 

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