CTT vs Lotek tag data analysis in R

Analysis and Data
1

Hello,

I am new to analyzing data for CTT lifeTags and many of the data columns that I am used to being populated for Lotek nanotags are filled with NAs. The columns are: freq, freqsd, sigsd, noise, slop and burstSlop.

There is a perfect association in my data between tag type (CTT vs Lotek) and whether there are NAs in these columns so I am assuming that these data are not generated by CTT tags and are not required for analysis. Is that a correct assumption? I understand that CTT tags switch frequencies to encode IDs so I figured that’s why these columns are NAs, but I wanted to verify.

Thank you, Sarah

2

Hi Sarah,

With the caveat that I’ve mostly worked with Lotek tag data too and haven’t done much with CTT tag data yet, I believe you’re correct. In my preliminary looks at CTT data, I’ve removed any detections with a run length of 1 and that has seemed to work well enough for a first pass of false positive removals. I’m sure there are more sophisticated ways to do it that would perform better, but I haven’t worked with CTT tag data enough yet to have figured those out.

Cheers, Amie

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