This new come across price variance is usually the dominant factor toward full variance into the thickness (Fewster et al
- Places exclude the individuals in which webcams never functioned, and you can suggest sampling months for each and every location and you can camera-days include merely weeks when adult cams performed and you will just weren’t visited by researchers. And found is variety of digital camera-weeks subsampled from for every subset (one hundred arbitrary types of per size was picked from each respective studies set; find Content and methods).
- † Items off subsamples off digital camera-months (thousands).
The empirical, design-based variance of densities estimated by CTDS includes components for both detection probability and encounter rate (Fewster et al. 2009 ). 2009 , Howe et al. 2017 ). Therefore, to simplify the analyses of the many subsets of the data, we did not estimate density, and we ignored the detection probability component of the variance.