Table 3 Comparison of the structure of the capture histories (CH) derived from classification of snow leopard images by eight observers (Obs 1–4 were non-experts, Obs 5–8 were experts) with the true capture history (TRUE).
From: Identification errors in camera-trap studies result in systematic population overestimation
CH structure | Population estimate | Bias in population estimate | ||||||
5 | 4 | 3 | 2 | 1 | True | Remaining | ||
TRUE | 1 | 2 | 5 | 4 | 4 | 16.6 ± 0.9 | +3.7% | +3.7% |
Obs1 | 0 | 2 | 3 | 6 | 7 | 20.3 ± 2.0 | +27% | +35% |
Obs 2 | 1 | 1 | 1 | 4 | 8 | 23.9 ± 7.2 | +49% | +84% |
Obs 3 | 1 | 2 | 3 | 6 | 6 | 21.0 ± 2.8 | +31% | +31% |
Obs 4 | 0 | 2 | 2 | 9 | 7 | 22.8 ± 2.3 | +42% | +42% |
Obs 5 | 1 | 1 | 3 | 5 | 8 | 23.5 ± 4.5 | +47% | +56% |
Obs 6 | 0 | 3 | 2 | 6 | 9 | 22.8 ± 2.3 | +42% | +42% |
Obs 7 | 2 | 0 | 5 | 5 | 3 | 16.1 ± 1.3 | +0.6% | +7% |
Obs 8 | 3 | 0 | 2 | 5 | 8 | 23.2 ± 3.9 | +45% | +45% |
