Category:Definitions/Capture-Recapture Sampling
This category contains definitions related to Capture-Recapture Sampling.
Related results can be found in Category:Capture-Recapture Sampling.
Capture-recapture sampling is a statistical technique for estimating the size of animal populations.
In its simplest form, a sample of $n_1$ animals is captured, and each one tagged and released.
A second sample of $n_2$ animals is captured at a later date, and the number $m$ of animals which were tagged in the first round is noted.
If the unknown population size is $N$ and any animal is equally likely to be captured, the proportion $\dfrac m {n_2}$ of tagged to untagged animals is a reasonable estimate of the unknown proportion $\dfrac {n_1} N$ of tagged animals to the whole population.
Hence our estimate $N^*$ of $N$ can be calculated as:
- $N^* = \dfrac {n_1 n_1} N$
provided $m \ne 0$.
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