Zero-Truncated Poisson Test

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This test requires more than three samples to be taken and is suitable for closed populations. It is automatically calculated whenever a closed population estimation method is selected, and the results can be viewed by clicking on the Equal Catchability Closed tab. It is zero-truncated because there is no information on the animals that avoided capture. The expected frequency distribution given equal catchability is determined using the mean number of captures for the tagged animals. This mean is then used to calculate the Poisson distribution parameter, m, by iteration.

 

The observed and expected distributions are then compared using a χ2 test.