A Test for Equal Catchability

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Abstract
One assumption of standard capture-recapture analysis, that all individuals in the population under study have equal probabilities of being observed in any sample, will be broken if individuals are inherently different in their behavior with respect to the method of sampling, or if their behavior alters as a result of being sampled. If an identifiable population of known size is available the 1st-mentioned feature may be studied by sampling on 2 occasions. Two situations are likely to occur, either that this identifiable population is representative of the whole population, or that it has been obtained by sampling by the method under study. For each of these situations tests are derived of the hypothesis of equal catchability, and numerical comparison is made between the powers of the 2 tests. The effect on the tests of individuals'' death is discussed.

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