self-selection

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self-selection

a circumstance in which the allocation of units of a population to one or other of two groups which are to be compared is done by the units, e.g. the sick animals in one group, the not-sick in the other. See also volunteer sample.
References in periodicals archive ?
The sample size is far greater than a professional poll, Morris Menasche says, and -- despite the self-selective nature of the response -- the polls have proven surprisingly accurate.