self-selection

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Related to Self-selecting sample: convenience sample

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 ?
There are however some drawbacks, including technical incompatibilities; no universal e-mail directory; time delays in completion and return; and low penetration of the population, leading to self-selecting samples.
Previous studies of Internet users have been based on the estimated number of users per host or have employed self-selecting samples.