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 ?
Web-based surveys reach a self-selecting sample of people with access to the internet and, unlike the established methods used in Omnibus polls, do not produce a statistically representative sample.
You may argue that this is a self-selecting sample but you have already identified publicly an increased percentage of schools going into special measures or serious weaknesses and the NAHT survey reflects this.
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.