selection bias

Noun

 * 1) The bias introduced by the selection of individuals, groups, or data for analysis in such a way that proper randomization is not achieved, thereby ensuring that the sample obtained is not representative of the population intended to be analyzed.

Translations

 * Finnish: valintaharha, valikoitumisharha
 * French: biais de sélection
 * German: Auswahlverzerrung
 * Polish: błąd selekcji