selection bias

An error in choosing the individuals or groups to take part in a study. Ideally, the subjects in a study should be very similar to one another and to the larger population from which they are drawn (for example, all individuals with the same disease or condition). If there are important differences, the results of the study may not be valid.

English dictionary of cancer terms . 2015.

Look at other dictionaries:

  • Selection bias — is a statistical bias in which there is an error in choosing the individuals or groups to take part in a scientific study.[1] It is sometimes referred to as the selection effect. The term selection bias most often refers to the distortion of a… …   Wikipedia

  • selection bias — atrankos klaida statusas T sritis biomedicinos mokslai apibrėžtis ↑Sisteminė klaida, atsirandanti dėl netinkamos atrankos metodikos, kai skiriasi į tiriamąją ↑imtį patekę ir nepatekę žmonės arba tyrime dalyvavę ir nedalyvavę asmenys. Atrankos… …   Lithuanian dictionary (lietuvių žodynas)

  • selection bias — systematic error in the manner in which cases and controls are chosen for a study or for allocation to groups …   Medical dictionary

  • selection bias — Stats the effect on a statistical or clinical trial of unmeasured variables that are unknown to the researcher …   The ultimate business dictionary

  • sample selection bias — Non random selection is both a source of bias in empirical research and a fundamental aspect of many social processes. When observations in social research are selected so that they are not independent of the outcome variables in a study, sample… …   Dictionary of sociology

  • Sample Selection Bias — A type of bias caused by choosing non random data for statistical analysis. The bias exists due to a flaw in the sample selection process, where a subset of the data is systematically excluded due to a particular attribute. The exclusion of the… …   Investment dictionary

  • Bias — This article is about different ways the term bias is used . For other uses, see Bias (disambiguation). Bias is an inclination to present or hold a partial perspective at the expense of (possibly equally valid) alternatives. Bias can come in many …   Wikipedia

  • selection — noun 1 process of choosing/being chosen ADJECTIVE ▪ careful ▪ the careful selection of building materials ▪ random ▪ initial ▪ final …   Collocations dictionary

  • bias — See interview bias ; interviewer bias ; non response ; objective ; observer bias ; prejudice ; sample selection bias ; sampling error …   Dictionary of sociology

  • selection effects — See sample selection bias …   Dictionary of sociology

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