selection bias

selection bias
systematic error in the manner in which cases and controls are chosen for a study or for allocation to groups.

Medical dictionary. 2011.

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  • 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 — 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… …   English dictionary of cancer terms

  • 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

  • Bias — In a clinical trial, bias refers to effects that a conclusion that may be incorrect as, for example, when a researcher or patient knows what treatment is being given. To avoid bias, a blinded study may be done. * * * 1. Systematic discrepancy… …   Medical dictionary

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