ascertainment bias

ascertainment bias
systematic error causing failure to represent equally all groups of cases or persons that should be represented in a sample.

Medical dictionary. 2011.

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  • Ascertainment bias — In scientific research, ascertainment bias occurs when false results are produced by non random sampling and conclusions made about an entire group are based on a distorted or nontypical sample. If this is not accounted for, results can be… …   Wikipedia

  • 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

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  • Experimenter's bias — In experimental science, experimenter s bias is subjective bias towards a result expected by the human experimenter. David Sackett,[1] in a useful review of biases in clinical studies, states that biases can occur in any one of seven stages of… …   Wikipedia

  • Confirmation bias — (also called confirmatory bias or myside bias) is a tendency for people to favor information that confirms their preconceptions or hypotheses regardless of whether the information is true.[Note 1][1] As a result, people gather evidence and recall …   Wikipedia

  • 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

  • Cognitive bias — For an article about the conceptual problems of the mind see Cognitive closure (philosophy). Psychology …   Wikipedia

  • Omitted-variable bias — In statistics, omitted variable bias (OVB) occurs when a model is created which incorrectly leaves out one or more important causal factors. The bias is created when the model compensates for the missing factor by over or under estimating one of… …   Wikipedia

  • Outcome bias — The outcome bias is an error made in evaluating the quality of a decision when the outcome of that decision is already known. Overview One will often judge a past decision by its ultimate outcome instead of based on the quality of the decision at …   Wikipedia

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