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Catalogue of bias: novelty bias
BMJ Evidence-Based Medicine, 2023Novelty bias is the tendency for an intervention to appear better when it is new. It is also known as the ‘novel agent effects’ or ‘fading of reported effectiveness’.1 2 The mechanisms by which interventions appear better when new or new for a specific purpose are unknown and may involve other forms of bias having a more significant effect when an ...
Luo, Y, Heneghan, C, Persaud, N
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JAMA, 2022
This JAMA Guide to Statistics and Methods describes collider bias, illustrates examples in directed acyclic graphs, and explains how it can threaten the internal validity of a study and the accurate estimation of causal relationships in randomized clinical trials and observational studies.
Holmberg, Mathias J, Andersen, Lars W
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This JAMA Guide to Statistics and Methods describes collider bias, illustrates examples in directed acyclic graphs, and explains how it can threaten the internal validity of a study and the accurate estimation of causal relationships in randomized clinical trials and observational studies.
Holmberg, Mathias J, Andersen, Lars W
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Catalogue of bias: observer bias
BMJ Evidence-Based Medicine, 2018This article is part of a series featured from the Catalogue of Bias introduced in this volume ofBMJEvidence-Based Medicine that describes biases and outlines their potential impact in research studies. Observer bias is systematic discrepancy from the truth during the process of observing and recording information for a study.
Mahtani, K +3 more
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Journal of Health Services Research & Policy, 2002
The British National Health Service and other publicly funded health systems operate on the principle that health care should be provided solely on the basis of need. Yet the literature abounds with reports of bias in health care use. In order to defend such a charge, two conditions must be met.
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The British National Health Service and other publicly funded health systems operate on the principle that health care should be provided solely on the basis of need. Yet the literature abounds with reports of bias in health care use. In order to defend such a charge, two conditions must be met.
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Catalogue of bias: allocation bias
BMJ Evidence-Based Medicine, 2018This article is part of a series of articles featuring the Catalogue of Bias introduced in this volume ofBMJ Evidence-Based Medicinethat describes allocation bias and outlines its potential impact on research studies and the preventive steps to minimise its risk.
Nunan, D, Heneghan, C, Spencer, E
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