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Related Concept Videos

Bias01:22

Bias

Bias refers to any tendency that prevents a question from being considered unprejudiced. In research, bias occurs when one outcome or answer is selected or encouraged over others in sampling or testing. Bias can occur during any research phase, including study design, data collection, analysis, and publication.
In statistics, a sampling bias is created when a sample is collected from a population, and some members of the population are not as likely to be chosen as others (remember, each member...
Bias in Epidemiological Studies01:29

Bias in Epidemiological Studies

Biases can arise at various stages of research, from study design and data collection to analysis and interpretation. Recognizing and addressing these biases is essential to ensure the validity and reliability of epidemiological findings.Broadly speaking, biases in epidemiology fall into three main categories: selection bias, information bias, and confounding. A more detailed description of possible biases is:
Motivational Bias01:25

Motivational Bias

Cognitive bias results from limitations in thinking and information processing, leading to systematic errors in judgment. Conversely, motivational bias stems from personal desires or emotions, causing distortions in perception to align with self-interest. Motivational bias influences how individuals perceive and attribute causes to events, often shaped by personal needs, goals, and self-esteem preservation. This bias can distort judgment, leading to inaccurate assessments of success, failure,...
Types of Biopharmaceutical Studies: Controlled and Non-Controlled Approaches01:23

Types of Biopharmaceutical Studies: Controlled and Non-Controlled Approaches

Biopharmaceutical studies constitute a vital field aiming to enhance drug delivery methods and refine therapeutic approaches, drawing upon diverse interdisciplinary knowledge. In research methodologies, the choice between controlled and non-controlled studies significantly influences the study's reliability and accuracy.
Non-controlled studies, commonly employed for initial exploration, lack a control group, rendering them susceptible to biases and external influences. In contrast, controlled...
Blind Procedures02:07

Blind Procedures

Ideally, the people who observe and record the children’s behavior are unaware of who was assigned to the experimental or control group, in order to control for experimenter bias. Experimenter bias refers to the possibility that a researcher’s expectations might skew the results of the study. Remember, conducting an experiment requires a lot of planning, and the people involved in the research project have a vested interest in supporting their hypotheses. If the observers knew which child was...
Confirmation Biases01:31

Confirmation Biases

The confirmation bias is the tendency to focus on information that confirms our existing beliefs and ignore information that is inconsistent with our expectations. For example, if you think that your professor is not very nice, you notice all of the instances of rude behavior exhibited by the professor while ignoring the countless pleasant interactions he is involved in on a daily basis. Have you ever fallen prey to the confirmation bias, either as the source or target of such bias?

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Related Experiment Video

Updated: Jun 13, 2026

Strand-Specific Analysis of Proteins at Replicating DNA Strands by Enrichment and Sequencing of Protein-Associated Nascent DNA Method
08:53

Strand-Specific Analysis of Proteins at Replicating DNA Strands by Enrichment and Sequencing of Protein-Associated Nascent DNA Method

Published on: May 2, 2025

Science mapping analysis characterizes 235 biases in biomedical research.

David Chavalarias1, John P A Ioannidis

  • 1Centre de Recherche en Epistémologie Appliquée, Ecole Polytechnique-CNRS, 32 Boulevard Victor, Paris, France.

Journal of Clinical Epidemiology
|April 20, 2010
PubMed
Summary

This study maps bias terminology in biomedical research using text mining. It reveals how different biases co-occur and evolve over time, aiding in understanding research limitations.

Related Experiment Videos

Last Updated: Jun 13, 2026

Strand-Specific Analysis of Proteins at Replicating DNA Strands by Enrichment and Sequencing of Protein-Associated Nascent DNA Method
08:53

Strand-Specific Analysis of Proteins at Replicating DNA Strands by Enrichment and Sequencing of Protein-Associated Nascent DNA Method

Published on: May 2, 2025

Area of Science:

  • Biomedical Research
  • Scientific Methodology
  • Data Science

Background:

  • Numerous bias types exist in research, often associated with specific fields or study designs.
  • Understanding the relationships and prevalence of these biases is crucial for scientific integrity.

Purpose of the Study:

  • To systematically map the terminology of bias across biomedical research.
  • To identify co-occurring biases and their prevalence in different research contexts.

Main Methods:

  • Advanced text-mining and clustering techniques were applied to over 17 million PubMed articles (1958-2008).
  • Analysis included 235 specific bias terms and 103 related terms.

Main Results:

  • Forty bias terms appeared in over 100 articles each.
  • 252 clusters of bias terms were identified, organized into maps showing co-occurrence and field-specific prevalence.
  • Confounding, selection bias, response bias, and publication bias showed increased usage over time.

Conclusions:

  • This systematic mapping provides a dynamic classification of biases in biomedical research.
  • The findings offer insights into the multifaceted nature of bias and its impact on scientific investigation.