Publication Bias
Publication Bias - Related Videos
01:31
Confirmation Biases
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2020
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? Another...
01:12
Hindsight Biases
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2020
Hindsight bias leads you to believe that the event you just experienced was predictable, even though it really wasn’t. In other words, you knew all along that things would turn out the way they did. Can you relate this to the phrase "Hindsight is 20/20" now? This text is adapted from OpenStax, Psychology. OpenStax CNX.
01:30
Biases II
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2025
Biases such as loss aversion, anchoring bias, and herd behavior significantly affect how people make decisions in everyday situations, often steering them away from logical reasoning. These biases reveal the emotional and social factors that influence people’s choices.Loss aversion is the tendency to fear losses more intensely than valuing equivalent gains. For example, Emma may hesitate to cancel a monthly subscription she barely uses, focusing on the perceived loss of the service rather than...
01:22
Bias
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2023
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...
01:15
Public Relations I
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2024
Public Relations (PR) is a strategic communication process that builds mutually beneficial relationships between organizations and the public. It's about influencing, engaging, and building a relationship with key stakeholders to shape and frame the public perception of an organization. PR can be used to protect, enhance, or build reputations through the media, social media, or self-produced communications. A good PR campaign can provide credibility and enhance the organization's reputation by...
FAQs
Bias can enter before, during, or after a study is conducted. Researchers may choose not to initiate a question, withhold a submission, or selectively report results; sponsors, editors, and reviewers can also influence which findings become visible. Because these decisions operate at several points, correcting the published record requires more than examining editorial acceptance alone.
Null or unfavorable findings can disappear from the evidence base, leaving the available studies disproportionately favorable. In a systematic review or meta-analysis, that imbalance can inflate the estimated effect and make confidence in the conclusion seem stronger than warranted. The resulting distortion can then affect evidence-based decisions, even when the underlying research record contains contrary results.
The problem is not confined to what appears in an article. It may reflect selective initiation, submission, acceptance, or reporting, so a visible result can be shaped before analysis is published. This broader pathway matters statistically because the missing evidence is difficult to observe directly, limiting how confidently researchers can interpret the published record.
Statistical assessment commonly combines funnel plots, regression-based tests, and sensitivity analyses. These approaches give reviewers several ways to examine whether the available evidence shows signs of selective visibility and whether conclusions change under alternative assumptions. They are especially relevant when a review or meta-analysis produces an apparently strong or favorable estimate.
Preregistration and complete results reporting address publication bias by making it harder for studies or findings to remain invisible after research begins. These practices are preventive rather than purely diagnostic: they aim to preserve a fuller evidence base before a systematic review or meta-analysis estimates an overall effect.
Readers should consider publication bias when applying statistical evidence to decisions, not only when evaluating individual study quality. If the visible literature may overestimate effects, conclusions should be interpreted cautiously and checked with bias assessments and sensitivity analyses. This is important wherever systematic reviews or meta-analyses guide evidence-based decisions.