Opportunistic biases: Their origins, effects, and an integrated solution

Area of Science:

• Psychological science
• Research methodology

Background:

• Researchers explore data through multiple analyses before publication.
• This practice, while aiding discovery, introduces "opportunistic bias."
• Opportunistic bias inflates reported findings, potentially exceeding true effect sizes.

Purpose of the Study:

• To explain how common research practices create opportunistic bias.
• To discuss the prevalence and impact of this bias in psychology.
• To evaluate existing and propose new solutions to mitigate opportunistic bias.

Main Methods:

• Review of accepted research practices contributing to bias.
• Analysis of the prevalence of these practices in psychological research.
• Evaluation of methodological strategies for bias correction.

Main Results:

• Accepted practices like data exploration can lead to significant "opportunistic bias."
• This bias distorts findings, making them appear stronger than reality.
• Opportunistic biases are often unreported and difficult to detect.

Conclusions:

• Opportunistic bias undermines the validity and clarity of research findings.
• Addressing this bias is crucial for the integrity of psychological science.
• An integrated solution is proposed to reduce the influence of opportunistic bias.