Which bias occurs when participants' characteristics affect group outcomes prior to intervention?
Understand the Problem
The question is asking about different types of biases in experimental research, specifically focusing on how participants' characteristics can impact the results of a study before any intervention takes place. The user is likely looking for information on which bias is specifically related to pre-intervention participant characteristics.
Answer
Selection bias.
The bias that occurs when participants' characteristics affect group outcomes prior to intervention is known as selection bias.
Answer for screen readers
The bias that occurs when participants' characteristics affect group outcomes prior to intervention is known as selection bias.
More Information
Selection bias arises when there are systematic differences in the characteristics of participants between study groups. It is related to how participants are chosen and can affect the validity of study outcomes.
Tips
A common mistake is confusing selection bias with performance or participant bias, which deal with different aspects of research conditions and participant behavior.
Sources
- Selection Bias - Health Knowledge - healthknowledge.org.uk
- Types of Bias in Research | Definition & Examples - Scribbr - scribbr.com
- Chapter 25: Assessing risk of bias in a non-randomized study - training.cochrane.org
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