Selection bias
Selection Bias
Selection bias (/sɪˈlɛkʃən baɪəs/) is a type of bias that occurs when the sample obtained is not representative of the population intended to be analyzed. It can lead to a distortion of the results and conclusions of a study or research.
Etymology
The term "selection bias" is derived from the English words "selection" and "bias". "Selection" comes from the Latin word "selectio", meaning "to choose", and "bias" comes from the Old French "biais", meaning "slant, slope, oblique".
Related Terms
- Bias: A systematic error introduced into sampling or testing by selecting or encouraging one outcome or answer over others.
- Sampling bias: A bias in which a sample is collected in such a way that some members of the intended population are less likely to be included than others.
- Confounding: A situation in which the effect or association between an exposure and outcome is distorted by the presence of another variable.
- Observational study: A type of study in which individuals are observed or certain outcomes are measured.
- Randomized controlled trial: A type of scientific experiment that aims to reduce bias when testing a new treatment.
See Also
External links
- Medical encyclopedia article on Selection bias
- Wikipedia's article - Selection bias
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