# Selection bias: what it is and how it works · Zorraquino
> Selection bias occurs when the way participants or data are included distorts a study's conclusions.
URL: https://www.zorraquino.com/en/dictionary/selection-bias

# Selection bias

Selection bias occurs when the way participants or data are included distorts a study's conclusions

What it means, how it is used and where it comes up, with its related concepts.

[The whole glossary](https://www.zorraquino.com/en/dictionary)

## What it is and how it works

For example, researching only satisfied customers can hide reasons for churn. Reducing it involves defining the population and reviewing who is left out. Its effects are not resolved simply by increasing the number of cases from the same source.

Topics

[Research and insights](https://www.zorraquino.com/en/dictionary/category/investigacion-e-insights)

## Related concepts

- [Confirmation bias](https://www.zorraquino.com/en/dictionary/confirmation-bias)
- [Willingness to pay](https://www.zorraquino.com/en/dictionary/willingness-to-pay)
- [Focus group](https://www.zorraquino.com/en/dictionary/digital-marketing/focus-group.html)