#statistics 

**Regression toward the mean** - a tendency for scores, particularly extreme scores ([[Outliers]]), to shrink toward the [[Measures of central tendency|mean]].

This tendency often appears among subsets of observations whose values are extreme and at least partly due to chance.

Example:
![[Pasted image 20230909192441.png]]
Appears in many [[Frequency distribution|distributions]]:
![[Pasted image 20230909192730.png]]

## Regression fallacy
**Regression fallacy** - whenever [[Regression|regression]] toward the mean is interpreted as a real, rather than a chance, effect.
![[Pasted image 20230909193406.png]]
![[Pasted image 20230909193417.png]]

![[Pasted image 20230909193537.png]]