# Residual mean square

This article provides insufficient context for those unfamiliar with the subject. (Learn how and when to remove this template message) |

In statistics, the **residual mean square** is defined as

where df is the degree of freedom. In many simple cases, df = *N* − γ where *N* is the number of discrete data points fitted and γ is the number of identifiable and independently fitted parameters.

This article does not cite any sources. (June 2007) (Learn how and when to remove this template message) |

Categories:

- Articles to be merged since February 2007
- Pages with broken file links
- Wikipedia articles needing context
- All Wikipedia articles needing context
- Wikipedia introduction cleanup
- All pages needing cleanup
- Articles lacking sources from June 2007
- Articles with invalid date parameter in template
- All articles lacking sources
- Statistics stubs
- Statistical theory
- Statistical deviation and dispersion
- Error
- Measurement