Standard Article

Random Effects

  1. Vern T. Farewell

Published Online: 15 JUL 2005

DOI: 10.1002/0470011815.b2a09041

Encyclopedia of Biostatistics

Encyclopedia of Biostatistics

How to Cite

Farewell, V. T. 2005. Random Effects. Encyclopedia of Biostatistics. 6.

Author Information

  1. MRC Biostatistics Unit, Cambridge, UK

Publication History

  1. Published Online: 15 JUL 2005


The concept of random effects in a regression model is explained and contrasted with that of fixed effects. Statistical methods that make use of the concept are identified.


  • explanatory variables;
  • regression model;
  • dummy variables;
  • analysis of variance