Encyclopedia of Clinical Neuropsychology

2018 Edition
| Editors: Jeffrey S. Kreutzer, John DeLuca, Bruce Caplan

ANCOVA/MANCOVA

  • Michael FranzenEmail author
Reference work entry
DOI: https://doi.org/10.1007/978-3-319-57111-9_1868

Synonyms

Analysis of covariance

Definition

ANCOVA or analysis of covariance is a variant of the ANOVA model in which the statistical effect of a nuisance variable is removed mathematically from the analysis in order to clarify the relations between the independent and the dependent variables (Belin and Normand 2009). The optimal situation would be if the independent variable levels or groups were not related to the nuisance variable. However, if the nuisance variable is related to the dependent variable and if the nuisance variable is systematically represented among the independent variables, ANCOVA may be used to partial out the statistical effect of the nuisance variable or covariate. This is not a substitute for removing the effect through experimental design. For example, level of education may be statistically related to performance on a memory test. If two groups of depressed and nondepressed individuals differ systematically on the basis of their level of education, any...

This is a preview of subscription content, log in to check access.

References

  1. Airaksinen, E., Larsson, M., & Fosell, Y. (2005). Neuropsychological functions in anxiety disorders in population-based samples: Evidence of episodic memory dysfunction. Journal of Psychiatry Research, 39, 207–214.CrossRefGoogle Scholar
  2. Belin, T. R., & Normand, S.-L. T. (2009). The role of ANCOVA in analyzing experimental data. Psychiatric Annals, 39, 753–759.CrossRefGoogle Scholar
  3. Watson, P. (2009). Review of analysis of variance and covariance: How to choose and construct models for the life sciences. Psychological Medicine, 39, 695–696.CrossRefGoogle Scholar
  4. Wildt, A. R., & Ahtola, O. T. (1978). Analysis of covariance. Beverly Hills: Sage.CrossRefGoogle Scholar

Copyright information

© Springer International Publishing AG, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Allegheny General HospitalPittsburghUSA