ancova-class: Class "ancova" Analysis of Covariance

Description Objects from the Class Extends Methods Author(s) References See Also


Analysis of Covariance. The class is an extension of "aov" and "lm". It is identical to the "aov" for a single factor and a single covariate plus an attribute which contains a "trellis" object. Four different models are included in the class. See ancova for the examples.

Objects from the Class

A virtual Class: No objects may be created from it.


Class "aov", directly. Class "lm", by class "aov", distance 2. Class "mlm", by class "aov", distance 2, with explicit test and coerce. Class "oldClass", by class "aov", distance 3. Class "oldClass", by class "aov", distance 4, with explicit test and coerce.


No methods defined with class "ancova" in the signature. S3-type methods are "anova.ancova", "coef.ancova", "coefficients.ancova", "model.frame.ancova", "plot.ancova", "predict.ancova", "print.ancova", "summary.ancova". "plot.ancova(x)" plots a standard lm plot of x. "print.ancova(x)" prints the anova(x) and the trellis attribute. The remaining methods use NextMethod.


Richard M. Heiberger <>


Heiberger, Richard M. and Holland, Burt (2004b). Statistical Analysis and Data Display: An Intermediate Course with Examples in S-Plus, R, and SAS. Springer Texts in Statistics. Springer. ISBN 0-387-40270-5.

See Also


Search within the HH package
Search all R packages, documentation and source code

Questions? Problems? Suggestions? or email at

Please suggest features or report bugs with the GitHub issue tracker.

All documentation is copyright its authors; we didn't write any of that.