# ancova-class

##### Class "ancova" Analysis of Covariance

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.

- Keywords
- classes

##### Objects from the Class

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

##### Extends

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.

##### Methods

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`

.

##### References

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

*Documentation reproduced from package HH, version 3.1-8, License: GPL (>= 2)*