# ancova-class: Class "ancova" Analysis of Covariance In HH: Statistical Analysis and Data Display: Heiberger and Holland

 ancova-class R Documentation

## Class "ancova" Analysis of Covariance

### Description

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.

### 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`.

### Author(s)

Richard M. Heiberger <rmh@temple.edu>

### References

Heiberger, Richard M. and Holland, Burt (2015). Statistical Analysis and Data Display: An Intermediate Course with Examples in R. Second Edition. Springer-Verlag, New York. https://link.springer.com/book/10.1007/978-1-4939-2122-5

`ancova`