anova                  package:base                  R Documentation

Anova Tables

Description:

     Compute analysis of variance (or deviance) tables for one or more
     fitted model objects.

Usage:

     anova(object, ...)

Arguments:

  object: an object containing the results returned by a model fitting
          function (e.g. `lm' or `glm').

     ...: additional objects of the same type.

Value:

     This (generic) function returns an object of class `anova'. These
     objects represent analysis-of-variance and analysis-of-deviance
     tables. When given a single argument it produces a table which
     tests whether the model terms are significant.

     When given a sequence of objects, `anova' tests the models against
     one another in the order specified.

     The print method for `anova' objects prints tables in a ``pretty''
     form.

Warning:

     The comparison between two or more models will only be valid if
     they are fitted to the same dataset. This may be a problem if
     there are missing values and R's default of `na.action = na.omit'
     is used.

See Also:

     `coefficients', `effects', `fitted.values', `residuals',
     `summary'.

