Compute analysis of variance (or deviance) tables for one or more fitted model objects.
anova(object, …)an object containing the results returned by a model
fitting function (e.g., lm or glm).
additional objects of the same type.
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.
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.
Chambers, J. M. and Hastie, T. J. (1992) Statistical Models in S, Wadsworth & Brooks/Cole.
coefficients, effects,
fitted.values, residuals,
summary, drop1, add1.