anova
Anova Tables
Description
Computes an ANOVA type object.
This function is an S Version 3 generic.
Method functions for the classes
glm, lm, lmlist and loess are included.
Usage
anova(object, ...)
Arguments
| object |
a model object, such as the object created by lm, glm,
or aov.
|
| ... |
More model objects similar to the first plus
additional arguments passed to or from other methods.
In particular, many methods implement a test argument
with choices such as "none" (or NULL), "F", "Chi", and "Cp".
|
Details
If you call anova with a single object as an argument,
anova produces a table with rows corresponding to each of the
terms in the object, plus an additional row for the residuals. The
method for aov objects is similar to summary.
When two or more objects are used in the call, a similar table is produced that shows the effects of the pairwise differences between the models, considered sequentially from first to last.
Value
returns an anova object.
The anova class of object inherits from the class "data.frame",
and acts much like a data.frame in most respects but has a special
print method for it.
The "heading" attribute, a character vector that is printed
at the top of the table, is also included.
References
Chambers, J.M., and Hastie, T.J. (1991). Statistical Models in S. London: Chapman and Hall.
See Also
Examples
glm.object <- glm(Kyphosis ~ Start + Number, family = binomial,
data = Sdatasets::kyphosis)
anova(glm.object)
ff.mod.1 <- lm(Fuel ~ Weight, data=Sdatasets::fuel.frame)
ff.mod.2 <- lm(Fuel ~ Weight + Disp., data=Sdatasets::fuel.frame)
anova(ff.mod.1, ff.mod.2)