update.xtabs {vcdExtra} | R Documentation |
Update method for a xtabs
object
Description
Provides an update
method for "xtabs"
objects,
typically by removing terms from the formula to collapse over them.
Usage
## S3 method for class 'xtabs'
update(object, formula., ..., evaluate = TRUE)
Arguments
object |
An existing |
formula. |
Changes to the formula ? see |
... |
Additional arguments to the call, or arguments with changed values. |
evaluate |
If |
Value
If evaluate == TRUE
, the new "xtabs"
object, otherwise the updated call
Author(s)
Michael Friendly
See Also
update.formula
for details on updates to model formulae
margin.table
does something similar,
collapse.table
collapses category levels
Examples
vietnam.tab <- xtabs(Freq ~ sex + year + response, data=Vietnam)
update(vietnam.tab, formula = ~ . -year)
[Package vcdExtra version 0.8-5 Index]