update.xtabs | R Documentation |
xtabs
object
Provides an update
method for "xtabs"
objects,
typically by removing terms from the formula to collapse over them.
## S3 method for class 'xtabs'
update(object, formula., ..., evaluate = TRUE)
object |
An existing |
formula. |
Changes to the formula ? see |
... |
Additional arguments to the call, or arguments with changed values. |
evaluate |
If |
If evaluate == TRUE
, the new "xtabs"
object, otherwise the updated call
Michael Friendly
update.formula
for details on updates to model formulae
margin.table
does something similar,
collapse.table
collapses category levels
vietnam.tab <- xtabs(Freq ~ sex + year + response, data=Vietnam)
update(vietnam.tab, formula = ~ . -year)
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