vcdExtra (version 0.7-6)

update.xtabs: 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 xtabs
update(object, formula., ..., evaluate = TRUE)

Arguments

object

An existing "xtabs" object

formula.

Changes to the formula ? see update.formula for details

…

Additional arguments to the call, or arguments with changed values.

evaluate

If TRUE, evaluate the new call else return the call

Value

If evaluate == TRUE, the new "xtabs" object, otherwise the updated call

See Also

update.formula for details on updates to model formulae

margin.table does something similar, collapse.table collapses category levels

Examples

# NOT RUN {
vietnam.tab <- xtabs(Freq ~ sex + year + response, data=Vietnam)

update(vietnam.tab, formula = ~ . -year)


# }