Update method for a xtabs object — update.xtabs • vcdExtra

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 "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

Author

Michael Friendly

Examples


vietnam.tab <- xtabs(Freq ~ sex + year + response, data=Vietnam)

update(vietnam.tab, formula = ~ . -year)
#>         response
#> sex        A   B   C   D
#>   Female  71 105 369  37
#>   Male   730 633 950 252