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