arules (version 1.0-12)

coverage: Calculate coverage for rules

Description

Provides the generic function and the needed S4 method to calculate the coverage (support of the left-hand-side) of rules.

Usage

coverage(x, transactions = NULL, reuse = TRUE)

Arguments

x

the set of rules.

transactions

the data set used to generate 'x'. Only needed if the quality slot of 'x' does not contain support and confidence.

reuse

reuse support and confidence stored in 'x' or recompute from transactions?

Value

• A numeric vector of the same length as x containing the coverage values for the sets in x.

Details

Coverage is calculated from the rules quality measures (support and confidence) stored in the quality slot or, if these values are not present, as the support of the LHS.

See Also

rules-class

Examples

data("Income")

## find and some rules (we only use 5 rules here) and calculate coverage
rules <- apriori(Income)[1:5]
quality(rules) <- cbind(quality(rules), coverage = coverage(rules))

inspect(rules)