coverage {arules} | R Documentation |
Provides the generic function and the needed S4 method to calculate the coverage (support of the left-hand-side) of rules.
coverage(x, transactions = NULL, reuse = TRUE)
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? |
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.
A numeric vector of the same length as x
containing
the coverage values for the sets in x
.
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)