is.maximal {arules}

Find Maximal Itemsets

Description

Provides the generic function is.maximal() and methods for finding maximal itemsets. Maximal frequent itemsets are used as a concise representation of frequent itemsets. An itemset is maximal in a set if no proper superset of the itemset is contained in the set (Zaki et al., 1997).

Usage

is.maximal(x, ...)

## S4 method for signature 'itemMatrix'
is.maximal(x)

## S4 method for signature 'itemsets'
is.maximal(x)

## S4 method for signature 'rules'
is.maximal(x)

Arguments

x

the set of itemsets, rules or an itemMatrix object.

...

further arguments.

Details

Maximally frequent itemsets can also be mined directly using apriori() or eclat() with target "maximally frequent itemsets".

We define here maximal rules, as the rules generated by maximal itemsets.

Value

a logical vector with the same length as x indicating for each element in x if it is a maximal itemset.

Author(s)

Michael Hahsler

References

Mohammed J. Zaki, Srinivasan Parthasarathy, Mitsunori Ogihara, and Wei Li (1997). New algorithms for fast discovery of association rules. Technical Report 651, Computer Science Department, University of Rochester, Rochester, NY 14627.

See Also

Other postprocessing: is.closed(), is.generator(), is.redundant(), is.significant(), is.superset()

Other associations functions: abbreviate(), associations-class, c(), duplicated(), extract, inspect(), is.closed(), is.generator(), is.redundant(), is.significant(), is.superset(), itemsets-class, match(), rules-class, sample(), sets, size(), sort(), unique()