arules (version 1.7-9)

crossTable: Cross-tabulate joint occurrences across pairs of items

Description

Provides the generic function crossTable() and a method to cross-tabulate joint occurrences across all pairs of items.

Usage

crossTable(x, ...)
# S4 method for itemMatrix
crossTable(
  x,
  measure = c("count", "support", "probability", "lift"),
  sort = FALSE
)

Value

A symmetric matrix of n x n, where n is the number of items times in x. The matrix contains the co-occurrence counts between pairs of items.

Arguments

x

object to be cross-tabulated (transactions or itemMatrix).

...

additional arguments.

measure

measure to return. Default is co-occurrence counts.

sort

sort the items by support.

Author

Michael Hahsler

See Also

Other itemMatrix and transactions functions: abbreviate(), c(), duplicated(), extract, hierarchy, image(), inspect(), is.superset(), itemFrequency(), itemFrequencyPlot(), itemMatrix-class, match(), merge(), random.transactions(), sample(), sets, size(), supportingTransactions(), tidLists-class, transactions-class, unique()

Examples

data("Groceries")

ct <- crossTable(Groceries, sort = TRUE)
ct[1:5, 1:5]

sp <- crossTable(Groceries, measure = "support", sort = TRUE)
sp[1:5, 1:5]

lift <- crossTable(Groceries, measure = "lift", sort = TRUE)
lift[1:5, 1:5]