| crossTable {arules} | R Documentation |
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 signature 'itemMatrix'
crossTable(
x,
measure = c("count", "support", "probability", "lift"),
sort = FALSE
)
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. |
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.
Author(s)
Michael Hahsler
See Also
Other itemMatrix and transactions functions:
abbreviate(),
c(),
duplicated(),
extract,
hierarchy,
image(),
inspect(),
is.superset(),
itemFrequencyPlot(),
itemFrequency(),
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]