Cross-tabulate joint occurrences across pairs of items
Provides the generic function crossTable
and the S4 method to
cross-tabulate joint occurrences across pairs of items.
crossTable(x, ...) ## S4 method for signature 'itemMatrix' crossTable(x, measure = c("count", "support", "probability", "lift", "chiSquared"), sort = FALSE)
x |
object to be cross-tabulated
( |
measure |
measure to return. Default is co-occurence counts. |
sort |
sort the items by support. |
... |
aditional arguments. |
A symmetric matrix of n time n, where n is the number of items times
in x
. The matrix contains the co-occurrence counts between pairs of
items.
Michael Hahsler
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] chi2 <- crossTable(Groceries, measure="chiSquared", sort=TRUE) chi2[1:5,1:5]
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