widyr (version 0.1.5)

pairwise_count: Count pairs of items within a group

Description

Count the number of times each pair of items appear together within a group defined by "feature." For example, this could count the number of times two words appear within documents).

Usage

pairwise_count(tbl, item, feature, wt = NULL, ...)
pairwise_count_(tbl, item, feature, wt = NULL, ...)

Arguments

tbl

Table

item

Item to count pairs of; will end up in item1 and item2 columns

feature

Column within which to count pairs item2 columns

wt

Optionally a weight column, which should have a consistent weight for each feature

...

Extra arguments passed on to squarely, such as diag, upper, and sort

See Also

squarely()

Examples

library(dplyr)
dat <- tibble(group = rep(1:5, each = 2),
              letter = c("a", "b",
                         "a", "c",
                         "a", "c",
                         "b", "e",
                         "b", "f"))

# count the number of times two letters appear together
pairwise_count(dat, letter, group)
pairwise_count(dat, letter, group, sort = TRUE)
pairwise_count(dat, letter, group, sort = TRUE, diag = TRUE)