adjacency: Create an Adjacency Matrix for a set of Rankings
Description
Convert a set of rankings to an adjacency matrix summarising wins
and losses between pairs of items.
Usage
adjacency(object, weights = NULL, ...)
Value
An N by N matrix, where N is the number of items that can be ranked.
Arguments
object
a rankings object, or an object that can be
coerced by as.rankings.
weights
an optional vector of weights for the rankings.
...
further arguments passed to/from methods.
Details
For a "rankings" object based on N items, the adjacency matrix is an
N by N matrix, with element (i, j) being the number of times item i wins over
item j. For example, in the ranking \1\ > \3, 4\ > \2\,
item 1 wins over items 2, 3, and 4, and items 3 and 4 win over item 2.
If weights is specified, the values in the adjacency matrix are the
weighted counts.