This function is called by RankAggregator::consensusRanking.
For each pair of Items, whenever both Items are ranked by the
same Reviewer, this function sums the occurances when each of the two
Items is preferred to the other.
Usage
evaluationMatrix(x)
Arguments
x
a data.frame containing columns titled Reviewer, Item,
Ranking. On data structure, Reviewer and Item must be
character, and Ranking must be numeric. Each row of x
identifes the rank position that a single Reviewer awarded a single
Item
Value
An m x n pairwise matrix giving the number of times
Item[m] is preferred to (i.e. receives a ranking value lower than)
Item[n] across all ReviewerRankings