Given a square matrix giving the results of pairwise comparisons, return
a board object whose rows show the results of the comparisons.
Usage
as.pairwise(x)
Arguments
x
A square matrix
Details
With x an $n$-by-$n$ square matrix, the rows and
columns each correspond to one of $n$ competitors. The
$(i,j)$-th entry the number of times competitor $i$ beats
competitor $j$ (the leading diagonal holds NAs because a
competitor can't play himself).
Function as.pairwise() turns this into a
$n(n-1)/2$-by-$n$ matrix whose rows each correspond to a
pairwise comparison. Any row has exactly two non-NA entries,
in columns $i$ and $j$, that correspond to elements
$(i,j)$ and $(j,i)$ of x. Thus the entry in column
$i$ is the number of times competitor $i$ beats competitor
$j$; and the entry in column $j$ is the number of times
competitor $j$ beats competitor $i$.