Table 1.

Contingency table for scoring bridges

	c i	${\overline{\mathit{c}}}_{\mathit{i}}$
c j	n i,j	nj -ni,j
${\overline{c}}_j$	n i -n i,j	N Col -n i -n j

The contingency table accounts for the number of observations of present (i.e., c_i and c_j) and/or absent (i.e., ${\overline{c}}_i$ and ${\overline{c}}_j$) concepts in facts.