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. 2012 Oct 12;7(10):e45685. doi: 10.1371/journal.pone.0045685

Table 1. Contingency table between two clustering U and V.

V 1 V 2 … V c Sums
U 1 n 11 n 12 … n 1c a 1
U 2 n 21 n 22 … n 2c a 2
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UR nR 1 n R2 … nRC a R
Sums b 1 b 2 … bc N

a i and b i are the numbers of samples in the i-th clusters Ui of U and V i of V respectively and n ij the number of samples in the i-th cluster Ui of U and the j-th cluster V j of V.