. 2008 Jun 16;9:283. doi: 10.1186/1471-2105-9-283

Table 4.

Combination of contingency tables for three data sets (t_ij= a_ij+ b_ij+ c_ij)

	P1	P2	P3			P1	P2	P3			P1	P2	P3			P1	P2	P3
E1	a₁₁	a₁₂	a₁₃		E1	b₁₁	b₁₂	b₁₃		E1	c₁₁	c₁₂	c₁₃		E1	t₁₁	t₁₂	t₁₃
E2	a₂₁	a₂₂	a₂₃	+	E2	b₂₁	b₂₂	b₂₃	+	E2	c₂₁	c₂₂	c₂₃	=	E2	t₂₁	t₂₂	t₂₃
E3	a₃₁	a₃₂	a₃₃		E3	b₃₁	b₃₂	b₃₃		E3	c₃₁	c₃₂	c₃₃		E3	t₃₁	t₃₂	t₃₃
data set A					data set B					data set C					combined data set

P1, P2 and P3 represent the three different phenotypes. E1, E2 and E3 represent three groups by ranks of gene expressions. a_ij, b_ijand c_ijare the numbers of experiments belong to P_jand E_iat the same time in data A, data B and data C, respectively.