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Table 4 Combination of contingency tables for three data sets (t ij = a ij + b ij + c ij )

From: Improving the prediction accuracy in classification using the combined data sets by ranks of gene expressions

  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
  1. P1, P2 and P3 represent the three different phenotypes. E1, E2 and E3 represent three groups by ranks of gene expressions. aij, bij and cij are the numbers of experiments belong to Pj and Ei at the same time in data A, data B and data C, respectively.