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Table 7 2 × 4 contingency table for gene pairs of vertical comparison

From: Informative gene selection and the direct classification of tumors based on relative simplicity

Class

X.  j  > EP j  & X.  q  > EP q

X.  j  > EP j  & X.  q  < EP q

X.  j  < EP j  & X.  q  > EP q

X.  j  < EP j  & X.  q  < EP q

Total

+

f+1

f+2

f+3

f+4

f+

-

f−1

f−2

f−3

f−4

f−

Total

f1

f2

f3

f4

n

  1. f+1 is the number of positive samples with X. j larger than EP j and X. q larger than EP q , f+2 is the number of positive samples with X. j larger than EP j and X. q less than EP q , f+3 is the number of positive samples with X. j less than EP j and X. q larger than EP q , f+4 is the number of positive samples with X. j less than EP j and X. q less than EP q , f−1 is the number of positive samples with X. j larger than EP j and X. q larger than EP q , f−2 is the number of positive samples with X. j larger than EP j and X. q less than EP q , f−3 is the number of positive samples with X. j less than EP j and X. q larger than EP q , and f−4 is the number of positive samples with X. j less than EP j and X. q less than EP q