
P1

P2

P3
  
P1

P2

P3
  
P1

P2

P3
  
P1

P2

P3


E1

a_{11}

a_{12}

a_{13}
 
E1

b_{11}

b_{12}

b_{13}
 
E1

c_{11}

c_{12}

c_{13}
 
E1

t_{11}

t_{12}

t_{13}

E2

a_{21}

a_{22}

a_{23}

+

E2

b_{21}

b_{22}

b_{23}

+

E2

c_{21}

c_{22}

c_{23}

=

E2

t_{21}

t_{22}

t_{23}

E3

a_{31}

a_{32}

a_{33}
 
E3

b_{31}

b_{32}

b_{33}
 
E3

c_{31}

c_{32}

c_{33}
 
E3

t_{31}

t_{32}

t_{33}

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_{ij} and c_{ij} are the numbers of experiments belong to P_{j} and E_{i} at the same time in data A, data B and data C, respectively.