Table 3

Contingency table (with margins) for DNA motifs

A

C

G

T

-

X

N_XA

N_XC

N_XG

N_XT

N_X

Y

N_YA

N_YC

N_YG

N_YT

N_Y

N_A

N_C

N_G

N_T

N

This table is used for computing columnwise scores for Pearson χ² and for Fisher-Irwin exact test. A similar table with 20 columns is used for protein motifs.

Gupta et al. Genome Biology 2007 8:R24   doi:10.1186/gb-2007-8-2-r24