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Table 1 2 × 2 contingency table for the one-tail Fisher's exact test

From: RedundancyMiner: De-replication of redundant GO categories in microarray and proteomics analysis

  In first category Not in first category Row sums
In second category {ai} ∩ {bi} {ai}' ∩ {bi} {bi}
Not in second category {ai} ∩ {bi}' {ai}' ∩ {bi}' {bi}'
Column sums {ai} {ai}' {ai} {ai}'
  1. {ai} and {bi} are the sets of genes mapping to the first and second categories, respectively. Prime indicates the complement of a set. {ai} {ai}' represents the set of genes mapping to the root GO category.