BMC Systems Biology

Table 1 The 2x2 table used to calculate the chi-squared statistic.

From: Weighted set enrichment of gene expression data

	Genes on Array	Significant Genes
In Pathway	n₁₁	n₁₂	N_1r = n₁₁ + n₁₂
Not in Pathway	n₂₁	n₂₂	N_2r = n₂₁ + n₂₂
	N_1c = n₁₁+n₂₁	N_2c = n₁₂+n₂₂	N = n₁₁+n₁₂+n₂₁+n₂₂

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