From: Statistical methods on detecting differentially expressed genes for RNA-seq data
Condition 1
∑ j = 1 n 1 x 1 j
∑ j = 1 n 1 m 1 j - ∑ j = 1 n 1 x 1 j
Condition 2
∑ j = 1 n 2 x 2 j
∑ j = 1 n 2 m 2 j - ∑ j = 1 n 2 x 2 j