The P-values and Z-scores in the Gene Ontology view are determined using the hypergeometric probability distribution.
The function to calculate the P-value is:
Where N is the total number of genes in the project; n is the number of genes in the current gene selection; m is the total number of genes in the project for a given classification term; and k is the number of genes for the classification term in the current gene selection.
The function to calculate the Z-score is:
Where N is the total number of genes in the project; n is the number of genes in the current gene selection; R is the total number of genes in the project for a given classification term; and r is the number of genes for the classification term in the current gene selection.