Before revision:  We propose PNEA, an alternative test based on the hypergeometric distribution . PNEA can be applied also to directed and mixed networks , and our simulations show that it is faster and more powerful than existing NEA tests.
After revision:  We propose NEAT, a test for network enrichment analysis. The test is based on the hypergeometric distribution . PNEA can be applied also to directed and mixed networks , and our simulations show that it is faster and more powerful than existing NEA tests.