Parameters
		----------
		X : np.array
			Array of word counts, shape (N, 2) where N is the vocab size.  X[:,0] is the
			positive class, while X[:,1] is the negative class. None by default

		Returns
		-------
		np.array of p-values

def get_p_vals(self, X):
		'''
		Parameters
		----------
		X : np.array
			Array of word counts, shape (N, 2) where N is the vocab size.  X[:,0] is the
			positive class, while X[:,1] is the negative class. None by default

		Returns
		-------
		np.array of p-values

		'''
		z_scores = self.get_scores(X[:, 0], X[:, 1])
		return norm.cdf(z_scores)