void init() {
		// Calculate pvalue cutoff
		scoreCutOff = scoreCutOff();

		//---
		// Calculate Fisher parameters
		//---
		N = D = 0;
		for (String geneId : geneSets.getGenes())
			if (geneSets.hasValue(geneId)) {
				N++;
				if (isTopScore(geneId)) D++;
			}

		if (verbose) Timer.showStdErr("Fisher Exact test parameters:\n\tN : " + N + "\n\tD : " + D);
	}