public void subtract()throws Exception {
Distribution dis0 = new BedGraphBuffer(outRat).getDistributionNonZero();
Distribution dis= dis0.subsetHigherThan(1);
dis= dis.subsetLowerOrEqualTo(dis.quantileBoundaries(10).get(5));
double mean= dis.mean();
double sd= dis.standartDeviation();
double rat= mean+ 1.2 *sd;