@Test
//@Ignore
public void testMean() {

    SarimaSpecification spec = new SarimaSpecification(12);
    spec.airline();
    spec.setBP(1);
    spec.setBD(0);
    SarimaModel arima = new SarimaModel(spec);
    arima.setBPhi(1, -.9);
    FastArimaForecasts fcasts = new FastArimaForecasts(arima, true);
    double[] f1 = fcasts.forecasts(x1, 24);
      System.out.println(new DataBlock(f1));
      System.out.println("mean:" + fcasts.getMean());
}