@Test
public void testMath891Array() {
final double[] xArray = new double[] { Double.NaN, 1.9, 2, 100, 3 };
final double[] yArray = new double[] { 10, 2, 10, Double.NaN, 4 };
NaturalRanking ranking = new NaturalRanking(NaNStrategy.REMOVED);
SpearmansCorrelation spearman = new SpearmansCorrelation(ranking);
Assert.assertEquals(0.5, spearman.correlation(xArray, yArray), Double.MIN_VALUE);
}