@Test
public void testRollingMean() {

  double[] data = new double[] {1, 2, 3, 4, 5, 6, 7, 8, 9, 10};
  double missing = DoubleColumnType.missingValueIndicator();
  double[] sma5 = new double[] {missing, missing, missing, missing, 3, 4, 5, 6, 7, 8};
  DoubleColumn result = DoubleColumn.create("data", data).rolling(5).mean();
  assertArrayEquals(sma5, result.asDoubleArray(), 0.000001);
  assertEquals("data 5-period Mean", result.name());
}