@Test
void testPercentileFunctions() {

  double[] values = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10};
  DoubleColumn c = DoubleColumn.create("test", values);
  c.appendCell("");
  assertEquals(1, countMissing.summarize(c), 0.0001);
  assertEquals(11, countWithMissing.summarize(c), 0.0001);
  assertEquals(StatUtils.percentile(values, 90), percentile90.summarize(c), 0.0001);
  assertEquals(StatUtils.percentile(values, 95), percentile95.summarize(c), 0.0001);
  assertEquals(StatUtils.percentile(values, 99), percentile99.summarize(c), 0.0001);
  assertEquals(10, countUnique.summarize(c), 0.0001);
}