Incorrect quantile computation.

[jerome-benoit]

The implementation borrowed from mitata is incorrect and off by at least one for all quantiles.

Correct implementation:

const quantile = (arr, q) => {
  const base = (arr.length - 1) * q;
  const baseIndex = Math.floor(base);
  if (arr[baseIndex + 1] != null) {
    return (
      arr[baseIndex] +
      (base - baseIndex) * (arr[baseIndex + 1] - arr[baseIndex])
    );
  }
  return arr[baseIndex];
};

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[Aslemammad]

Interesting, could you send a PR with a test?