-- | quintiles 1 through 4
qu1, qu2, qu3, qu4 :: (Robust l, Fractional a, Ord a) => l a a
qu1 = quintile 1
qu1, qu2, qu3, qu4 :: (Robust l, Fractional a, Ord a) => l a a
qu1 = quintile 1
qu1 = quintile 1