sum package:statistics

sum :: Vector v Double => v Double -> Double
statistics Statistics.Sample.Internal
sum :: Powers -> Double
statistics Statistics.Sample.Powers
The sum of elements in the original Sample. This is the sample's first simple power.
sumProbabilities :: DiscreteDistr d => d -> Int -> Int -> Double
statistics Statistics.Distribution
Sum probabilities in inclusive interval.
robustSumVar :: Vector v Double => Double -> v Double -> Double
statistics Statistics.Sample.Internal
wilcoxonRankSums :: (Ord a, Unbox a) => Vector a -> Vector a -> (Double, Double)
statistics Statistics.Test.MannWhitneyU
The Wilcoxon Rank Sums Test. This test calculates the sum of ranks for the given two samples. The samples are ordered, and assigned ranks (ties are given their average rank), then these ranks are summed for each sample. The return value is (W₁, W₂) where W₁ is the sum of ranks of the first sample and W₂ is the sum of ranks of the second sample. This test is trivially transformed into the Mann-Whitney U test. You will probably want to use mannWhitneyU and the related functions for testing significance, but this function is exposed for completeness.