neumarcx commented on issue #568: Add Aggregate Median to SPARQL ARQ syntax URL: https://github.com/apache/jena/pull/568#issuecomment-496660571 with regards to the "Commons Median" "the data must be at least partially ordered." question. I did tests with a random set of 1,000,000,000 values and known pivot values. I have used this set to compare Median().evaluate(arrDouble) and descriptiveStatistics.getPercentile(50). Both correctly predict the median in test of 100 runs. I will try to investigate the statement "the data must be at least partially ordered." with the Apache Commons Math people.
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