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Maciej Kwidziński commented on MATH-1462: ----------------------------------------- I added a [repro test|https://github.com/apache/commons-math/pull/198]. > EmpiricalDistribution:inverseCumulativeProbability return Infinity > ------------------------------------------------------------------ > > Key: MATH-1462 > URL: https://issues.apache.org/jira/browse/MATH-1462 > Project: Commons Math > Issue Type: Bug > Affects Versions: 3.6.1 > Reporter: elyes belarbi > Assignee: Amar Prakash Pandey > Priority: Critical > Attachments: Screenshot from 2021-07-03 00-31-54.png, Screenshot from > 2021-07-03 00-34-23.png > > > Hi, > inverseCumulativeProbability(0.5) return "infinity" which is absurd while it > return correct values for 0.499999 and 0.511111, Here is the test : > {code:java} > double[] data = {6464.0205, 6449.1328, 6489.4569, 6497.5533, 6251.6487, > 6252.6513, 6339.7883, > 6356.2622, 6222.1251, 6157.3813, 6242.4741, 6332.5347, 6468.0633, 6471.2319, > 6473.9929, 6589.1322, > 6511.2191, 6339.4349, 6307.7735, 6288.0915, 6354.0572, 6385.8283, 6325.3756, > 6433.1699, 6433.6507, > 6424.6806, 6380.5268, 6407.6705, 6241.2198, 6230.3681, 6367.5943, 6358.4817, > 6272.8039, 6269.0211, > 6312.9027, 6349.5926, 6404.0775, 6326.986, 6283.8685, 6309.9021, 6336.8554, > 6389.1598, 6281.0372, > 6304.8852, 6359.2651, 6426.519, 6400.3926, 6440.6798, 6292.5812, 6398.4911, > 6307.0002, 6284.2111, 6271.371, 6368.6377, 6323.3372, 6276.2155, > 6335.0117, 6319.2466, 6252.9969, 6445.2074, 6461.3944, 6384.1345}; > EmpiricalDistribution ed = new EmpiricalDistribution(data.length); > ed.load(data); > double p50 = ed.inverseCumulativeProbability(0.5); > double p51 = ed.inverseCumulativeProbability(0.51111); > double p49 = ed.inverseCumulativeProbability(0.49999); > assertTrue(p51<6350); > assertTrue(p49<6341); > assertTrue(p50<7000); > {code} > Any clue to fix this ? > -- This message was sent by Atlassian Jira (v8.3.4#803005)