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Sriram Natarajan commented on MATH-1185: ---------------------------------------- Point noted re CDF vs. Q (1- CDF). So this library will have the same issue then (resolution in doubles close to 1). If I find anything of interest in the tests, I will update this thread. > Tail probability drops to zero beyond 10e-17 ? > ---------------------------------------------- > > Key: MATH-1185 > URL: https://issues.apache.org/jira/browse/MATH-1185 > Project: Commons Math > Issue Type: Wish > Affects Versions: 3.3, 3.4 > Reporter: Sriram Natarajan > Priority: Minor > > This could be a simple question, In which case I can expect a clarification. > If this is the wrong place to post such a question, let me know. > OS: Windows 8.1, Java 1.8.0_25 > ChiSquaredDistribution chisq = new ChiSquaredDistribution(23) > 1.0 - chisq.cumulativeProbability(130) is 1.1102230246251565E-16 > 1.0 - chisq.cumulativeProbability(131) is 0.0 > Am pretty sure it is not a formatting issue. Is there a reason why the tail > drops to zero at this point? -- This message was sent by Atlassian JIRA (v6.3.4#6332)