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https://issues.apache.org/jira/browse/MATH-540?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13003103#comment-13003103
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Ole Ersoy commented on MATH-540:
--------------------------------
I'm looking at it like this. I have very simple distribution like the one
provided (Four sided dice). I'm trying to write a simulation that draws values
of x for a a set of uniform 0-1 probabilities. So I'm expecting:
0 When p is less than or equal to 0.25
1 When p is greater than 0.25 but less than or equal to 0.50
2 When p is greater than 0.50 but less than or equal to 0.75
3 When p is greater than 0.75 but less than or equal to 1.0
So for the line
int neverSucceeds = d.inverseCumulativeProbability(0.0001);
I'm really expecting 0 to be returned.
Make sense?
> AbstractIntegerDistribution.inverseCumulativeProbability(...) Bug
> -----------------------------------------------------------------
>
> Key: MATH-540
> URL: https://issues.apache.org/jira/browse/MATH-540
> Project: Commons Math
> Issue Type: Bug
> Affects Versions: 2.1
> Reporter: Ole Ersoy
> Fix For: 3.0
>
> Attachments: DummyDiscreteDistribution.java,
> DummyDiscreteDistributionTest.java
>
>
> The AbstractIntegerDistribution.inverseCumulativeProbability(...) function
> attempts to decrement the lower bound of discrete distributions to values
> that go below the lower bound.
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