[jira] [Commented] (MATH-1401) Exception at IntervalUtils.getClopperPearsonInterval

[Bruno P. Kinoshita (JIRA)]

    [ 
https://issues.apache.org/jira/browse/MATH-1401?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15994384#comment-15994384
 ] 

Bruno P. Kinoshita commented on MATH-1401:
------------------------------------------

With the latest code from master today 
(dff1a0953d97d46290750a46d01be1e1519ae698):

{code}
ConfidenceInterval ci = IntervalUtils.getClopperPearsonInterval(1, 0, 0.95);
{code}

Throws:

{noformat}
Exception in thread "main" 
org.apache.commons.math4.exception.MathIllegalArgumentException: lower bound 
(0) must be strictly less than upper bound (0)
        at 
org.apache.commons.math4.stat.interval.ConfidenceInterval.checkParameters(ConfidenceInterval.java:103)
        at 
org.apache.commons.math4.stat.interval.ConfidenceInterval.<init>(ConfidenceInterval.java:57)
        at 
org.apache.commons.math4.stat.interval.ClopperPearsonInterval.createInterval(ClopperPearsonInterval.java:56)
        at 
org.apache.commons.math4.stat.interval.IntervalUtils.getClopperPearsonInterval(IntervalUtils.java:104)
{noformat}

And:

{code}
ConfidenceInterval ci = IntervalUtils.getClopperPearsonInterval(1, 1, 0.95);
{code}

Throws:

{noformat}
Exception in thread "main" 
org.apache.commons.math4.exception.NotStrictlyPositiveException: degrees of 
freedom (0)
        at 
org.apache.commons.math4.distribution.FDistribution.<init>(FDistribution.java:85)
        at 
org.apache.commons.math4.distribution.FDistribution.<init>(FDistribution.java:63)
        at 
org.apache.commons.math4.stat.interval.ClopperPearsonInterval.createInterval(ClopperPearsonInterval.java:49)
        at 
org.apache.commons.math4.stat.interval.IntervalUtils.getClopperPearsonInterval(IntervalUtils.java:104)
{noformat}

> Exception at IntervalUtils.getClopperPearsonInterval
> ----------------------------------------------------
>
>                 Key: MATH-1401
>                 URL: https://issues.apache.org/jira/browse/MATH-1401
>             Project: Commons Math
>          Issue Type: Bug
>    Affects Versions: 3.6.1
>            Reporter: Art
>             Fix For: 4.0
>
>
> IntervalUtils.getClopperPearsonInterval throws an exception when number of 
> successes equals to zero or number of successes = number of trials.
> IntervalUtils.getClopperPearsonInterval(1, 0, 0.95) or 
> IntervalUtils.getClopperPearsonInterval(1, 1, 0.95) throws 
> org.apache.commons.math3.exception.NotStrictlyPositiveException despite that 
> its input parameters are valid. 
>  



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