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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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