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https://issues.apache.org/jira/browse/MATH-1296?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15035696#comment-15035696
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Gilles commented on MATH-1296:
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The documentation is wrong (in {{DescriptiveStatistics}} and in
{{GeometricMean}} classes).
When one of the values is zero, the [geometric
mean|http://mathworld.wolfram.com/GeometricMean.html] should be 0.
> DescriptiveStatistics return geometric mean as 0 when product of values is
> zero, expected to return NaN
> -------------------------------------------------------------------------------------------------------
>
> Key: MATH-1296
> URL: https://issues.apache.org/jira/browse/MATH-1296
> Project: Commons Math
> Issue Type: Bug
> Affects Versions: 3.4.1
> Reporter: Anmol
> Priority: Trivial
> Labels: easyfix
> Original Estimate: 168h
> Remaining Estimate: 168h
>
> @Test
> public void test() {
> DescriptiveStatistics stats = new DescriptiveStatistics();
> stats.addValue(1);
> stats.addValue(2);
> stats.addValue(4);
> System.out.println(stats.getGeometricMean()); //prints 2
> stats.addValue(0);
> System.out.println(stats.getGeometricMean()); //prints 0,
> expected NaN as per the documentation
> }
> The class in consideration is:
> org.apache.commons.math3.stat.descriptive.DescriptiveStatistics
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