Dmitriy created MATH-1178:
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Summary: Incorrect sample of usage of StatUtils at homepage
Key: MATH-1178
URL: https://issues.apache.org/jira/browse/MATH-1178
Project: Commons Math
Issue Type: Bug
Environment: Documentation at
http://commons.apache.org/proper/commons-math/userguide/stat.html
Reporter: Dmitriy
Priority: Trivial
At http://commons.apache.org/proper/commons-math/userguide/stat.html you are
providing three ways to compute mean, std, median with DescriptiveStatistics,
SummaryStatistics, StatUtils.
But when you execute double std = StatUtils.variance(values), you are not
actually get std in std, you get std*std, because DescriptiveStatistics
actually returns FastMath.sqrt(getVariance()), but StatUtils returns variance
directly.
The solution is to substitute "double std = StatUtils.variance(values);" with
"double std = FastMath.sqrt(StatUtils.variance(values));"
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