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From "Luc Maisonobe (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (MATH-568) Code in Userguide for Statistics wrong or deprecated
Date Sun, 05 Jun 2011 15:43:47 GMT

     [ https://issues.apache.org/jira/browse/MATH-568?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Luc Maisonobe resolved MATH-568.
--------------------------------

       Resolution: Fixed
    Fix Version/s: 3.0

Fixed in subversion repository as of r1132437.

Thanks for the report and the patch.

> Code in Userguide for Statistics wrong or deprecated 
> -----------------------------------------------------
>
>                 Key: MATH-568
>                 URL: https://issues.apache.org/jira/browse/MATH-568
>             Project: Commons Math
>          Issue Type: Improvement
>    Affects Versions: 2.2
>         Environment: windows 7
>            Reporter: Christoph M. Friedrich
>            Priority: Trivial
>              Labels: documentation
>             Fix For: 3.0
>
>   Original Estimate: 0.05h
>  Remaining Estimate: 0.05h
>
> The code for the Statistics examples is not running and can easily be fixed. Example:
> // Get a DescriptiveStatistics instance
> DescriptiveStatistics stats = new DescriptiveStatistics();
> // Add the data from the array
> for( int i = 0; i < inputArray.length; i++) {
>         stats.addValue(inputArray[i]);
> }
> // Compute some statistics
> double mean = stats.getMean();
> double std = stats.getStandardDeviation();
> double median = stats.getMedian();
> Fails with getMedian not found, change to getPercentile(50);
> The second Codeexample for StatuUtils states:
> // Compute statistics directly from the array
> // assume values is a double[] array
> double mean = StatUtils.mean(values);
> double std = StatUtils.variance(values);
> double median = StatUtils.percentile(50);
> the last line needs to be changed to: double median = StatUtils.percentile(values,50);

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