Code in Userguide for Statistics wrong or deprecated
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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
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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