Package org.apache.commons.math3.stat.descriptive

Generic univariate summary statistic objects.

See:
Description

Interface Summary

StatisticalMultivariateSummary	Reporting interface for basic multivariate statistics.
StatisticalSummary	Reporting interface for basic univariate statistics.
StorelessUnivariateStatistic	Extends the definition of UnivariateStatistic with StorelessUnivariateStatistic.increment(double) and StorelessUnivariateStatistic.incrementAll(double[]) methods for adding values and updating internal state.
UnivariateStatistic	Base interface implemented by all statistics.
WeightedEvaluation	Weighted evaluation for statistics.

Class Summary

AbstractStorelessUnivariateStatistic	Abstract implementation of the StorelessUnivariateStatistic interface.
AbstractUnivariateStatistic	Abstract base class for all implementations of the UnivariateStatistic interface.
AggregateSummaryStatistics	An aggregator for SummaryStatistics from several data sets or data set partitions.
DescriptiveStatistics	Maintains a dataset of values of a single variable and computes descriptive statistics based on stored data.
MultivariateSummaryStatistics	Computes summary statistics for a stream of n-tuples added using the addValue method.
StatisticalSummaryValues	Value object representing the results of a univariate statistical summary.
SummaryStatistics	Computes summary statistics for a stream of data values added using the addValue method.
SynchronizedDescriptiveStatistics	Implementation of DescriptiveStatistics that is safe to use in a multithreaded environment.
SynchronizedMultivariateSummaryStatistics	Implementation of MultivariateSummaryStatistics that is safe to use in a multithreaded environment.
SynchronizedSummaryStatistics	Implementation of SummaryStatistics that is safe to use in a multithreaded environment.

Package org.apache.commons.math3.stat.descriptive Description

Generic univariate summary statistic objects.

UnivariateStatistic API Usage Examples:

UnivariateStatistic:

/∗ evaluation approach ∗/
double[] values = new double[] { 1, 2, 3, 4, 5 };
UnivariateStatistic stat = new Mean();
out.println("mean = " + stat.evaluate(values));


StorelessUnivariateStatistic:

/∗ incremental approach ∗/
double[] values = new double[] { 1, 2, 3, 4, 5 };
StorelessUnivariateStatistic stat = new Mean();
out.println("mean before adding a value is NaN = " + stat.getResult());
for (int i = 0; i < values.length; i++) {
stat.increment(values[i]);
out.println("current mean = " + stat2.getResult());
}
stat.clear();
out.println("mean after clear is NaN = " + stat.getResult());