agi.foundation

(agi.foundation.core-2025r1.jar)

Class DescriptiveStatistics

java.lang.Object

agi.foundation.DescriptiveStatistics

public final class DescriptiveStatistics
extends Object

Provides descriptive statistic methods.

Method Summary

Modifier and Type	Method and Description
static double	mean(List<Double> dataList) Calculates the mean of a list of doubles.
static double	median(List<Double> dataList) Calculates the median of a list of doubles.
static <T> T	percentile(List<T> dataList, double percentile) Returns the nth percentile value from the list.
static double	rootMeanSquare(List<Double> dataList) Calculates the root mean square (RMS) of a list of doubles.
static double	standardDeviation(List<Double> dataList) Calculates the standard deviation of a list of doubles.
static double	standardDeviationNMinusOne(List<Double> dataList) Calculates the standard deviation of a list of doubles using the N-1 algorithm.
static double	standardError(List<Double> dataList) The standard error is the Standard deviation of the mean.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Detail

rootMeanSquare

public static double rootMeanSquare(@Nonnull
                                    List<Double> dataList)

Calculates the root mean square (RMS) of a list of doubles.

Parameters:

dataList - The list of doubles to use to calculate the RMS.

Returns:

The root mean square value.

Throws:

ArgumentNullException - Thrown when dataList is null.

ArgumentException - Thrown when dataList is empty.

mean

public static double mean(@Nonnull
                          List<Double> dataList)

Calculates the mean of a list of doubles.

Parameters:

dataList - The list of doubles to use to calculate the mean.

Returns:

The mean value.

Throws:

ArgumentNullException - Thrown when dataList is null.

ArgumentException - Thrown when dataList is empty.

median

public static double median(@Nonnull
                            List<Double> dataList)

Calculates the median of a list of doubles.

Parameters:

dataList - The list of doubles to use to calculate the median.

Returns:

The median value.

Throws:

ArgumentNullException - Thrown when dataList is null.

ArgumentException - Thrown when dataList is empty.

standardDeviation

public static double standardDeviation(@Nonnull
                                       List<Double> dataList)

Calculates the standard deviation of a list of doubles.

Parameters:

dataList - The list of doubles to use to calculate the standard deviation.

Returns:

The standard deviation value.

Throws:

ArgumentNullException - Thrown when dataList is null.

ArgumentException - Thrown when dataList is empty.

standardDeviationNMinusOne

public static double standardDeviationNMinusOne(@Nonnull
                                                List<Double> dataList)

Calculates the standard deviation of a list of doubles using the N-1 algorithm. If dataList has one element, returns DescriptiveStatistics.standardDeviation(List).

Parameters:

dataList - The list of doubles to use to calculate the standard deviation (N-1).

Returns:

The (N-1) standard deviation value.

Throws:

ArgumentNullException - Thrown when dataList is null.

ArgumentException - Thrown when dataList is empty.

standardError

public static double standardError(@Nonnull
                                   List<Double> dataList)

The standard error is the Standard deviation of the mean. This implementation uses the DescriptiveStatistics.standardDeviationNMinusOne(List) method.

Parameters:

dataList - The list of doubles to use to calculate the standard error.

Returns:

The standard error value.

Throws:

ArgumentNullException - Thrown when dataList is null.

ArgumentException - Thrown when dataList is empty.

percentile

public static <T> T percentile(@Nonnull
                               List<T> dataList,
                               double percentile)

Returns the nth percentile value from the list. The list is assumed to be sorted.

Type Parameters:

T - The type of element in the list.

Parameters:

dataList - The sorted list from which to find the nth value.

percentile - The percentile you seek (1-100).

Returns:

The nth percentile value from the sorted list.

Throws:

ArgumentNullException - Thrown when dataList is null.

ArgumentException - Thrown when dataList is empty.

ArgumentOutOfRangeException - Thrown when the parameter percentile is not between 1 and 100.