Package org.apache.pinot.segment.local.customobject

Class PinotFourthMoment

java.lang.Object

org.apache.commons.math.stat.descriptive.AbstractUnivariateStatistic

org.apache.commons.math.stat.descriptive.AbstractStorelessUnivariateStatistic

org.apache.commons.math.stat.descriptive.moment.FirstMoment

org.apache.commons.math.stat.descriptive.moment.SecondMoment

org.apache.commons.math.stat.descriptive.moment.ThirdMoment

org.apache.commons.math.stat.descriptive.moment.FourthMoment

org.apache.pinot.segment.local.customobject.PinotFourthMoment

All Implemented Interfaces:

Serializable, Comparable<PinotFourthMoment>, org.apache.commons.math.stat.descriptive.StorelessUnivariateStatistic, org.apache.commons.math.stat.descriptive.UnivariateStatistic

public class PinotFourthMoment
extends org.apache.commons.math.stat.descriptive.moment.FourthMoment
implements Comparable<PinotFourthMoment>

A Comparable implementation of the Fourth Statistical Moment that uses the apache commons algorithm for computing it in one pass. It additionally supports serialization and deserialization methods, which is helpful for combining moments across servers.

The commons implementation does not support parallel-computation, support for which is added in the combine(PinotFourthMoment) method inspired by Presto's implementation.

 Also See: Presto's Implementation
 

See Also:

Serialized Form

Field Summary

Fields inherited from class org.apache.commons.math.stat.descriptive.moment.FourthMoment

m4

Fields inherited from class org.apache.commons.math.stat.descriptive.moment.ThirdMoment

m3, nDevSq

Fields inherited from class org.apache.commons.math.stat.descriptive.moment.SecondMoment

m2

Fields inherited from class org.apache.commons.math.stat.descriptive.moment.FirstMoment

dev, m1, n, nDev

Constructor Summary

Constructors

Constructor	Description
PinotFourthMoment()

Method Summary

Modifier and Type	Method	Description
void	combine(long bN, double bM1, double bM2, double bM3, double bM4)
void	combine(PinotFourthMoment other)
int	compareTo(PinotFourthMoment o)
static PinotFourthMoment	fromBytes(byte[] bytes)
static PinotFourthMoment	fromBytes(ByteBuffer buff)
double	kurtosis()
byte[]	serialize()
double	skew()

Methods inherited from class org.apache.commons.math.stat.descriptive.moment.FourthMoment

clear, copy, copy, getResult, increment

Methods inherited from class org.apache.commons.math.stat.descriptive.moment.ThirdMoment

copy

Methods inherited from class org.apache.commons.math.stat.descriptive.moment.SecondMoment

copy

Methods inherited from class org.apache.commons.math.stat.descriptive.moment.FirstMoment

copy, getN

Methods inherited from class org.apache.commons.math.stat.descriptive.AbstractStorelessUnivariateStatistic

equals, evaluate, evaluate, hashCode, incrementAll, incrementAll

Methods inherited from class org.apache.commons.math.stat.descriptive.AbstractUnivariateStatistic

test, test

Methods inherited from class java.lang.Object

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

Constructor Detail

PinotFourthMoment

public PinotFourthMoment()

Method Detail

combine

public void combine(PinotFourthMoment other)

combine

public void combine(long bN,
                    double bM1,
                    double bM2,
                    double bM3,
                    double bM4)

skew

public double skew()

kurtosis

public double kurtosis()

serialize

public byte[] serialize()

fromBytes

public static PinotFourthMoment fromBytes(byte[] bytes)

fromBytes

public static PinotFourthMoment fromBytes(ByteBuffer buff)

compareTo

public int compareTo(PinotFourthMoment o)

Specified by:

compareTo in interface Comparable<PinotFourthMoment>