edu.cmu.minorthird.util
Class MathUtil.Accumulator

java.lang.Object
  edu.cmu.minorthird.util.MathUtil.Accumulator

All Implemented Interfaces:

java.io.Serializable

Enclosing class:

MathUtil

public static class MathUtil.Accumulator
extends java.lang.Object
implements java.io.Serializable

Accumulate a list of numbers, then report on mean, standard deviation, and other common statistics.

See Also:

Serialized Form

Constructor Summary

MathUtil.Accumulator()

Method Summary

void	add(double d) Add a new number to the accumulator.
void	addAll(MathUtil.Accumulator b) Combine two accumulators.
double	binomialStdErr() The standard error of binomially distributed values.
void	clear() Clear the accumulator
double	mean() The mean of accumulated values.
double	numberOfValues() The number of accumulated values.
double	populationStdDev() The population standard devation of the accumulated values.
double	stdDev() The sample standard devation of the accumulated values.
double	stdErr() The sample standard error of the accumulated values.
double	variance() The variance of the accumulated values.
double	z(double expected) The Z statistic.

Methods inherited from class java.lang.Object

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

Constructor Detail

MathUtil.Accumulator

public MathUtil.Accumulator()

Method Detail

clear

public void clear()

Clear the accumulator

add

public void add(double d)

Add a new number to the accumulator.

addAll

public void addAll(MathUtil.Accumulator b)

Combine two accumulators. Result will be be as if every call b.add(x) had been followed by a call to this.add(x).

mean

public double mean()

The mean of accumulated values.

numberOfValues

public double numberOfValues()

The number of accumulated values.

variance

public double variance()

The variance of the accumulated values.

populationStdDev

public double populationStdDev()

The population standard devation of the accumulated values.

stdDev

public double stdDev()

The sample standard devation of the accumulated values.

stdErr

public double stdErr()

The sample standard error of the accumulated values.

binomialStdErr

public double binomialStdErr()

The standard error of binomially distributed values.

z

public double z(double expected)

The Z statistic.