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Java Source Code / Java Documentation » Science » Apache commons math 1.1 » org.apache.commons.math.stat.descriptive.moment 
Source Cross Reference  Class Diagram Java Document (Java Doc) 


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

All known Subclasses:   org.apache.commons.math.stat.descriptive.moment.SecondMoment,
FirstMoment
public class FirstMoment extends AbstractStorelessUnivariateStatistic implements Serializable(Code)
Computes the first moment (arithmetic mean). Uses the definitional formula:

mean = sum(x_i) / n

where n is the number of observations.

To limit numeric errors, the value of the statistic is computed using the following recursive updating algorithm:

  1. Initialize m = the first value
  2. For each additional value, update using
    m = m + (new value - m) / (number of observations)

Returns Double.NaN if the dataset is empty.

Note that this implementation is not synchronized. If multiple threads access an instance of this class concurrently, and at least one of the threads invokes the increment() or clear() method, it must be synchronized externally.
version:
   $Revision: 348519 $ $Date: 2005-11-23 12:12:18 -0700 (Wed, 23 Nov 2005) $



Field Summary
protected  doubledev
     Deviation of most recently added value from previous first moment.
protected  doublem1
    
protected  longn
    
protected  doublenDev
     Deviation of most recently added value from previous first moment, normalized by previous sample size.

Constructor Summary
public  FirstMoment()
    

Method Summary
public  voidclear()
    
public  longgetN()
    
public  doublegetResult()
    
public  voidincrement(double d)
    

Field Detail
dev
protected double dev(Code)
Deviation of most recently added value from previous first moment. Retained to prevent repeated computation in higher order moments.



m1
protected double m1(Code)
First moment of values that have been added



n
protected long n(Code)
Count of values that have been added



nDev
protected double nDev(Code)
Deviation of most recently added value from previous first moment, normalized by previous sample size. Retained to prevent repeated computation in higher order moments




Constructor Detail
FirstMoment
public FirstMoment()(Code)
Create a FirstMoment instance




Method Detail
clear
public void clear()(Code)

See Also:   org.apache.commons.math.stat.descriptive.StorelessUnivariateStatistic.clear



getN
public long getN()(Code)

See Also:   org.apache.commons.math.stat.descriptive.StorelessUnivariateStatistic.getN



getResult
public double getResult()(Code)

See Also:   org.apache.commons.math.stat.descriptive.StorelessUnivariateStatistic.getResult



increment
public void increment(double d)(Code)

See Also:   org.apache.commons.math.stat.descriptive.StorelessUnivariateStatistic.increment(double)



Methods inherited from org.apache.commons.math.stat.descriptive.AbstractStorelessUnivariateStatistic
abstract public void clear()(Code)(Java Doc)
public boolean equals(Object object)(Code)(Java Doc)
public double evaluate(double[] values)(Code)(Java Doc)
public double evaluate(double[] values, int begin, int length)(Code)(Java Doc)
abstract public double getResult()(Code)(Java Doc)
public int hashCode()(Code)(Java Doc)
abstract public void increment(double d)(Code)(Java Doc)
public void incrementAll(double[] values)(Code)(Java Doc)
public void incrementAll(double[] values, int begin, int length)(Code)(Java Doc)

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