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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.Mean

Mean
public class Mean extends AbstractStorelessUnivariateStatistic implements Serializable(Code)
Returns the arithmetic mean of the available values. Uses the definitional formula:

mean = sum(x_i) / n

where n is the number of observations.

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  booleanincMoment
     Determines whether or not this statistic can be incremented or cleared.
protected  FirstMomentmoment
     First moment on which this statistic is based.

Constructor Summary
public  Mean()
     Constructs a Mean.
public  Mean(FirstMoment m1)
     Constructs a Mean with an External Moment.

Method Summary
public  voidclear()
    
public  doubleevaluate(double[] values, int begin, int length)
     Returns the arithmetic mean of the entries in the specified portion of the input array, or Double.NaN if the designated subarray is empty.
public  longgetN()
    
public  doublegetResult()
    
public  voidincrement(double d)
    

Field Detail
incMoment
protected boolean incMoment(Code)
Determines whether or not this statistic can be incremented or cleared.

Statistics based on (constructed from) external moments cannot be incremented or cleared.




moment
protected FirstMoment moment(Code)
First moment on which this statistic is based.




Constructor Detail
Mean
public Mean()(Code)
Constructs a Mean.



Mean
public Mean(FirstMoment m1)(Code)
Constructs a Mean with an External Moment.
Parameters:
  m1 - the moment




Method Detail
clear
public void clear()(Code)

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



evaluate
public double evaluate(double[] values, int begin, int length)(Code)
Returns the arithmetic mean of the entries in the specified portion of the input array, or Double.NaN if the designated subarray is empty.

Throws IllegalArgumentException if the array is null.

See Mean for details on the computing algorithm.
Parameters:
  values - the input array
Parameters:
  begin - index of the first array element to include
Parameters:
  length - the number of elements to include the mean of the values or Double.NaN if length = 0
throws:
  IllegalArgumentException - if the array is null or the array indexparameters are not valid




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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