StorelessUnivariateStatistic

All Superinterfaces:

UnivariateStatistic

All Known Implementing Classes:

AbstractStorelessUnivariateStatistic, FirstMoment, FourthMoment, GeometricMean, Kurtosis, Max, Mean, Min, SecondMoment, Skewness, Sum, SumOfLogs, SumOfSquares, ThirdMoment, Variance
```
public interface StorelessUnivariateStatistic
extends UnivariateStatistic
```
Extends the definition of UnivariateStatistic with increment(double) and incrementAll(double[]) methods for adding values and updating internal state.
This interface is designed to be used for calculating statistics that can be computed in one pass through the data without storing the full array of sample values.

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method and Description
`void`	`clear()` Clears the internal state of the Statistic
`StorelessUnivariateStatistic`	`copy()` Returns a copy of the statistic with the same internal state.
`long`	`getN()` Returns the number of values that have been added.
`double`	`getResult()` Returns the current value of the Statistic.
`void`	`increment(double d)` Updates the internal state of the statistic to reflect the addition of the new value.
`void`	`incrementAll(double[] values)` Updates the internal state of the statistic to reflect addition of all values in the values array.
`void`	`incrementAll(double[] values, int start, int length)` Updates the internal state of the statistic to reflect addition of the values in the designated portion of the values array.

Methods inherited from interface org.apache.openejb.math.stat.descriptive.UnivariateStatistic
evaluate, evaluate

- Method Detail
  - increment
```
void increment(double d)
```
    Updates the internal state of the statistic to reflect the addition of the new value.
    
    Parameters:
    
    d - the new value.
  - incrementAll
```
void incrementAll(double[] values)
```
    Updates the internal state of the statistic to reflect addition of all values in the values array. Does not clear the statistic first -- i.e., the values are added incrementally to the dataset.
    
    Parameters:
    
    values - array holding the new values to add
    
    Throws:
    
    java.lang.IllegalArgumentException - if the array is null
  - incrementAll
```
void incrementAll(double[] values,
                  int start,
                  int length)
```
    Updates the internal state of the statistic to reflect addition of the values in the designated portion of the values array. Does not clear the statistic first -- i.e., the values are added incrementally to the dataset.
    
    Parameters:
    
    values - array holding the new values to add
    
    start - the array index of the first value to add
    
    length - the number of elements to add
    
    Throws:
    
    java.lang.IllegalArgumentException - if the array is null or the index
  - getResult
```
double getResult()
```
    Returns the current value of the Statistic.
    
    Returns:
    
    value of the statistic, Double.NaN if it has been cleared or just instantiated.
  - getN
```
long getN()
```
    Returns the number of values that have been added.
    
    Returns:
    
    the number of values.
  - clear
```
void clear()
```
    Clears the internal state of the Statistic
  - copy
```
StorelessUnivariateStatistic copy()
```
    Returns a copy of the statistic with the same internal state.
    
    Specified by:
    
    copy in interface UnivariateStatistic
    
    Returns:
    
    a copy of the statistic

Interface StorelessUnivariateStatistic

Method Summary

Methods inherited from interface org.apache.openejb.math.stat.descriptive.UnivariateStatistic

Method Detail

increment

incrementAll

incrementAll

getResult

getN

clear

copy