Package org.hipparchus.stat.descriptive.rank

Class Median

java.lang.Object

org.hipparchus.stat.descriptive.AbstractUnivariateStatistic

org.hipparchus.stat.descriptive.rank.Median

All Implemented Interfaces:

Serializable, UnivariateStatistic, MathArrays.Function

public class Median
extends AbstractUnivariateStatistic
implements Serializable

Returns the median of the available values. This is the same as the 50th percentile. See Percentile for a description of the algorithm used.

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.

See Also:

• Serialized Form

Constructor Summary

Constructors

Constructor	Description
Median()	Default constructor.

Method Summary

Modifier and Type	Method	Description
Median	copy()	Returns a copy of the statistic with the same internal state.
double	evaluate(double[] values, int begin, int length)	Returns the result of evaluating the statistic over the specified entries in the input array.
Percentile.EstimationType	getEstimationType()	Get the estimation type used for computation.
KthSelector	getKthSelector()	Get the kthSelector used for computation.
NaNStrategy	getNaNStrategy()	Get the NaN Handling strategy used for computation.
Median	withEstimationType(Percentile.EstimationType newEstimationType)	Build a new instance similar to the current one except for the estimation type.
Median	withKthSelector(KthSelector newKthSelector)	Build a new instance similar to the current one except for the kthSelector instance specifically set.
Median	withNaNStrategy(NaNStrategy newNaNStrategy)	Build a new instance similar to the current one except for the NaN handling strategy.

Methods inherited from class org.hipparchus.stat.descriptive.AbstractUnivariateStatistic

evaluate, getData, getDataRef, setData, setData

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.hipparchus.stat.descriptive.UnivariateStatistic

evaluate

Constructor Details

Median

public Median()

Default constructor.

Method Details

evaluate

public double evaluate(double[] values,
 int begin,
 int length)
                throws MathIllegalArgumentException

Returns the result of evaluating the statistic over the specified entries in the input array.

Specified by:

evaluate in interface MathArrays.Function

Specified by:

evaluate in interface UnivariateStatistic

Specified by:

evaluate in class AbstractUnivariateStatistic

Parameters:

values - the input array

begin - the index of the first element to include

length - the number of elements to include

Returns:

the value of the statistic applied to the included array entries

Throws:

MathIllegalArgumentException - if values is null or the indices are invalid

copy

public Median copy()

Returns a copy of the statistic with the same internal state.

Specified by:

copy in interface UnivariateStatistic

Specified by:

copy in class AbstractUnivariateStatistic

Returns:

a copy of the statistic

getEstimationType

public Percentile.EstimationType getEstimationType()

Get the estimation type used for computation.

Returns:

the estimationType set

withEstimationType

public Median withEstimationType(Percentile.EstimationType newEstimationType)

Build a new instance similar to the current one except for the estimation type.

Parameters:

newEstimationType - estimation type for the new instance

Returns:

a new instance, with changed estimation type

Throws:

NullArgumentException - when newEstimationType is null

getNaNStrategy

public NaNStrategy getNaNStrategy()

Get the NaN Handling strategy used for computation.

Returns:

NaN Handling strategy set during construction

withNaNStrategy

public Median withNaNStrategy(NaNStrategy newNaNStrategy)

Build a new instance similar to the current one except for the NaN handling strategy.

Parameters:

newNaNStrategy - NaN strategy for the new instance

Returns:

a new instance, with changed NaN handling strategy

Throws:

NullArgumentException - when newNaNStrategy is null

getKthSelector

public KthSelector getKthSelector()

Get the kthSelector used for computation.

Returns:

the kthSelector set

withKthSelector

public Median withKthSelector(KthSelector newKthSelector)

Build a new instance similar to the current one except for the kthSelector instance specifically set.

Parameters:

newKthSelector - KthSelector for the new instance

Returns:

a new instance, with changed KthSelector

Throws:

NullArgumentException - when newKthSelector is null