weka.core.stats

Class QuantileCalculator

java.lang.Object

weka.core.stats.QuantileCalculator

All Implemented Interfaces:

java.io.Serializable

public class QuantileCalculator
extends java.lang.Object
implements java.io.Serializable

Class for maintaining quantile estimators for all the numeric attributes in a dataset.

Version:

$Revision: 10930 $

Author:

Mark Hall (mhall{[at]}pentaho{[dot]}com)

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
QuantileCalculator(weka.core.Instances header, double[] quantiles) Constructor

Method Summary

Modifier and Type	Method and Description
double	getQuantile(java.lang.String attName, double quantileToGet) Get a specific quantile for the named attribute
double[]	getQuantiles(java.lang.String attName) Get the computed quantiles for the named attribute
void	setHistogramMap(java.util.Map<java.lang.Integer,NumericAttributeBinData> initializedHistData) Set a map of initialized numeric histogram data to be updated for each incoming row/instance
void	update(weka.core.Instance inst) Perform an update using the supplied instance
void	update(java.lang.String[] row, java.lang.String missingValue) Perform an update using an instance represented as an array of string values

Methods inherited from class java.lang.Object

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

Constructor Detail

QuantileCalculator

public QuantileCalculator(weka.core.Instances header,
                          double[] quantiles)

Constructor

Parameters:

header - the header of the dataset to process

quantiles - an array of quantiles to compute for each numeric attribute

Method Detail

setHistogramMap

public void setHistogramMap(java.util.Map<java.lang.Integer,NumericAttributeBinData> initializedHistData)

Set a map of initialized numeric histogram data to be updated for each incoming row/instance

Parameters:

initializedHistData - a map of NumericAttributeBinData that has been initialized. Keyed by attribute index

update

public void update(java.lang.String[] row,
                   java.lang.String missingValue)
            throws java.lang.Exception

Perform an update using an instance represented as an array of string values

Parameters:

row - the row to update with

missingValue - the missing value string

Throws:

java.lang.Exception - if a problem occurs

update

public void update(weka.core.Instance inst)
            throws java.lang.Exception

Perform an update using the supplied instance

Parameters:

inst - the instance to update with

Throws:

java.lang.Exception - if a problem occurs

getQuantiles

public double[] getQuantiles(java.lang.String attName)
                      throws java.lang.Exception

Get the computed quantiles for the named attribute

Parameters:

attName - the attribute to get the current computed quantiles for

Returns:

the current values of the quantiles

Throws:

java.lang.Exception - if a problem occurs

getQuantile

public double getQuantile(java.lang.String attName,
                          double quantileToGet)
                   throws java.lang.Exception

Get a specific quantile for the named attribute

Parameters:

attName - the name of the attribute to get a quantile for

quantileToGet - the specific quantile to get

Returns:

the current value of the quantile

Throws:

java.lang.Exception - if a problem occurs