org.apache.spark.mllib.tree.impurity

Class Variance

Object

org.apache.spark.mllib.tree.impurity.Variance

All Implemented Interfaces:

java.io.Serializable, Impurity

public class Variance
extends Object
implements Impurity

:: Experimental :: Class for calculating variance during regression

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
Variance()

Method Summary

Methods

Modifier and Type	Method and Description
static double	calculate(double c0, double c1)
static double	calculate(double count, double sum, double sumSquares) :: DeveloperApi :: variance calculation

Methods inherited from class Object

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

Methods inherited from interface org.apache.spark.mllib.tree.impurity.Impurity

calculate, calculate

Constructor Detail

Variance

public Variance()

Method Detail

calculate

public static double calculate(double c0,
               double c1)

calculate

public static double calculate(double count,
               double sum,
               double sumSquares)

:: DeveloperApi :: variance calculation

Parameters:

count - number of instances

sum - sum of labels

sumSquares - summation of squares of the labels