# Gini

### Related Doc: package impurity

#### object Gini extends Impurity

Class for calculating the Gini impurity (http://en.wikipedia.org/wiki/Decision_tree_learning#Gini_impurity) during multiclass classification.

Annotations
@Since( "1.0.0" )
Source
Gini.scala
Linear Supertypes
Impurity, Serializable, Serializable, AnyRef, Any
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### Value Members

1. #### final def !=(arg0: Any): Boolean

Definition Classes
AnyRef → Any
2. #### final def ##(): Int

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3. #### final def ==(arg0: Any): Boolean

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4. #### final def asInstanceOf[T0]: T0

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5. #### def calculate(count: Double, sum: Double, sumSquares: Double): Double

:: DeveloperApi :: variance calculation

:: DeveloperApi :: variance calculation

count

number of instances

sum

sum of labels

sumSquares

summation of squares of the labels

returns

information value, or 0 if count = 0

Definition Classes
GiniImpurity
Annotations
@Since( "1.0.0" ) @DeveloperApi()
6. #### def calculate(counts: Array[Double], totalCount: Double): Double

:: DeveloperApi :: information calculation for multiclass classification

:: DeveloperApi :: information calculation for multiclass classification

counts

Array[Double] with counts for each label

totalCount

sum of counts for all labels

returns

information value, or 0 if totalCount = 0

Definition Classes
GiniImpurity
Annotations
@Since( "1.1.0" ) @DeveloperApi()
7. #### def clone(): AnyRef

Attributes
protected[java.lang]
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AnyRef
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@throws( ... )
8. #### final def eq(arg0: AnyRef): Boolean

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AnyRef
9. #### def equals(arg0: Any): Boolean

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10. #### def finalize(): Unit

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protected[java.lang]
Definition Classes
AnyRef
Annotations
@throws( classOf[java.lang.Throwable] )
11. #### final def getClass(): Class[_]

Definition Classes
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12. #### def hashCode(): Int

Definition Classes
AnyRef → Any
13. #### def instance: Gini.this.type

Get this impurity instance.

Get this impurity instance. This is useful for passing impurity parameters to a Strategy in Java.

Annotations
@Since( "1.1.0" )
14. #### final def isInstanceOf[T0]: Boolean

Definition Classes
Any
15. #### final def ne(arg0: AnyRef): Boolean

Definition Classes
AnyRef
16. #### final def notify(): Unit

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AnyRef
17. #### final def notifyAll(): Unit

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18. #### final def synchronized[T0](arg0: ⇒ T0): T0

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19. #### def toString(): String

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20. #### final def wait(): Unit

Definition Classes
AnyRef
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@throws( ... )
21. #### final def wait(arg0: Long, arg1: Int): Unit

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@throws( ... )
22. #### final def wait(arg0: Long): Unit

Definition Classes
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@throws( ... )