smile.data.measure

Class NominalScale

java.lang.Object

smile.data.measure.CategoricalMeasure

smile.data.measure.NominalScale

All Implemented Interfaces:

java.io.Serializable, Measure

public class NominalScale
extends CategoricalMeasure

Nominal variables take on a limited number of unordered values. Such variables are often referred to as categorical variables. Examples include gender, nationality, ethnicity, language, genre, style, biological species, etc.

The nominal type differentiates between items or subjects based only on their names or (meta-)categories and other qualitative classifications they belong to. Numbers may be used to represent the variables but the numbers have no specific numerical value or meaning. No form of arithmetic computation (+, −, ×, etc.) may be performed on nominal measures.

See Also:

Serialized Form

Field Summary

Fields inherited from interface smile.data.measure.Measure

Currency, Percent

Constructor Summary

Constructors

Constructor and Description
NominalScale(java.lang.Class<? extends java.lang.Enum> clazz) Constructor.
NominalScale(int[] values, java.lang.String[] levels) Constructor.
NominalScale(java.util.List<java.lang.String> levels) Constructor.
NominalScale(java.lang.String... levels) Constructor.

Method Summary

Modifier and Type	Method and Description
boolean	equals(java.lang.Object o)
java.lang.String	toString()

Methods inherited from class smile.data.measure.CategoricalMeasure

factor, level, levels, size, toString, toString, type, valueOf, values

Methods inherited from class java.lang.Object

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

Constructor Detail

NominalScale

public NominalScale(java.lang.String... levels)

Constructor.

Parameters:

levels - the levels of nominal values.

NominalScale

public NominalScale(int[] values,
                    java.lang.String[] levels)

Constructor.

Parameters:

values - the valid values.

levels - the levels of discrete values.

NominalScale

public NominalScale(java.util.List<java.lang.String> levels)

Constructor.

Parameters:

levels - the levels of discrete values.

NominalScale

public NominalScale(java.lang.Class<? extends java.lang.Enum> clazz)

Constructor.

Parameters:

clazz - an Enum class.

Method Detail

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object

equals

public boolean equals(java.lang.Object o)

Overrides:

equals in class CategoricalMeasure