smile.data.measure

Class OrdinalScale

java.lang.Object

smile.data.measure.CategoricalMeasure

smile.data.measure.OrdinalScale

All Implemented Interfaces:

java.io.Serializable, Measure

public class OrdinalScale
extends CategoricalMeasure

The ordinal type allows for rank order (1st, 2nd, 3rd, etc.) by which data can be sorted, but still does not allow for relative degree of difference between them. The psychological measurement, such as measurement of opinions, usually operates on ordinal scales. For example, 'completely agree', 'mostly agree', 'mostly disagree', 'completely disagree' when measuring opinion.

The median, i.e. middle-ranked, item is allowed as the measure of central tendency. But means and standard deviations have no validity. In particular, IQ scores reflect an ordinal scale, in which all scores are meaningful for comparison only. There is no absolute zero, and a 10-point difference may carry different meanings at different points of the scale.

See Also:

Serialized Form

Field Summary

Fields inherited from interface smile.data.measure.Measure

Currency, Percent

Constructor Summary

Constructors

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

OrdinalScale

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

Constructor.

Parameters:

levels - the levels of ordinal values.

OrdinalScale

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

Constructor.

Parameters:

values - the valid values.

levels - the levels of discrete values.

OrdinalScale

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

Constructor.

Parameters:

levels - the levels of discrete values.

OrdinalScale

public OrdinalScale(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