Package smile.data.measure

Class RatioScale

java.lang.Object

smile.data.measure.NumericalMeasure

smile.data.measure.RatioScale

All Implemented Interfaces:

Serializable, Measure

public class RatioScale
extends NumericalMeasure

The ratio scale allows for both difference and ratio of two values. Examples include mass, length, duration, plane angle, energy and electric charge. The ratio type takes its name from the fact that measurement is the estimation of the ratio between a magnitude of a continuous quantity and a unit magnitude of the same kind. A ratio scale possesses a meaningful (unique and non-arbitrary) zero value. In comparison with Celsius scale, the Kelvin temperature scale is a ratio scale because it has a unique, non-arbitrary zero point called absolute zero. Most measurement in the physical sciences and engineering is done on ratio scales.

The geometric mean and the harmonic mean are allowed to measure the central tendency of ratio variables, in addition to the mode, median, and arithmetic mean. In fact, all statistical measures are allowed because all necessary mathematical operations are defined for the ratio scale.

See Also:

• Serialized Form

Field Summary

Fields inherited from interface smile.data.measure.Measure

Currency, Percent

Constructor Summary

Constructors

Constructor	Description
RatioScale(NumberFormat format)	Constructor.

Method Summary

Modifier and Type	Method	Description
String	toString()

Methods inherited from class smile.data.measure.NumericalMeasure

toString, valueOf

Methods inherited from class java.lang.Object

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

Constructor Details

RatioScale

public RatioScale(NumberFormat format)

Constructor.

Parameters:

format - the number format.

Method Details

toString

public String toString()

Overrides:

toString in class Object