“Generalized entropy index”的意思、由来-开放百科全书

词条

Generalized entropy index

释义

Formula
See also
References

The generalized entropy index has been proposed as a measure of income inequality in a population.^[1] It is derived from information theory as a measure of redundancy in data. In information theory a measure of redundancy can be interpreted as non-randomness or data compression; thus this interpretation also applies to this index. In additional interpretation of the index is as biodiversity as entropy has also been proposed as a measure of diversity.^[2]

Formula

The formula for general entropy for real values of is:

where N is the number of cases (e.g., households or families), is the income for case i and is a parameter which regulates the weight given to distances between incomes at different parts of the income distribution. For large the index is especially sensitive to the existence of large incomes, whereas for small the index is especially sensitive to the existence of small incomes.

An Atkinson index index for any inequality aversion parameter can be derived from a generalized entropy index under the restriction that - i.e an Atkinson index with high inequality aversion is derived from a GE index with small . Moreover, it is the unique class of inequality measures that is a monotone transformation of the Atkinson index and which is additive decomposable. Many popular indices, including Gini index, do not satisfy additive decomposability.^[1]

The formula for deriving an Atkinson index with inequality aversion parameter epsilon (eps) under the restriction is given by:

A=[eps(eps-1)GE]^(1/(1-eps)); eps=/1

A= 1-e^-GE; eps=1

Note that the generalized entropy index has several income inequality metrics as special cases. For example, GE(0) is the mean log deviation, GE(1) is the Theil index, and GE(2) is half the squared coefficient of variation.

References

1. ^¹{{cite journal|last1=Shorrocks|first1=A. F.|title=The Class of Additively Decomposable Inequality Measures|journal=Econometrica|date=1980|volume=48|issue=3|pages=613–625|jstor=1913126|doi=10.2307/1913126}}
2. ^{{cite journal|last1=Pielou|first1=E.C.|title=The measurement of diversity in different types of biological collections|journal=Journal of Theoretical Biology|date=December 1966|volume=13|pages=131–144|doi=10.1016/0022-5193(66)90013-0|url=http://www.sciencedirect.com/science/article/pii/0022519366900130|accessdate=5 March 2015}}

2 : Income inequality metrics|Information theory

随便看

开放百科全书收录14589846条英语、德语、日语等多语种百科知识，基本涵盖了大多数领域的百科知识，是一部内容自由、开放的电子版国际百科全书。

Formula

See also

References