OasisR (version 2.0.1)

HTheil: A function to compute Theil's entropy segregation index

Description

The entropy index (also called information index) measures departure from evenness by assessing each spatial unit deviation from the entropy in the area.

Usage

HTheil (x)

Arguments

x

- an object of class matrix (or which can be coerced to that class), where each column represents the distribution of a population group, within spatial units. The number of columns should be greater than 1 (at least 2 population groups are required). You should not include a column with total population in each unit, because this will be interpreted as a group.

Value

a numeric vector containing Theils's entropy index value for each population group

References

Theil H. (1972) Statistical decomposition analysis: with applications in the social and administrative. Amsterdam, North-Holland, 337 p.

See Also

One-group evenness indices: ISDuncan, Gini, Gorard, Atkinson, 'ISWong, ISMorrill

Between groups dissimilarity indices: DIDuncan, Gini2, DIMorrill, DIWong

Examples

# NOT RUN {
x <- segdata@data[ ,1:2]
HTheil(x) 
# }