The entropy index (also called information index) measures departure from evenness by assessing each spatial unit deviation from the entropy in the area.
- an object of class matrix (or which can be coerced to that class), where each column represents the distribution of a group within spatial units. The number of columns should be greater than 1 (at least 2 groups are required). You should not include a column with total population, because this will be interpreted as a group.
a numeric vector containing Theils's entropy index value for each group
Theil H. (1972) Statistical decomposition analysis: with applications in the social and administrative. Amsterdam, North-Holland, 337 p.
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