[R] Function Gini or Ineq

[Karen Kotschy]

Hi Marcio

You might like to look at some equivalents from the field of ecology, for 
which there are existing functions. Have a look at the function 
"diversity" in the package "vegan". This provides the Simpson diversity 
index, which is the complement of the Gini coefficient (Gini = 1 - 
Simpson). See attached paper by Stirling (2007).

I'm not sure what you want to do with your weightings, but you could have 
a look at Rao's quadratic entropy index: this is a weighted diversity 
index (in ecology usually weighted by the abundance of the species, which 
are the objects for which diversity is measured). You can get this from 
the function "divc" in the package "ade4". There are also some other 
weighted diversity indices in the package "FD" (functional diversity).

HTH
Karen


On Fri 03Sep10, Mestat wrote:
> 
> Hi listers,
> Does it necessary to install any package in order to use the GINI or INEQ
> functions.
> If I use the following command the R tells me that didn't find the GINI
> function.
> 
> x<-c(541, 1463, 2445, 3438, 4437, 5401, 6392, 8304, 11904, 22261)
> G<-gini(x)
> 
> Thanks in advance,
> Marcio
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