Gini coefficient, concentration measurement: an implementation in R

December 17, 2014
By

(This article was first published on The Beginner Programmer, and kindly contributed to R-bloggers)

Another subject we took in the statistics class was the Gini index.

Gini index or ratio or coefficient is used to calculate how much a certain transferable phenomenon such as income or stocks for instance, is concentrated.

For example, say you are evaluating a company and you’d like to know more about how the shares are divided among the shareholders. You could use Gini index for that!

I’ve calculated the index using R and random data you can download here. In case you’d like to know more about Gini index check here.

Rplot

Here my simple R implementation of the index.

Here below are the results

im2

im1

It looks like the data I used shows a 24% concentration. Cool!

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