Skip to content

Gini coefficient (Graphical)

Gini coefficient:

The Gini coefficient is used in economics to measure income inequality. Generally speaking, it is used to measure the extent of departure from a perfectly even distribution of income. A “0” indicates no departure, i.e. everyone has the same income. A “1” indicates complete departure – all income falls into an infinitely small group.

Here´s how it´s calculated. Arrange all the income groups into ascending order of income; for each group find proportion Xi of this and lower income groups into the whole population and the corresponding share Yi of income, for example, bottom 0.1 (X1) have 0.01 (Y1) of income, bottom 0.3 (X2) have 0.07 (Y2) of income, etc; then

Math image

where Math image (assuming X0 = 0). Gini coefficient can be calculated for any number of groups, and the groups may be of different sizes, e.g 4 groups with proportions in the whole population 0.1, 0.3, 0.4, 0.2.

Browse Other Glossary Entries

Test Yourself

Planning on taking an introductory statistics course, but not sure if you need to start at the beginning? Review the course description for each of our introductory statistics courses and estimate which best matches your level, then take the self test for that course. If you get all or almost all the questions correct, move on and take the next test.

Data Analytics

Considering becoming adata scientist, customer analyst or our data science certificate program?

Analytics Quiz

Advanced Statistics Quiz

Statistics Quiz


Looking at statistics for graduate programs or to enhance your foundational knowledge?

Statistics 1 Quiz

Regression Quiz

Regression Quiz


Entering the biostatistics field? Test your skill here.

Biostatistics Quiz

Advanced Statistics Quiz

Statistics 2 Quiz

Stay Informed

Our Blog

Read up on our latest blogs


Learn about our certificate programs


Find the right course for you

Contact Us

We'd love to answer your questions

Our mentors and academic advisors are standing by to help guide you towards the courses or program that makes the most sense for you and your goals.

300 W Main St STE 301, Charlottesville, VA 22903

(434) 973-7673

By submitting your information, you agree to receive email communications from All information submitted is subject to our privacy policy. You may opt out of receiving communications at any time.