DEFINITION of 'Quintiles'
A statistical value of a data set that represents 20% of a given population. The first quartile represents the lowest fifth of the data (120%); the second quartile represents the second fifth (21%  40%) etc.
INVESTOPEDIA EXPLAINS 'Quintiles'
Quintiles are often used to create cutoff points for a given population. For example, a government sponsored socioeconomic study may use quintiles to determine the maximum wealth a family could possess in order to belong to the lowest quintile of society. This cutoff point can then be used as a prerequisite for a family to receive a special government subsidy aimed to help society's less fortunate.
RELATED TERMS

Variance
The spread between numbers in a data set, measuring Variance ... 
Mean
The simple mathematical average of a set of two or more numbers. ... 
Quartile
A statistical term describing a division of observations into ... 
Standard Deviation
1. A measure of the dispersion of a set of data from its mean. ... 
Statistics
A type of mathematical analysis involving the use of quantified ... 
Sampling
A process used in statistical analysis in which a predetermined ...
Related Articles

Economics
Why The Consumer Price Index Is Controversial
Find out why economists are torn about how to calculate inflation. 
Personal Finance
What is the average salary for an accountant?
Learn about the average salaries of various accounting positions, and see the difference that an accounting degree makes in attaining higher wages. 
Fundamental Analysis
Lognormal and Normal Distribution
When and why do you use lognormal distribution or normal distribution for analyzing securities? Lognormal for stocks, normal for portfolio returns. 
Economics
Where is cost of living lowest in the world?
Learn how the cost of living is the lowest in India based on numbers derived from the CPI and organizations like Expatistan and Numbeo. 
Economics
Is the Bureau of Labor Statistics accurate?
Read this brief analysis of the accuracy of Bureau of Labor Statistics, including a summary of the types of reports issued and how they are compiled. 
Investing Basics
Using Normal Distribution Formula To Optimize Your Portfolio
Normal or bell curve distribution can be used in portfolio theory to help portfolio managers maximize return and minimize risk. 
Economics
How does the Bureau of Labor Statistics define contingent workers?
Discover how contingent workers are a significant part of the labor force and are defined as persons who do not expect their jobs to last. 
Economics
How does the Bureau of Labor Statistics determine the Consumer Price Index (CPI)?
Changes in the average price level of more than 200 goods and services across the U.S. economy are used to determine the Consumer Price Index, or CPI. 
Economics
How is the cost of living index calculated?
Discover how calculations for cost of living indexes are made based on the average prices of common goods and services between different regions. 
Economics
How does the Bureau of Labor Statistics determine the unemployment rate?
Learn how estimates of the unemployment rate are made based on monthly surveys of American households that are conducted by the U.S. Census Bureau.