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Quartile

Definition

A quartile is a type of quantile. The first quartile is defined as the middle number between the smallest number and the median of the data set. The second quartile is the median of the data. The third quartile is the middle value between the median and the highest value of the data set.

What is a 'Quartile'

A quartile is a statistical term describing a division of observations into four defined intervals based upon the values of the data and how they compare to the entire set of observations.

Explaining 'Quartile'

Each quartile contains 25% of the total observations. Generally, the data is ordered from smallest to largest with those observations falling below 25% of all the data analyzed allocated within the 1st quartile, observations falling between 25.1% and 50% and allocated in the 2nd quartile, then the observations falling between 51% and 75% allocated in the 3rd quartile, and finally the remaining observations allocated in the 4th quartile.

Try not to confuse a quarter with a quartile.


Further Reading


Study on dynamic factors striding across the middle income Trap-transnational empirical analysis based on quartile regression
www.tandfonline.com [PDF]
… ression R esult of the quartile reg ression b … [2] Koenker, R. and Bassett, G., 1978.Regression Quartiles. Econometrica. Vol … Empirical Research on China's Breakthrough of “Middle Income Trap” the Perspective of Economic Restructuring. Finance & Economics, 297(12), 57-64 …

The probability of publishing in first-quartile journalsThe probability of publishing in first-quartile journals
link.springer.com [PDF]
… ression R esult of the quartile reg ression b … [2] Koenker, R. and Bassett, G., 1978.Regression Quartiles. Econometrica. Vol … Empirical Research on China's Breakthrough of “Middle Income Trap” the Perspective of Economic Restructuring. Finance & Economics, 297(12), 57-64 …

The cost-effectiveness of replacing the bottom quartile of novice teachers through value-added teacher assessmentThe cost-effectiveness of replacing the bottom quartile of novice teachers through value-added teacher assessment
www.jstor.org [PDF]
… ression R esult of the quartile reg ression b … [2] Koenker, R. and Bassett, G., 1978.Regression Quartiles. Econometrica. Vol … Empirical Research on China's Breakthrough of “Middle Income Trap” the Perspective of Economic Restructuring. Finance & Economics, 297(12), 57-64 …

Quartiles in elementary statisticsQuartiles in elementary statistics
www.tandfonline.com [PDF]
… ression R esult of the quartile reg ression b … [2] Koenker, R. and Bassett, G., 1978.Regression Quartiles. Econometrica. Vol … Empirical Research on China's Breakthrough of “Middle Income Trap” the Perspective of Economic Restructuring. Finance & Economics, 297(12), 57-64 …

How ordinary consumers make complex economic decisions: Financial literacy and retirement readinessHow ordinary consumers make complex economic decisions: Financial literacy and retirement readiness
www.worldscientific.com [PDF]
… ression R esult of the quartile reg ression b … [2] Koenker, R. and Bassett, G., 1978.Regression Quartiles. Econometrica. Vol … Empirical Research on China's Breakthrough of “Middle Income Trap” the Perspective of Economic Restructuring. Finance & Economics, 297(12), 57-64 …

Slow and Steady Wins the Race: The Impact of Chasing Returns on Quartile RankingsSlow and Steady Wins the Race: The Impact of Chasing Returns on Quartile Rankings
papers.ssrn.com [PDF]
… ression R esult of the quartile reg ression b … [2] Koenker, R. and Bassett, G., 1978.Regression Quartiles. Econometrica. Vol … Empirical Research on China's Breakthrough of “Middle Income Trap” the Perspective of Economic Restructuring. Finance & Economics, 297(12), 57-64 …

Comment: How to estimate quartiles using the Blom methodComment: How to estimate quartiles using the Blom method
www.tandfonline.com [PDF]
… ression R esult of the quartile reg ression b … [2] Koenker, R. and Bassett, G., 1978.Regression Quartiles. Econometrica. Vol … Empirical Research on China's Breakthrough of “Middle Income Trap” the Perspective of Economic Restructuring. Finance & Economics, 297(12), 57-64 …

Levels of dissociation and nonsuicidal self-injury: A quartile risk modelLevels of dissociation and nonsuicidal self-injury: A quartile risk model
www.tandfonline.com [PDF]
… ression R esult of the quartile reg ression b … [2] Koenker, R. and Bassett, G., 1978.Regression Quartiles. Econometrica. Vol … Empirical Research on China's Breakthrough of “Middle Income Trap” the Perspective of Economic Restructuring. Finance & Economics, 297(12), 57-64 …

Benchmarks for expected annual academic growth for students in the bottom quartile of the normative distributionBenchmarks for expected annual academic growth for students in the bottom quartile of the normative distribution
www.tandfonline.com [PDF]
… ression R esult of the quartile reg ression b … [2] Koenker, R. and Bassett, G., 1978.Regression Quartiles. Econometrica. Vol … Empirical Research on China's Breakthrough of “Middle Income Trap” the Perspective of Economic Restructuring. Finance & Economics, 297(12), 57-64 …



Q&A About Quartile


What does each quarter contain?

Each quarter contains 25% of all the data analyzed.

What is a quartile?

A quartile is a statistical term describing a division of observations into four defined intervals based upon the values of the data and how they compare to the entire set of observations.

Why do you need to know about quartiles?

You need to know about quartiles because they are used frequently in business, science, and research.

When would you use a quarter instead of a quartile?

You would use a quarter when referring to time periods or seasons (i.e., winter, spring, summer, fall).

How are quartiles used in statistics?

Quartiles are used to divide data into 4 equal parts.

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