Definition, Meaning & Synonyms

decile

noun

/ˈdɛsaɪl/

Definition

Each of the groups into which data can be divided, based on the distribution of values, where there are ten equal parts.

Examples

The first decile in the income distribution indicates households earning less than 10% of the total income.
Researchers often analyze test scores by deciles to better understand student performance.

Meaning

A decile is a statistical term used to describe the division of a sorted dataset into ten equal parts. Each part contains 10% of the total data points, with the first decile (D1) containing the lowest 10% and the tenth decile (D10) containing the highest 10%.