---
title: Octile(s)
description: "I confess this is me throwing one in for completeness, I don't think I've ever seen it used in any report or paper I've ever read. #### Details The quantiles that divide a distribution into eight equal sized value ranges…"
url: "https://www.psyctc.org/psyctc/glossary2/octiles/"
updated: "2026-06-01"
category: All OM book glossary entries
---

# Octile(s)

I confess this is me throwing one in for completeness, I don't think I've ever seen it used in any report or paper I've ever read.

#### Details

The quantiles that divide a distribution into eight equal sized value ranges so in percentile terminology:

- 0% to <12.5%
- 12.5% to <25%
- 25% to <37.5%
- 37.5% to <50%
- 50% to <67.5%
- 67.5% to <75%
- 75% to 100%

[Slightly dodgy use of the "<" to purists but I think what I mean is clear!]

#### Try also

- [Five number summary](https://www.psyctc.org/psyctc/glossary2/five-number-summary/)
- [Distribution](https://www.psyctc.org/psyctc/glossary2/distribution/)
- [Seven number summaries](https://www.psyctc.org/psyctc/glossary2/seven-point-summaries/)
- [Percentiles](https://www.psyctc.org/psyctc/glossary2/percentiles/)
- [Quantiles](https://www.psyctc.org/psyctc/glossary2/quantiles/)
- [Quartiles](https://www.psyctc.org/psyctc/glossary2/quartiles/)

#### Chapters

Not covered in the OMbook.

#### Online resources

- One of my [shiny apps](https://shiny.psyctc.org): [ECDF plot with quantiles and CIs for quantiles](https://shiny.psyctc.org/apps/ECDFplot/) is pertinent in the unlikely event that you ever want to get the octiles for your data with their confidence intervals!

#### Dates

First created 9.iv.25, links expanded 10.iv.25.