---
title: "Tukey’s seven-number summary"
description: "One of three different [\"seven number\" summaries](https://www.psyctc.org/psyctc/glossary2/seven-point-summaries/) of the distribution of a set of scores. These are all extensions of the five point summary (minimum, lower quartile, median, upper quartile and maximum). #### Details Unlike \"the\" seven-number summary and Bowley's…"
url: "https://www.psyctc.org/psyctc/glossary2/tukeys-seven-number-summary/"
updated: "2026-06-01"
category: All OM book glossary entries
---

# Tukey’s seven-number summary

One of three different ["seven number" summaries](https://www.psyctc.org/psyctc/glossary2/seven-point-summaries/) of the distribution of a set of scores. These are all extensions of the five point summary (minimum, lower quartile, median, upper quartile and maximum).

#### Details

Unlike "the" seven-number summary and Bowley's seven number summary the summary numbers for Tukey's version are the minimum, the first octile (i.e. the 12.5% percentile), the five-number points of the lower quartile, median and upper quartile and upper octile (87.5% percentile) and the maximum.

The differences from Bowley's seven numbers are in using the first and last octiles rather than the first and last deciles.

I honestly doubt if you'll ever see these used unless I squeeze them into a paper just for the fun of it. (Tempting but I won't!)

#### Try also

- [Bowley’s seven-figure summary](https://www.psyctc.org/psyctc/glossary2/five-number-summary/)
- [Five point summary](https://www.psyctc.org/psyctc/glossary2/five-number-summary/)
- [Percentiles](https://www.psyctc.org/psyctc/glossary2/percentiles/)
- [Quantiles](https://www.psyctc.org/psyctc/glossary2/quantiles/)
- [Quartiles](https://www.psyctc.org/psyctc/glossary2/quartiles/)
- [Seven point summaries](https://www.psyctc.org/psyctc/glossary2/seven-point-summaries/)
- ["The" seven number summary](https://www.psyctc.org/psyctc/glossary2/the-seven-number-summary/)

#### 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 any of these seven point splits of your data with their confidence intervals!

#### Dates

First created 3.v.25, links tweaked 4.v.25.