---
title: "F-measure"
description: "Also known as the \"positive specific agreement\" measure. #### Details In our field you are likely to see it as a measure of inter-rater agreement where the total number of possible objects to be rated is indeterminate, for example when…"
url: "https://www.psyctc.org/psyctc/glossary2/f-measure/"
updated: "2026-06-01"
category: All OM book glossary entries
---

# F-measure

Also known as the "positive specific agreement" measure.

#### Details

In our field you are likely to see it as a measure of inter-rater agreement where the total number of possible objects to be rated is indeterminate, for example when a text can be broken into ratable segments in many different ways and two raters won't break the text into the same segments. My [Rblog](https://www.psyctc.org/Rblog/index.html) post: [F-measure: ‘positive specific agreement’ index](https://www.psyctc.org/Rblog/posts/2025-02-17-f-measure/) shows the details (don't worry, it's a very short post!) and also shows that Cohen's kappa converges on the F-measure as the number of possible segments to rate (say) gets very large.

#### Try also

- Agreement measures
- [Inter-rater agreement/reliability](https://www.psyctc.org/psyctc/glossary2/inter-rater-agreement-reliability/)
- [Cohen's kappa](https://www.psyctc.org/psyctc/glossary2/cohens-kappa/)

#### Chapters

Not covered in the OMbook.

#### Online resources

- My [Rblog](https://www.psyctc.org/Rblog/index.html) post: [F-measure: ‘positive specific agreement’ index](https://www.psyctc.org/Rblog/posts/2025-02-17-f-measure/)
- I will try to create a shiny app to compute the F-measure

#### Dates

First created 18.ii.25.