---
title: Fleiss' Kappa Agreement
description: What is Fleiss' Kappa? Fleiss' Kappa is a statistical measure of agreement between at least 3 observers. It is used to assess the interobserver…
---
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# Fleiss' Kappa Agreement
# What is Fleiss' Kappa?
Fleiss' Kappa is a statistical measure of agreement between at least 3 observers.
It is used to assess the interobserver reliability of several observers.
The observed variable must be categorial: either a Yes-no (binary) or List.
# How to calculate Fleiss' Kappa?
1. Go to "Test variables"
2. Pick a first List or Yes-no variable
3. Pick a second List or Yes-no variable
4. Pick a third List or Yes-no variable
5. Click on the panel titled "Find an agreement"
Fleiss' kappa will be calculated and the interpretation according to Landis and Koch will be prompted.
# Why is Fleiss' Kappa not available?
If you are not prompted with a "Fleiss' kappa" panel, please ensure that:
- All the chosen variables have the same type: Yes-no or List. You can not mix Yes-no and List variables
- If you use List variables, they have the same modalities (values). For example, if you have 3 observers named "Observer 1", "Observer 2" and "Observer 3" which assess the eye colors of participants, the possible values for each observer must be identical: "blue", "green", "brown", ...
- You have at least 3 variables selected. If there are only 2 observers, a [Cohen's kappa](https://help.easymedstat.com/support/solutions/articles/77000401564-the-cohen-s-kappa-agreement?hsLang=en) is calculated instead.
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