---
title: "✨ Get Inter-Annotator Agreement matrix"
method: GET
path: "/api/projects/{id}/stats/IAA"
tags: ["Stats"]
---

# ✨ Get Inter-Annotator Agreement matrix

`GET /api/projects/{id}/stats/IAA`

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Get Inter-Annotator Agreement (IAA) matrix for a project, showing agreement between all annotators.

## Path parameters

- `id` integer, required

## Query parameters

- `expand` string
- `per_label` boolean
- `std` boolean
- `task` string

## Response `200`

Inter-Annotator Agreement matrix

- object
  - `IAA` union — Inter-Annotator Agreement matrix - 2D array when per_label=false, object with label keys when per_label=true
    - array[] — Inter-Annotator Agreement matrix (2D array) when per_label=false
      - number[]
    - object — Inter-Annotator Agreement matrix per label when per_label=true
  - `common_tasks` union — Common tasks matrix - 2D array when per_label=false, object with label keys when per_label=true
    - array[] — Number of common tasks between annotators (2D array) when per_label=false
      - number[]
    - object — Number of common tasks per label when per_label=true
  - `std` union — Standard deviation - number when per_label=false, object with label keys when per_label=true
    - number
    - object — Standard deviation per label when per_label=true
  - `users` object[] — List of users in the matrix

---

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