---
title: "Calibration"
description: "precision, recall and the undercount, by segment, with intervals"
section: concepts
address: /concepts/calibration
contract: 0476e35e6e275db5
---

# Calibration

precision, recall and the undercount, by segment, with intervals

[figure: Calibration is a value at none scope. The drawing shows its fields and the objects that they point at.]

| property | value |
|---|---|
| kind | value |
| scope | none |
| key | none |
| store | none |
| family | rules_engine |



## Fields


| field | type | required | note |
|---|---|---|---|
| `precision` | `share` | yes |  |
| `recall` | `share` | yes |  |
| `undercount` | `share` | yes | one minus recall |
| `interval` | [Interval](/concepts/interval) | yes |  |
| `by_segment` | `{text:share}` | yes |  |
| `labelled_set` | `id` | yes |  |
| `read_at` | `time` | yes |  |
| `subjects` | `count` | yes |  |



## Routes that use it
No route takes or returns Calibration directly. The record holds it, and the objects that point at it reach it.