---
title: "SampleStratum"
description: "one stratum of a preview's sample: how many matched in it and how many are shown"
section: concepts
address: /concepts/samplestratum
contract: 0476e35e6e275db5
---

# SampleStratum

one stratum of a preview's sample: how many matched in it and how many are shown

[figure: SampleStratum 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 |
|---|---|---|---|
| `stratum` | `text` | yes |  |
| `matched` | `count` | yes |  |
| `shown` | `count` | yes |  |



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