---
title: Reset an Experiment
description: "Reset a Statsig experiment to return it to the unstarted state, generate a new salt, and run a fresh iteration without carrying over the previous run's results."
product: general
lang: en
token_estimate: 748
---
# Reset an Experiment

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Resetting an experiment returns it to the unstarted state so you can fix a problem and run the test again. Statsig generates a new salt, creates new group IDs, clears the start and decision state, and starts a new analysis window. Reset an experiment when a bug or a bad variant invalidated the run and you want the same test to start over.

Use a different action when you don't need a fresh run:

- To end the experiment without running it again, [abandon it](https://docs.statsig.com/experiments/ending/abandon).
- To turn off one bad variant while the rest of the experiment keeps running, [disable that group](https://docs.statsig.com/experiments/implementation/disable-group).
- To begin a new analysis window without re-randomizing anyone, [restart results](https://docs.statsig.com/experiments/interpreting-results/read-results#restarting-results). A restart keeps the existing salt, so users keep their group assignments.

## Reset an experiment

1. Open the experiment and select the **Make Decision** dropdown.
2. Select **Reset**.
3. Start the experiment again after you fix the issue that prompted the reset.

## What happens after you reset an experiment

- The experiment returns to the unstarted state. Every user receives the default experience, either the value defined in code or the layer default, until you start the experiment again.
- Statsig generates a new salt. Because the salt determines which group a user hashes into, users are randomly reassigned when you start the experiment again and don't necessarily land in the group they were in before. This reassignment keeps a bug or bad experience in the previous run from affecting the same group after you address the issue.
- Statsig creates new group IDs and preserves each group's name and size.
- Statsig clears the analysis window and saves a snapshot of the results collected so far.
- You can [archive](https://docs.statsig.com/experiments/ending/ending-experiment#archive-an-experiment) the experiment after a reset to preserve its history and make it read-only.

## Treat the new run as a separate experiment

A reset creates a new iteration rather than undoing the previous one, and Statsig can't restore an experiment to its pre-reset running state.

- Results from the earlier run stay visible in the experiment's history, but don't combine them with the new run as a single scorecard. Mixing a pre-reset period with a post-reset period introduces assignment artifacts that bias the comparison.
- Setting the salt back to its previous value doesn't resume the earlier run. It brings future assignment closer to the old hash mapping, but the analysis window has already restarted.
- A reset doesn't restore allocation on an experiment whose allocation was set to zero. Raise allocation as a separate edit after you reset.