---
title: "What is Alpha Spending?"
url: https://fibr.ai/glossary/alpha-spending
description: "Alpha spending controls type I error when checking results at multiple points in an experiment by “spending” the allowed error across those checks"
last_updated: 2026-05-05T11:55:54.335964+00:00
---
Alpha spending is a statistical method that distributes significance thresholds across interim checks in experiments. It prevents inflated false positives when results are evaluated multiple times before a test concludes.

This approach is common in medical trials but is also applied in digital optimization to preserve the validity of A/B test outcomes. By controlling how much significance is “spent” at each checkpoint, teams maintain reliable conclusions while still monitoring progress.

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