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One-Sample Tests (aka Fixed-Value Test)

A one-sample test compares a single sample of data against a known or hypothesized value to determine if there is a statistically significant difference. Unlike A/B tests that compare two groups, one-sample tests evaluate whether a single group differs from a specific benchmark, target, or historical baseline.

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When to Use One-Sample Tests

One-sample tests are useful for comparing a single group against a known value:
  • Single Group Events: When only one group can trigger certain events (e.g., feature usage, error types), compare against expected baseline
  • Algorithm Testing: Test if an algorithm performs better than random (e.g., testing if success rate differs from 50%)

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Statistical Considerations

One-sample tests provide a way to make statistical inferences about whether your observed data differs significantly from a hypothesized value. The test helps determine if any observed difference is due to random variation or represents a true change in the underlying process.

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How to Enable the Feature

  1. Go to the setup page of an experiment
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  1. Click the metric name
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  1. Select Use Fixed Baseline as Control
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