Sample Ratio Mismatch

Sample Ratio Mismatch happens when the actual traffic split in your test does not match what you planned. For example, you planned 50 and 50 but the data shows 57 and 43. This is often a sign of a setup problem, such as tracking issues or broken random assignment. When you see it, pause and investigate before trusting any results.

Example: You notice strange signals shortly after launching an A/B test, and discover a missing tag on one version. You fix it, then restart the test so the split is correct.

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