Poisson Test Calculator

Test if an observed event count differs from an expected rate

Observed Count:

Expected Rate (per unit time):

Time Period (or exposure):

Test Type:

The Poisson test is used to test if an observed count differs from an expected rate.

It's appropriate for rare events occurring in a fixed time or space interval.

Expected count = rate × time period

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Formula Source: Standard Mathematical References

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ðŸ”„Last reviewed: May 2026

âœ“Formula checks are based on standard references and internal QA review.