Sample Size for One-Sample Poisson Test

Calculate the exposure or sample size you need to test a Poisson rate against a reference rate. Provide the baseline rate, expected rate, overdispersion, and choose between normal and exact methods to balance alpha and power.

Best suited for

• Event or incident rates compared to a target benchmark
• Reliability or safety studies using time-at-risk
• Situations where overdispersion needs to be considered

Inputs to configure

• Reference rate (lambda0) and expected rate (lambda1)
• Alpha, power, and sidedness
• Overdispersion factor and exposure per subject