StatCalc: Statistical Calculators

StatCalc
  1. Introduction
  2. Tables (2 x 2, 2 x n)
  3. Stratified Analysis of 2 x 2 Tables
  4. Population Survey or Descriptive Study
  5. Cohort and Cross-Sectional
  6. Unmatched Case-Control
  7. Chi Square for Trend
  8. Poisson
  9. Binomial
  10. Matched Pair Case-Control
  11. Visual Dashboard
  12. OpenEpi.com
Related Pages

Poisson

To analyze the Poisson distribution, enter the expected number of positive outcomes in Expected # of events and the value of positive outcomes you would like to determine the probability of in Observed # of events.

StatCalc showing a Poisson rare event versus standard distribution.

Figure 10.14: Poisson Distribution

The results show that there is a 0.13% chance of having six or more positive outcomes when the expected value is 1.16. Additional percentages are stated for the ranges outlined in the left column of the table.

Page last reviewed: September 16, 2022, 12:00 pm
Content source: Epi Info™, Division of Health Informatics & Surveillance (DHIS), Center for Surveillance, Epidemiology & Laboratory Services (CSELS)