Simple Interactive Statistical Analysis
The Poisson help page has moved to this location.
The Poisson test is used for the analysis of rare events. It compares a count of objects or subjects (such as the number of cars or people) in a specified domain (for example a street during a certain period) with an expected number. The Poisson test can be used as an alternative to the Binomial distribution in the case of very large samples. Also, the Poisson test can be used to study how the chances of observing none, one, two or more 'accidents' or 'malfunctions' in the domain are distributed.