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Table of Contents Univariate Data Distributions Most common distributons Poisson Distribution  
See also: binomial distribution, relationship between distributions 
Definition 
Similar to binomial distribution, but used if the probability that the observed event occurs is very small, in contrast to the population, that is a very large number. 
Graphical View 

Applications  The Poisson distribution is the distribution of rare events. A typical application is the probability that a certain number of accidents will occur in a given interval, or the probability of radioactive decay. The number of atoms to decompose is relatively small compared to the number of all atoms in the material. 
First Moment  m = l 
Second Moment  s = l 
Last Update: 2005Jul16