POISSON Function

Returns the probability from a Poisson distribution

Category: Probability

See: 'CDF Function' on page 418

Syntax

POISSON ( m,n )

Arguments

m

• is a numeric mean parameter.

• Range: m ‰

n

• is an integer random variable.

  Range: n ‰

Details

The POISSON function returns the probability that an observation from a Poisson distribution, with mean m , is less than or equal to n . To compute the probability that an observation is equal to a given value, n , compute the difference of two probabilities from the Poisson distribution for n and n - .

Examples

SAS Statements	Results
x=poisson(1,2);	0.9196986029