---
name: "ppoiss"
section: "3m"
platform: "linux"
package: "iraf"
version: "2.11.3-2"
release: "Debian 3.0 (Woody)"
platforms: ["linux"]
url: "https://new.carta.tech/ppoiss"
---

# ppoiss(3m)

## NAME

ppoiss

## DESCRIPTION

function ppoiss.f

source\
   Bevington, page 39.

purpose\
   evaluate Poisson probability function

usage\
   result = ppoiss (nobs, averag)

description of parameters\
   nobs   - number of items observed\
   averag - mean of distribution

subroutines and function subprograms required\
   factor (n)\
     calculates n factorial for integers