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group.fbi@gmail.com
science forum beginner

Joined: 04 Jun 2006
Posts: 4

Posted: Sun Jun 11, 2006 2:31 pm    Post subject: Binomial Distribution--> Poisson Distribution?? when???

Dear all,

I heard that a Binomial Distribution will be approximately considered
as a Poisson Distribution when the trial number is big enough. I am
wondering how we can specify this number. The number should be 1000,
2000 or what??

Thanks
Ray Koopman
science forum Guru Wannabe

Joined: 25 Mar 2005
Posts: 216

Posted: Sun Jun 11, 2006 10:28 pm    Post subject: Re: Binomial Distribution--> Poisson Distribution?? when???

group.fbi@gmail.com wrote:
 Quote: Dear all, I heard that a Binomial Distribution will be approximately considered as a Poisson Distribution when the trial number is big enough. I am wondering how we can specify this number. The number should be 1000, 2000 or what?? Thanks From http://www.itl.nist.gov/div898/handbook/pmc/section3/pmc331.htm : "The sample size n should be equal to or larger than 20 and the

probability of a single success, p, should be smaller than or equal to
..05. If n >= 100, the approximation is excellent if np is also <= 10."

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