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st: Poisson Distribution


From   "Gauri Khanna" <gwkhanna@hotmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   st: Poisson Distribution
Date   Mon, 15 May 2006 14:47:49 +0000

Dear Statalist,

I would like to run a Poisson Distribution for a count variable; number of breakdowns(N) as a function of hours of tubewell operation (H).

The poisson distribution would be

exp(-Mu*H).[(Mu.H)^N]/N!

1. To do this, I would have to run the following regression:
Poisson Breakdowns Hours - Is this correct?

However, I am not sure whether to have a constant term or not. So what should I do?

2. I would like to estimate the parameter(Mu) using Max. Likelihood techniques. Is this already produced from the simple Poisson regression command?

As far as my understanding goes, the Poisson distribution utlitises the Max Likelhiood technique and not OLS as the dependant variable takes on few values that are non-negative integers.

Thank you for your help.

Regards,

Ms. Gauri Khanna

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