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st: product function


From   "Dimitriy V. Masterov" <dvmaster@lily.src.uchicago.edu>
To   statalist@hsphsun2.harvard.edu
Subject   st: product function
Date   Tue, 25 May 2004 11:43:00 -0500 (CDT)

I would like to plot the probability that two people share a birthday as a
function of the number of people in the room n. The formula is

	1-product((366-i)/365,i,1,n)

In TeX, it would be

	1-\dprod\limits_{i=1}^{n}\frac{366-i}{365}.

If I have a variable n={1,...,50}, how can I define the product within
Stata? There does not seem to be math function that can do this.

DVM


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Dimitriy V. Masterov

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