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st: Re: Weighted mean of prices with quantities as weight


From   "Martin Weiss" <martin.weiss1@gmx.de>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: Re: Weighted mean of prices with quantities as weight
Date   Wed, 22 Oct 2008 20:16:27 +0200

Sounds like a straightforward case for frequency weights, but they are not allowed with -egen, mean(). So you might -generate- a variable containing the product of price and quantity and take the mean of that. Also look at -expand- which may help if quantity is rather low...

HTH
Martin
_______________________
----- Original Message ----- From: "Beatrice Crozza" <beatrice.crozza@gmail.com>
To: <statalist@hsphsun2.harvard.edu>
Sent: Wednesday, October 22, 2008 8:02 PM
Subject: st: Weighted mean of prices with quantities as weight


Dear all,

I would like to construct a weighted mean of prices, taking as weight
the quantity for each price.

I am using the command egen(mean)

How can I instruct Stata to use quantities for each price as weight?

Thank you very much.

Best,
Bea
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