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Re: st: -collapse- and weights


From   Philipp Rehm <Philipp.Rehm@gmx.de>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: -collapse- and weights
Date   Mon, 13 Nov 2006 09:19:20 +0100

clear

input week price quantity str1 Manufacturer
1 3.5 40 A
1 9.1 50 B
1 10.5 70 B
1 20 80 B
2 45 70 A
2 3.1 100 A
2 15 10 A
2 28 15 B
end

collapse (mean) price [aweight=quantity], by(week Manufacturer)

reshape wide price, i(week) j(Manufacturer) string

rename priceA weigthedprice_A
rename priceB weigthedprice_B

HTH,
Philipp


Rodrigo Martell wrote:
I don't think this got through to the list since I didn't receive it after I sent it. Anyway, here it goes again:

I have a data set that looks like this:

--------------------------------------------------------------------------------------------

week price quantity Manufacturer

1 3.5 40 A

1 9.1 50 B

1 10.5 70 B

1 20 80 B

2 45 70 A

2 3.1 100 A

2 15 10 A

2 28 15 B

--------------------------------------------------------------------------------------------

I ultimately want to end up with this:

--------------------------------------------------------------------------------------------

week weigthedprice_A weightedprice_B

1 3.5 13.95

2 20.05556 28

-------------------------------------------------------------------------------------------


In other words, I want to sum the quantity-weighted price for each week by Manufacturer.

I used the following but can't quite get the weights option right:

-collapse (mean) price [*? some weights option here,I can't quite get it*], by(week Manufacturer)-

-reshape wide price, i(week) j(Manufacturer) string-

I'd appreciate any help.

Thanks!

Rodrigo



Rodrigo Martell

<http://www.frontier-economics.com>
Frontier Economics Pty. Ltd.
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