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Re: st: Weighted summing in a loop for members of a group
From
Maarten buis <[email protected]>
To
[email protected]
Subject
Re: st: Weighted summing in a loop for members of a group
Date
Wed, 23 Mar 2011 17:27:51 +0000 (GMT)
--- On Wed, 23/3/11, Timm Klare wrote:
> For each NUM_ID and YEAR I need to calculate an new
> variable. It should sum the asset-weighted tax rate
> differences between each NUM_ID YEAR and all other
> companies in each group:
>
> (sigma sign) (TAXRATE[NUM_ID] –
> TAXRATE[i])*(TOTAL_ASSETS[i]/GROUP_TOTAL_ASSETS)
>
> Where i corresponds to all other companies in the observed
> group. How can this be done? Is there a “sigma sign” like
> summing function in STATA?
Looks like an -egen- problem in combination with -by-,
see -help egen- (in particular the -total()- function) and
-help by-.
Hope this helps,
Maarten
--------------------------
Maarten L. Buis
Institut fuer Soziologie
Universitaet Tuebingen
Wilhelmstrasse 36
72074 Tuebingen
Germany
http://www.maartenbuis.nl
--------------------------
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