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st: year-wise rank function for multi-level data


From   Apalak Khatua <[email protected]>
To   [email protected]
Subject   st: year-wise rank function for multi-level data
Date   Wed, 18 May 2011 22:44:45 +0530

Dear List,

I am using unbalanced panel data. There are multiple firms (firm_code)
within a business group (bg_code). I am considering sales for each
firm (i.e. firm_sales) as a proxy for firm size. So business group
size/sales (bg_sales) would be the summation of all firm-level sales
of that particular business group for that particular year (time).
Which I am calculating by:

egen bg_sales = total( firm_sales), by( bg_code time)

Now I would like to get the year-wise rank variable of all business
groups (bg_code) in terms of size (i.e. bg_sales) . Here the unique id
can be defined by bg_code and year (not firm_code). The rank variable
for the biggest business group (in terms of bg_sales or size of the
business group) for that particular year should be 1 and so on. How to
write the code to get this rank variable against each bg_code for each
year?

Thanks in advance.
Regards,
Apalak Khatua
Doctoral Student
IIM Calcutta - INDIA
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