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st: changes of variables over time in panel data


From   Wen Xia Ge <wenxia.ge@mail.mcgill.ca>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: changes of variables over time in panel data
Date   Tue, 2 Sep 2008 12:32:04 -0400

Dear Statalist users,

My panel data is composed of bond issues of thousands of firms over more
than 10 years. I want to look at the changes of several firm-level
variables prior to bond issues and post bond issues, that is, I want to
look at the changes of several firm-level variables in year t-2, t-1, t,
t+1 and t+2, where bond issues are in year t. 

I know we can generate lagged variables (one year lag or two year lag)
in STATA, but I have no clue how to achieve the above goal. Any
suggestions?

Thank you,

Wenxia


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