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st: loop code question


From   "Kaur, Dupinderjeet" <dxk110730@utdallas.edu>
To   "statalist@hsphsun2.harvard.edu" <statalist@hsphsun2.harvard.edu>
Subject   st: loop code question
Date   Sat, 11 Aug 2012 21:12:56 +0000

Dear All,

I have two questions on using a loop to run regressions. 

1)	I want to use pair of variables together when doing foreach, right now to do this I am doing a double loop and delegating combinations that I don't want.
Here is the code, I need A a, B b, C c combination. How can I do this in a single loop?
                foreach x in A B C{
                                foreach y in a b c{ 
                                eststo: quietly reg dependent independent  `x' `y' 
                                }
                }
2)	I have panel data with ID and year. I want to run event regressions. For example if my data is from 1990 to 2010, and I have identified events in 1994, 
1998, 2005 then I want to run three regressions capturing 2 years data on both sides of the event year. Can I do a categorical variable that differentiates 
these events and then do a loop for regression, I am not sure how to do this exactly.

I am a second year PhD student and new to Stata, so any guidance on these questions would be greatly appreciated.

Thank you.
Dupinder

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