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Re: st: Event study


From   Richard Goldstein <richgold@ix.netcom.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Event study
Date   Fri, 12 Apr 2013 08:48:40 -0400

following your example:

gen DeltaChange = abnormalreturn - abnormalreturn[_n-1] if
country==country[_n-1]

Rich

On 4/12/13 8:39 AM, Künzel Sven wrote:
> Hello everyone,
> 
> I am doing an Event-Study, which caused some troubles. In order to
> detect abnormal reactions between event day 0 and post-event day + 1
> with the help of the event study, I want to compute the change between
> the days t and t-1. Just below you see a data sample.
> 
> country  abnormalreturn day   DeltaChange
> 1              10        -2
> 1              11        -1       1
> 1              12        0        1
> 1              15        1        3
> 1              16        2        4
> 1              14        3        -2
> 1              13        4        -1
> 1              12        5        -1
> 2              35        -2
> 2              37        -1       2
> 2              39        0        2
> 2              32        1        -5
> 2              35        2        3
> 2              46        3        11
> 2              34        4        -12
> 2              37        5        +3
> 
> Is this possible? Which code would be the right one?
> 
> Thanks for your help....
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