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Re: st: cumulative summation


From   Nick Cox <njcoxstata@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: cumulative summation
Date   Tue, 26 Feb 2013 08:17:50 +0000

Note that

egen ties = total(<something>), by(firm year)

presumably could have got you there directly.

Nick

On Tue, Feb 26, 2013 at 7:49 AM, Nick Cox <njcoxstata@gmail.com> wrote:
> bysort firm year (ties) : replace ties = ties[_N]
>
> Nick
>
> On Tue, Feb 26, 2013 at 7:08 AM, James Bernard <jamesstatalist@gmail.com> wrote:
>
>> I have used the sum function to calculate a variable in  a panel data.
>>
>> Firm        Year      ties
>> -----------  ----------    -------
>> A             1990      1
>> A             1990       2
>> A             1991       1
>> B             1990       0
>> B             1990       1
>> B             1990        3
>> C             1990        0
>> C             1991        0
>> C             1992        0
>>
>> The issue is that the variable ties which is the number of ties a firm
>> has formed in a year is a cumulative sum of something and, therefore,
>> for a company like A the final number of ties in year 1990 should be
>> 2. I need the program to write the same number (final value of the
>> cumulative sum) instead of 1.
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