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| From | Nick Cox <njcoxstata@gmail.com> |
| To | statalist@hsphsun2.harvard.edu |
| Subject | Re: st: cumulative summation |
| Date | Tue, 26 Feb 2013 07:49:50 +0000 |
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. * * For searches and help try: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/faqs/resources/statalist-faq/ * http://www.ats.ucla.edu/stat/stata/