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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 09:05:12 +0000 |
It works, but does not do what you want. Many solutions, one of which is egen nties = max(ties), by(group year) See also -help collapse- on your last. Nick On Tue, Feb 26, 2013 at 8:39 AM, James Bernard <jamesstatalist@gmail.com> wrote: > Thanks Nick, > > I have missing values in my list, so it seems that the command is not > working, because it sets many of the values to . (missing). > > I gave you the simplifies version. In fact, I am using loops and > macros to do this > > Then, instead would it be possible to write a comand that can detect > that for firm A in 1990, 2 is the larger one. > > Alternatively, would it be possible to ask the program to keep only > the last observation of every group (a group defined by firm and year) > > Thanks a gain, > James > > > On Tue, Feb 26, 2013 at 3:49 PM, 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. * * 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/