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From |
James Bernard <jamesstatalist@gmail.com> |

To |
statalist@hsphsun2.harvard.edu |

Subject |
Re: st: cumulative summation |

Date |
Tue, 26 Feb 2013 16:39:27 +0800 |

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/ * * 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/

**Follow-Ups**:**Re: st: cumulative summation***From:*Nick Cox <njcoxstata@gmail.com>

**Re: st: cumulative summation***From:*James Bernard <jamesstatalist@gmail.com>

**References**:**st: cumulative summation***From:*James Bernard <jamesstatalist@gmail.com>

**Re: st: cumulative summation***From:*Nick Cox <njcoxstata@gmail.com>

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