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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 18:31:40 +0800 |

Thanks Nick! I used -collapse- that you suggested...It was the easiest to do Many Thanks, James On Tue, Feb 26, 2013 at 6:23 PM, Nick Cox <njcoxstata@gmail.com> wrote: > Also > > bysort group year : keep if _n == _N > > On Tue, Feb 26, 2013 at 9:05 AM, Nick Cox <njcoxstata@gmail.com> wrote: >> 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/ * * 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/

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

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

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

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

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

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