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Re: st: Creating a variable: sum of past 5 years


From   Nick Cox <njcoxstata@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Creating a variable: sum of past 5 years
Date   Sun, 8 Apr 2012 00:09:49 +0100

-collapse- to annual sales totals, use -sum()- and -merge back in.

Nick

On Sat, Apr 7, 2012 at 8:29 PM, Mike Kim <kalisperos@gmail.com> wrote:
> Dear Statalisters,
>
> I would like to create 'sale5yr' which is the sum of total sales for the
> past 5 years except its own sale. Can anyone please help me create this
> variable? For example,
>
> first row of 'sale5yr'=21+20+19+18+17+16+15+14+13+12=165
> second row of 'sale5yr'=22+20+19+18+17+16+15+14+13+12=166
> third row of 'sale5yr'=19+18+17+16+15+14+13+12+11=135
> ......
>
> year    sale    sale5yr
> 2005    22      165
> 2005    21      166
> 2004    20      135
> 2004    19      136
> 2003    18      ......
> 2002    17
> 2002    16
> 2002    15
> 2002    14
> 2001    13
> 2000    12
> 1999    11
> 1998    10
> 1998    9
> 1998    8
> 1996    7
> 1996    6
> 1995    5
> 1994    4
> 1994    3
> 1993    2
> 1992    1

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