Thanks so much! My dataset, however, not only have time gaps but also
may have more than one observation for a single time period. I cannot
sum them up. What can I do in this case?
Aaron
On 10/12/05, Kit Baum <[email protected]> wrote:
> findit mvsumm
>
> Kit Baum, Boston College Economics
> http://ideas.repec.org/e/pba1.html
>
>
> On Oct 12, 2005, at 2:33 AM, Aaron wrote:
>
> > Is there a smart way to calculate the standard deviation of var1 for
> > each id in each year, based on past 5 years' data. For example, for id
> > 18 in year 1996, i want to calculate the st dev of var1 for the past 5
> > years 1991-1995 (here 3 data points). then, for id 18 in year 1998, i
> > want the st dev for var1 for the past 5 years 1993-1997; and then year
> > 2000; and next id, and so on.... i have a large number of id's and
> > year's. many thanks, aaron.
> >
>
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>
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