st: Re: question on looping

[Kit Baum <baum@bc.edu>]

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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