David Brat
> I need to calculate a new variable which takes
> the std. dev. of the previous 80 observations of an
> existing variable.
>
> I have tried the egen and called in for help and reached a dead end.
> I have also tried the egen using "in -80/l" and this did not work.
I believe that -mvsumm- by Kit Baum and myself will serve.
Install it from SSC using -ssc- in Stata 7 or Stata 8.
There is no reason, incidentally, to expect that invoking -in- once
implements moving windows. -in- just selects a fixed
observation range, once and once only.
Nick
[email protected]
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