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st: RE: may not use time-series operators on string variables


From   "Nick Cox" <n.j.cox@durham.ac.uk>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: RE: may not use time-series operators on string variables
Date   Wed, 3 Jul 2002 14:53:19 +0100

Lee Chuntao
> 
>    In my dataset there is a variable v1, which is a string 
> variable. I try to use l.v1, after i set the time variable (eg, 
> tsset time). I don't know why stata do not permit timeseries 
> operators on string variables, it seems not reasonable for the 
> lag or lead operators, beyond the difference operators
> 
> i wonder if there is some sort way so that i can use the laged 
> string variable?

Yes. -destring- your string variable first. Stata quite reasonably
wants you to have your variables with numeric meaning held as numeric. 

Nick 
n.j.cox@durham.ac.uk 
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