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


From   "Lee Chuntao" <chtl@econ.hku.hk>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: Re: RE: may not use time-series operators on string variables
Date   Wed, 3 Jul 2002 22:50:22 +0800

But Why shoud my variable be numeric, that is not reasonable. In fact, my variable is industry code, never ever be numeric.

I do not think Nick's answer helpful

In this aspect, i think stata should admit its shortcomings and fix the problem asap


----- Original Message ----- 
From: "Nick Cox" <n.j.cox@durham.ac.uk>
To: <statalist@hsphsun2.harvard.edu>
Sent: Wednesday, July 03, 2002 9:53 PM
Subject: st: RE: may not use time-series operators on string variables


> 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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