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RE: st: RE: basic commands question


From   "Nick Cox" <n.j.cox@durham.ac.uk>
To   <statalist@hsphsun2.harvard.edu>
Subject   RE: st: RE: basic commands question
Date   Thu, 6 May 2004 11:56:49 +0100

Nick is correct. I overlooked this crucial 
detail! The parentheses only make sense 
in some context like 

. by <varlist> ( <varlist2> ) : ... 

so that 

. by (<varlist2>) : ... 

is meaningless to Stata, irrespective
of sort order. 

I think it remains true that something 
like -contract- is your best approach 
to produce another dataset of frequencies. 

Thanks to those who refrained from referring
me to the tutorial on -by:- in SJ 2(1) 2002. 

Nick Winter

> > > Or..
> > > why does the following code not work?
> > >
> > > . by (var1 var2): egen freq=count(var3)
> > >
> > > I want to count the number of occurences  (var3) for each
> > > year for each
> > > country.  how do i save this reorganized result in a .dta file?
> 
> You need to omit the parentheses:
> 
>          . by var1 var2: egen freq=count(var3)
> 
> (And be sure you've previously sorted on var1 var2).

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