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Re: st: Creating new variables from a STATA panel dataset


From   Lucio Vinhas de Souza <lvdesouza@yahoo.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Creating new variables from a STATA panel dataset
Date   Wed, 3 Aug 2011 10:18:08 -0700 (PDT)

Thanks, Nick. Now, as I have several hundred variables (as I indicated in my earlier post, which include common country codes), it is not really feasible that I write all of them in a command. I would assume there should be some sort of "wild card" notation that one could use to replace a part of the varname in STATA. If I am correct, which would be this?

Lucio.

--- On Wed, 3/8/11, Nick Cox <njcoxstata@gmail.com> wrote:

> From: Nick Cox <njcoxstata@gmail.com>
> Subject: Re: st: Creating new variables from a STATA panel dataset
> To: "statalist@hsphsun2.harvard.edu" <statalist@hsphsun2.harvard.edu>
> Date: Wednesday, 3 August, 2011, 19:10
> 
> * cannot be part of a variable name.
> 
> Nick
> 
> On 3 Aug 2011, at 17:14, Lucio Vinhas de Souza <lvdesouza@yahoo.com>
> wrote:
> 
> > Dear All,
> > 
> > Very basic question, for someone that has not used
> STATA for several years now: I have a panel dataset
> (adequately tis t and iis id) of several hundred variables,
> and I want to:
> > 
> > a)    Generate new variables
> > b)    Run a xtbond from those new variables
> > 
> > I have been trying to generate new variables which are
> change rates form the existing ones. The names of the
> existing variables are all variations from the format
> “countrycode_extension”. I have been trying to
> > 
> > gen
> “*_extension_new”=((“*_extension”-“*_extension_new”[_n-1])/
> “*_extension_new”[_n-1])
> > 
> > and always get the message
> > 
> > *invalid name
> > 
> > 
> 
> *
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