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Re: st: Seeking help in stata


From   "Anders Alexandersson" <andersalex@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Seeking help in stata
Date   Fri, 14 Dec 2007 10:24:17 -0500

Thaddee Badibanga <tbadibanga@yahoo.fr> wrote:

> I'd like to create an index from a
> variable which is a pseudo numeric or a string(numeric
> as well character). This index will allow me to
> eliminate some observations in the dataset. To give
> you an idea, the variable I termed codeks is as
> follows:
> codeks:101 102 01A 01X 0AX ...103 ... 111 112 ...11111
>
> I'd like to create an index that assigns 1 if codeks
> includes A or X or AX and 0 otherwise. I have done
> this in other programs. In one program for instance,
> this can be done as:
> found=indexc(codeks,"A","X")
>
> I will really appreciate your help. I have spent more
> than 3 hours without success.

I am not aware of a similar function in Stata. But the regexm() string
function combined with a Boolean expression should work. This FAQ
explains Boolean expressions in Stata:
http://www.stata.com/support/faqs/data/trueorfalse.html
For example, regexm(codeks, "A") would evaluate to 1 if codeks has the
string A, and to 0 otherwise.

I have not tried the following, but I think it will work as you intended:
gen found = sum( regexm(codeks, "A") + regexm(codeks, "X") ) >= 1

Anders Alexandersson
andersalex@gmail.com
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