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Re: st: Re: program to generate variable list as input for other program

From   Maarten buis <[email protected]>
To   [email protected]
Subject   Re: st: Re: program to generate variable list as input for other program
Date   Mon, 11 Jan 2010 02:14:02 -0800 (PST)

--- On Mon, 11/1/10, Bob <[email protected]> wrote:
> In principle, my script works now but it is very slow, I
> would say like factor 20 to the version of the program where
> all variable names are spelled out and no loops are used.
> The program is used in an evaluator function for a
> regression and thus called many times. I suppose it has to
> do with for loops and the frequent string replacements
> coming with the macro replacements of the `var's. I am using
> a lot of macros to do a number of calculations. 
> Is there a better way of getting something equivalent to
> "variables" in other programming languages so that I can
> reduce the string replacements? 

That depends what it is exactly that you want to do. I 
an guessing you want to select a number of variables based
on some (to me unknown) criterium. It probably can be speeded
up, but how depends on the cireterium.

> Is there a guide on how to do efficient programming and
> flow control in STATA?

You can look at: Christopher F. Baum (2009) "An Introduction 
to Stata Programming", College Station: Stata Press.

Hope this helps,

Maarten L. Buis
Institut fuer Soziologie
Universitaet Tuebingen
Wilhelmstrasse 36
72074 Tuebingen


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