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RE: st: RE: Generating grouped variable list of xi'd variables via column names


From   "Maarten Buis" <M.Buis@fsw.vu.nl>
To   <statalist@hsphsun2.harvard.edu>
Subject   RE: st: RE: Generating grouped variable list of xi'd variables via column names
Date   Fri, 13 Jul 2007 14:53:56 +0200

--- K Jensen wrote:
> I was wondering how easy it would be to convert the results in
> model_I
> di "`model_I'"
>  _Idrug_2 _Idrug_3 _Irandcat_2 _Irandcat_3
> to the form _Idrug* _Irandcat*

A slightly messy solution is shown below. As you are probably 
using this repeatedly in your do-file it might be useful to 
create a program at the beginning of your do-file that does 
this (call it -ab_i-), so in the remainder of your do-file you 
can refer to -ab_I- whenever you want to do this. This way 
your do-file will look cleaner and easier to understand (and 
debug).

*------------- begin example -------------
capture program drop ab_I
program define ab_I
	*!version 1.0.0 MLB 13 July 2007
	/*get list of all _I vars*/
	qui indeplist, local
	unab all_I : _I*
	local model_I : list all_I & X

	/*abbreviate _I vars*/
	local min_I : subinstr local model_I "_I" "", all
	foreach stub of local min_I {
		gettoken temp : stub, parse("_")
		local ab "`ab' _I`temp'*"
	}
	local ab : list uniq ab
	c_local ab "`ab'"
end

sysuse cancer, clear
stset studytime, fail(died)
gen randcat= ceil(3*uniform())
xi:stcox i.drug age i.randcat
ab_I
di "`ab'"
*--------------- end example -------------
(For more on how to use examples I sent to the Statalist, see
http://home.fsw.vu.nl/m.buis/stata/exampleFAQ.html )

Hope this helps,
Maarten

-----------------------------------------
Maarten L. Buis
Department of Social Research Methodology 
Vrije Universiteit Amsterdam 
Boelelaan 1081 
1081 HV Amsterdam 
The Netherlands

visiting address:
Buitenveldertselaan 3 (Metropolitan), room Z434 

+31 20 5986715

http://home.fsw.vu.nl/m.buis/
-----------------------------------------




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