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Re: st: Capturing names of dropped variables in Probit/Logit


From   Maarten buis <maartenbuis@yahoo.co.uk>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Capturing names of dropped variables in Probit/Logit
Date   Mon, 7 Apr 2008 09:02:02 +0100 (BST)

--- Partha Deb <partha.deb@hunter.cuny.edu> wrote:
> I'm wondering how it might be possible to capture the name of a
> variable dropped by -probit- or -logit- because it "predicts failure
> perfectly".

-indeplist-, downloadable from -ssc-, gives by default a list of
independent variables that have not been dropped. You can use that list
together with Stata's facilities of handeling list in macros, see: 
-help macrolists-, to get to the variables that have been removed. See
the example below:

*--------- begin example -----------
sysuse auto, clear
recode rep78 1/3=0 4/5 =1
gen domestic = !foreign

local rhs "foreign domestic"
logit rep78 `rhs'

indeplist, local
local removed : list rhs - X
di "`removed'"
*---------- 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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