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st: RE: accessing variables created within a foreach loop


From   "Alex Ogan" <aogan@ArrowstreetCapital.com>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: RE: accessing variables created within a foreach loop
Date   Fri, 9 Jun 2006 09:38:57 -0400

I'm not going to try to figure out the exact syntax with respect to
single/double/compound quotes.  However, you will be able to do
something similar to this:

Before starting the loop, create a local macro:

local MyVarlist ""

Within the loop, you can add to it:

local MyVarList = "`MyVarList'" + " " +  "`z'`i'"

Again, the quoting/spacing you need might be slightly different -- but
it looks like you needed to know how to append to a local macro varlist,
which this shows.

Hope this helps,
Alex


-----Original Message-----
From: owner-statalist@hsphsun2.harvard.edu
[mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Vera E.
Troeger
Sent: Friday, June 09, 2006 8:08 AM
To: statalist@hsphsun2.harvard.edu
Subject: st: accessing variables created within a foreach loop

I have the following problem, for a larger program I try to use the unit
means of some regressors (from a syntax varlist) in a later estimation.
I manage to get the unit means for all specified variables in varlist
(zvar in this case)
the part of the program would look as follows:



program define test
local i = "_m"
local zvar z1 z2 z4
    foreach z of local zvar {
        sort `ivar'
        tempvar `z'`i'
        by `ivar': egen ``z'`i''= mean(`z')
    }
end
test


what I do not manage is to "put" the newly generated ``z'`i'' variables
(from the loop) into a local macro (a varlist that I can use later on)
since I cannot refer to the `z'`i' once the loop is terminated. within
the loop I have no clue how to append each new generated variable
(`z'`i' ) to a local macro varlist. I know in this specific program the
newly generated variables are stored as local macros with the names
z1_m,
z2_m and z4_m. but for this to be part of an estimator the variables in
zvar are specified by the user and I then cannot directly refer to them.
I hope I made myself sufficiently clear.Any advise would be
highly appreciated.
many thanks,
Vera

_______________________________________
Vera E. Troeger
Lecturer in Political Science
University of Exeter
Department of Politics
Amory Building
Rennes Drive
Exeter, Devon EX4 4QJ
UK
phone: +44.1392.264632

e-mail: v.e.troeger@exeter.ac.uk

Home:
39 Altamira
Topsham, Exeter EX3 0AQ
UK




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