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RE: st: using different macros everytime


From   "Shehzad Ali" <sia500@york.ac.uk>
To   <statalist@hsphsun2.harvard.edu>
Subject   RE: st: using different macros everytime
Date   Sun, 15 Jun 2008 15:06:40 +0100

Thanks, Martin. Let me write down a few details about the analysis I am
trying to run. Please ignore if some of the details are irrelevant. I am
trying to run what they call 'standardisation' in literature. So here is
what I intend to do.

First loop:

1. run treatreg model: treatreg y1 x1 x2 x3 x4 x5, treat(y2=x1 x2 x3 x4 x5
instrument1)

2. then set x1 x2 at their mean values (first generate copies of x1 x2, i.e.
x1_copy x2_copy, then summarize original x1 x2 and replace them with their
mean values). 

3.then predict yhat (so basically it uses coefficients from treatreg but x1
x2 are at their mean values and others at their actual values)

4. drop x1 x2 (which were set at their mean values) and then rename x1_copy
and x2_copy as x1 x2 (so these variables are back as original)

Second loop:

4. Run the same as above but this time setting x2 x4 x5 at their mean values

Going on further, I have a few more loops where the variables which are set
to their mean values are different (no pattern of selection of variables)

What I was thinking of doing was to define sets of macros, i.e. for first
loop, define macro1 as variables to be set at their mean value and macro2 as
variables to be left as original. For second loop, I do the same and it goes
on until I have run all the loops I wanted to run. What I needed help with
is how to assign names to each macro and then I can run a foreach loop so
that the macros are defined at the start and then treatreg and the rest is
run as a loop several times.

I would truly appreciate your help with this.

With sincere thanks,

Shehzad


-----Original Message-----
From: owner-statalist@hsphsun2.harvard.edu
[mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Maarten buis
Sent: 14 June 2008 22:53
To: statalist@hsphsun2.harvard.edu
Subject: RE: st: using different macros everytime

It is usually better practice to work with locals. Anyhow the answer to
your question depends on the kind of pattern you want those models to
follow. Do you want something like

x1 x2 x3
x1 x2 x4
x1 x2 x5

or 

x1 x2 x3
x1 x2 x3 x4
x1 x2 x3 x4 x5

or 

all combinations.

Moreover, do these variables have such systematic names, or do they
have more meaningful, but less systematic names?

-- Maarten

--- Shehzad Ali <sia500@york.ac.uk> wrote:

> Sorry, Martin, it was a mistake. I actually meant global. The models
> I am
> currently using  are:
> 
> * First model:
> 
> global xvar "x1 x2" 
> 
> global zvar "x1 x2 v1"
> 
> treatreg y1 $xvars, treat(y2=$zvars)
> 
> * Second model:
> 
> global xvar "x2 x3 x4"  
> 
> global zvar "x2 x3 x4 v1"
> 
> treatreg y1 $xvars, treat(y2=$zvars)
> 
> Note that I am not just adding one or two additional variables in the
> second
> model, but I am actually using a different set of variables the
> second time.
> Now I want to loop this somehow so that I just write the - treatreg -
> command line once and - foreach - can pick up different sets of
> macros each
> time the loop is run. Can you please suggest the best way to do it?
> 
> Thanks,
> 
> Shehzad
> 
> 
> -----Original Message-----
> From: owner-statalist@hsphsun2.harvard.edu
> [mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Martin
> Weiss
> Sent: 14 June 2008 15:55
> To: statalist@hsphsun2.harvard.edu
> Subject: Re: st: using different macros everytime
> 
> Just a remark: are you sure you want to reference a -local- with the
> $  
> sign? I do not think that this will actually work...
> 
> Zitat von Shehzad Ali <sia500@york.ac.uk>:
> 
> > Hi,
> >
> > This is probably a very simple question but just reflects my
> > inexperience of using foreach loops.
> >
> > I want to run a 2 separate treatreg models with the same y var but
> > different set of x vars. Here is what I am doing:
> >
> > * First model:
> >
> > local xvar "x1 x2"  local zvar "x1 x2 v1"
> >
> > treatreg y1 $xvars, treat(y2=$zvars)
> >
> > * Second model:
> >
> > local xvar "x1 x2 x3"  local zvar "x1 x2 x3 v1"
> >
> > treatreg y1 $xvars, treat(y2=$zvars)
> >
> > Now I want to loop this somehow so that I just write the - treatreg
> -
> > line once but - foreach - can pick up different sets of macros. Can
> you
> > suggest the best way to do it?
> >
> > Thank you,
> >
> > Shehzad
> > *
> > *   For searches and help try:
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> 
> 
> 
> 
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> 


-----------------------------------------
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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