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st: Re: RE: Re: automating a series of equations


From   "Don Spady" <[email protected]>
To   <[email protected]>
Subject   st: Re: RE: Re: automating a series of equations
Date   Fri, 9 May 2003 10:31:45 -0600

Thank you both.  I will give it a try today.

Donald Spady
Dep't of Pediatrics, University of Alberta
(780) 407-1244

Nature has no reset button.
----- Original Message ----- 
From: "Nick Cox" <[email protected]>
To: <[email protected]>
Sent: Friday, May 09, 2003 04:32
Subject: st: RE: Re: automating a series of equations


> Scott Merryman replied to Don Spady 
> > > 
> > > I need some help with repeating tasks.  I am doing a series of
> > > logistic regressions and want to automate the task.
> > > 
> > > 
> > > Say I have an equation
> > > logistic  depvar indepvar sexfm interactionterm if agegrp == X
> > > lincom indepvar + interaction term (sexfm+indepvar)
> > > I have about 8 depvars and 25 indepvars and 3 agegrps.
> > > I want to do all 8 depvars and 25 indepvars at 3 agegrps 
> > and do a lincom
> > > on each outcome.
> > > it is easy to automate the system using for var "x": if 
> > you are not
> > > doing lincom.  Use of lincom introduces a new command and 
> > I don't know
> > > how to
> > > deal with it.
> > > How do I do a for var depvar1 ... depvar10 and then do a 
> > lincom for each
> > > equation as it comes up.  I think it needs a loop within 
> > a loop but I am
> > > not at all sure how to do that.
> > > 
>  
> > I think something like this should work:
> > 
> > levels agegrp , local(levels)
> > foreach var of varlist dep1 - dep10 {
> >         foreach l of local levels {
> >              logit `var' indepvar1 - indepvar25  if agegrp == `l'
> >              lincom indepvar1 + indepvar2  
> >       }
> >  }
> > 
> 
> Note that -levels- was added to official Stata, 
> i.e. version 8, on 16 April 2003. 
> 
> A -levels7- for Stata 7 remains part 
> of the -levels- package on SSC. 
> 
> Alternatively, -vallist-, which requires 
> only Stata 7, is on SSC with a different 
> default and indeed more features. -vallist- 
> is now maintained by Patrick Joly. 
> 
> Nick 
> [email protected] 
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