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st: RE: Re: How to refer to scalars with a wildcard


From   "Nick Cox" <n.j.cox@durham.ac.uk>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: RE: Re: How to refer to scalars with a wildcard
Date   Mon, 12 Apr 2004 19:49:53 +0100

Correct. Sorry about that. 

Nick 
n.j.cox@durham.ac.uk 

> -----Original Message-----
> From: owner-statalist@hsphsun2.harvard.edu
> [mailto:owner-statalist@hsphsun2.harvard.edu]On Behalf Of Friedrich
> Huebler
> Sent: 12 April 2004 19:42
> To: statalist@hsphsun2.harvard.edu
> Subject: st: Re: How to refer to scalars with a wildcard
> 
> 
> Nick,
> 
> Thank you, your loop works with one correction: the -else- line does
> not need a comma.
> 
>   else local ages "`ages'age`i'"
> 
> Friedrich Huebler
> 
> --- Nick Cox <n.j.cox@durham.ac.uk> wrote:
> > I'd modify your -forval- loop 
> > and build up a list of names one
> > by one (add semi-colons as desired) 
> > 
> > forvalues i = `start'/`end' {
> > 	sum income if age==(`i'+startage-1)
> > 	scalar age`i' = r(mean)
> > 	if `i' <  `end' local ages "`ages'age`i',"
> > 	else local ages "`ages',age`i'"
> > }
> > 
> > Then 
> > 
> > matrix data = startage,endage,male,female,`ages';
> > 
> > Nick 
> > n.j.cox@durham.ac.uk 
> > 
> > Incidentally, it looks as if your -summarize- should 
> > be done ", meanonly". 
> > 
> > Friedrich Huebler
> > > 
> > > I work with household survey data and would like to create
> > summary
> > > statistics disaggregated by gender, age and other
> > characteristics. In
> > > my do-file the summary statistics are stored as scalars and then
> > > converted to a matrix. I encountered a problem with the
> > disggregation
> > > by age because I use varying age ranges. Let's assume I want to
> > > summarize income by gender and age (for ages 20-24 in this case)
> > with
> > > the following data.
> > > 
> > >   age      male    income
> > >    20         1         6
> > >    21         1         7
> > >    22         0         5
> > >    23         0         9
> > >    24         1         6
> > > 
> > > * Set start and end age (NOTE: THE AGES VARY);
> > > scalar startage = 20;
> > > scalar endage = 24;
> > > * Summarize income by gender;
> > > sum income if male==1;
> > > scalar male = r(mean);
> > > sum income if male==0;
> > > scalar female = r(mean);
> > > * Summarize income by age;
> > > local start = 1;
> > > local end = (endage - startage + 1);
> > > forvalues i = `start'/`end' {;
> > >   sum income if age==(`i'+startage-1);
> > >   scalar age`i' = r(mean);
> > >   };
> > > 
> > > The problem is in the following step. Because I use varying age
> > > ranges I cannot list all age variables individually (age1, age2,
> > > age3, ...) but want to refer to them with a wildcard character.
> > > 
> > > drop _all;
> > > matrix data = startage,endage,male,female,age*;
> > > svmat data;
> > > 
> > > This leads to this error message:
> > > 
> > >   age* not found
> > >   r(111);
> > > 
> > > Can the matrix be created without listing all scalars
> > individually?
> 
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