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


From   Friedrich Huebler <huebler@rocketmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   st: Re: How to refer to scalars with a wildcard
Date   Mon, 12 Apr 2004 11:42:27 -0700 (PDT)

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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