Stata: Data Analysis and Statistical Software

(1)
foreach x in mpg weight-turn {
                ...
}

    has two elements, mpg and weight-turn, so the loop will be executed twice.

foreach x of varlist mpg weight-turn {
                ...
}

    has four elements, mpg, weight, length, and turn, because list was given the interpretation of a varlist.

So two syntaxs are different.

Also, the following example may be useful.

foreach q in numlist 1/3 {
 some commands
}

foreach q of numlist 1/3 {
 some commands
}

There are also different. More detail you can refer the article 
"Speaking Stata: How to face lists with fortitude" by Professor Nicholas J. Cox.


> -----å??å§?é?®ä»¶-----
> å??件人: "Felix Acker" <facker@vichealth.vic.gov.au>
> å??é??æ?¶é?´: 2013-12-23 13:38:36 (æ??æ??ä¸?)
> �件人: "'statalist@hsphsun2.harvard.edu'" <statalist@hsphsun2.harvard.edu>
> æ??é??: 
> 主�: RE: st: Creating macro varlist for loop - different outcomes with different methods?
> 
> Many thanks wanhaiyou, that did the trick.
> 
> Playing with your code for a bit, I noticed that it is a syntax issue.
> The following code (yours) works:
> 
> foreach aa of varlist x1-z {
> tab `aa', sort
> } 
> 
> But this code would not work:
> 
> local MacroListContainer x1-z 
> foreach aa in `MacroListContainer' {
> tab `aa', sort,
> }
> 
> No idea why that is the case, but happy for the solution. Thanks again.
> 
> Best from Melbourne,
> Felix
> 
> Dr Felix Acker
> Senior Project Officer
> Knowledge and Environments for Health
> Victorian Health Promotion Foundation (VicHealth)
> 15-31 Pelham Street  Carlton  Victoria  3053
> Â 
> 
> -----Original Message-----
> From: owner-statalist@hsphsun2.harvard.edu [mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of wanhaiyou
> Sent: Monday, 23 December 2013 4:10 PM
> To: statalist@hsphsun2.harvard.edu
> Subject: Re: st: Creating macro varlist for loop - different outcomes with different methods?
> 
> Felix Acker 
> Tryï¼?
> 
> clear
> set obs 10
> forv i=1/10 {
> gen x`i'=uniform()
> }
> gen y=uniform()
> gen z=uniform()
> 
> foreach aa of varlist x1-z {
> tab `aa', sort
> }
> 
> Bests,
> wanhaiyou
> Hunan University
> 
> 
> > -----å??å§?é?®ä»¶-----
> > å??件人: "Felix Acker" <facker@vichealth.vic.gov.au>
> > å??é??æ?¶é?´: 2013-12-23 13:04:16 (æ??æ??ä¸?)
> > �件人: "statalist@hsphsun2.harvard.edu" <statalist@hsphsun2.harvard.edu>
> > æ??é??: 
> > 主�: st: Creating macro varlist for loop - different outcomes with different methods?
> > 
> > Hello All,
> > 
> > I have encountered a problem in running a loop on a varlist. My dataset consists of 112 variables, nearly all of them have unique names. I would like to assign them to macros in blocks, for example variable 15 (name = weight) to variable 20 (name = abstinence). I would then like to run a loop on this varlist, using a very basic command such as 'tab' and am expecting separate tables for each variable. When I individually type the variable names for the varlist: 
> > 
> > local TableItems Weight LGA TypeOfWork PosInLocal Aware Abstinence 
> > foreach x in `TableItems' { tab `x', sort }
> > 
> > This works just fine. 
> > However, when I use the hyphen method to create the varlist, the variables seem to be bound different, in that I get an error message for more than two variables, and a two-way table if my varlist consists of two variables only.
> > 
> > local TableItems Weight-Abstinence
> > foreach x in `TableItems' {
> > tab `x', sort
> > }
> > 
> > Would anyone happen to know why this occurs, and how to get around it? In the case of 5 variables, it is easy enough to type them out, but it surely should be possible to do this more efficiently.
> > 
> > Thanks for your help and best from Melbourne, Felix Acker
> > 
> > Dr Felix Acker
> > Senior Project Officer
> > Knowledge and Environments for Health
> > Victorian Health Promotion Foundation (VicHealth)
> > 15-31 Pelham Street  Carlton  Victoria  3053
> 
> 
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