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Re: st: -varlist- using char[]?


From   Jeph Herrin <jeph.herrin@yale.edu>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: -varlist- using char[]?
Date   Fri, 14 Nov 2008 08:07:29 -0500

Thanks for the tip about -ds-, that will at least answer
my first question in the something close to affirmative.

And yes, I did simplify in my examples, because I was too
lazy to check my code. Similarly (per Nick's comment), I
know that -summarize if <cond>- was completely out of line,
but thought it was worth a thousand words of trying explain
what I wanted to do.

Had never noticed that feature of -ds-, quite useful. Though
would be nice it was extending to matching particular char
values. Eg,

  . ds, has(char scale KCCQ)


thanks,
Jeph




Johannes Geyer wrote:
>> This has been helpful in a lot of programming contexts.
>> For instance, I currently pull out the variables that form
>> the KCCQ survey scale by looping over ALL the variables
>>
>>   foreach V of _all {
>>    local scale = V[scale]
>>    if "`scale'"=="KCCQ" {
>>       ...
>>    }
>>   }
>>
> 
> I have a question related to your code:
> 
> local scale = V[scale]
> 
> does this work or did you simplify?
> 
> I get an error message, Stata does not know what
> "scale" is, so I have to write
> 
> local scale = "`V[scale]'"
> 
> furthermore "V" is a local, the code would be:
> 
> local scale = "``V'[scale]'"
> 
> You could also use -ds-:
> 
> ds, has(char scale)
> 
> then the code would read:
> 
> /***************/
> qui ds, has(char scale)
> foreach v of varlist `r(varlist)' {
>  
>         local scale = "``v'[scale]'"
>         if "`scale'"=="KCCQ" {
>         ...
>                 }
>         }
> /***************/
> 
> Johannes
> 
> 
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