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# Re: st: Optimizing recoding procedures

 From Nick Cox To statalist@hsphsun2.harvard.edu Subject Re: st: Optimizing recoding procedures Date Tue, 11 Dec 2012 17:41:19 +0000

```if x==1 | x==2 | x==3 | y==1 | y==2 | y==3

could be

if inlist(x, 1, 2,3) | inlist(y, 1, 2, 3)

but

replace x = 0 if x==1 & x==2 & x==3 & y==1 & y==2 & y==3

will be legal but makes no sense. x can't be 1 and 2 at the same time;
similar comment for y.

There seem to be several other typos in your posting. I don't know of
-egen- functions -ral()- or -rany()-.

Nick

On Tue, Dec 11, 2012 at 4:56 PM, Thomas Lux <tholux2000@yahoo.de> wrote:

> I am trying to optimize my data recoding procedures (in Stata 11).
> With the inlist-function it is possible to reduce the syntax in such a way:
>
>
>
> gen x = 1 if z==1
>
> replace x = 0 if x==1 | x==2 | x==3
>
>
> gen x = 1 if z==1
> replace x = 0 if inlist(y, 1, 2, 3)
>
>
> However, I am looking for functions that allow a reduction in a situation with two variables in the (second) if statement:
>
>
> gen x = 1 if z==1replace x = 0 if x==1 | x==2 | x==3 | y==1 | y==2 | y==3
>
> and:
>
>
> geb x = 1 if z==1replace x = 0 if x==1 & x==2 & x==3 & y==1 & y==2 & y==3
>
>
> Is there a way of doing this via a DIRECT function in the if statement (that is without taking the indirect route via "egen ral" respectively "egen rany")?
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