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Re: st: RE: A simple Stata Macro trick?!... I need your help please


From   John Litfiba <cariboupad@gmx.fr>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: RE: A simple Stata Macro trick?!... I need your help please
Date   Wed, 27 Jul 2011 20:25:51 +0200

Dear Nick

Of course!
Many thanks

John

On 27 July 2011 19:59, Nick Cox <n.j.cox@durham.ac.uk> wrote:
> I guess that you want
>
> foreach item in X Y {
>        bysort ID (DATE): gen `item'5=`item'[_n+5]
> }
>
> as otherwise the groups defined by -ID DATE- will just be single observations.
>
> Nick
> n.j.cox@durham.ac.uk
>
> John Litfiba
>
> I do not know what is wrong in the following code:
>
> X and Y are variables in my database
>
> foreach item in  "X" "Y" {
> bysort ID DATE: gen `item'5=`item'[_n+5]
> }
>
> That is, I would like to use a loop over these 2 variables names X and
> Y that would allow the creation of new numeric variables called "X5"
> and "Y5" and whose value are lagged copies of existing variables X and
> Y... (5 row later)
> It seems that the new variable are created correctly, but Stata do not
> understand that it must EVALUATE the variable stored in `item[_n+5] :
> so I get a missing value instead of the numeric value stored at the
> nth+5 row...
>
>
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