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Re: st: If-command not accurate


From   "Dimitriy V. Masterov" <dvmaster@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: If-command not accurate
Date   Tue, 7 Aug 2012 09:34:21 -0700

You are misunderstanding how if works. This is a common misconception.
The first pass through the loop, the condition "if PF_dy == PF_ret6"
means if the first observation of PF_dy equals PF_ret6, do some stuff.
You probably want -if "`var"=="PF_ret6" {-. This does the string
comparison you had in mind.

DVM

On Tue, Aug 7, 2012 at 9:26 AM, Daniel Brodback <schmani@gmx.de> wrote:
> Dear all,
>
> in a foreach-loop, I am trying to "catch" a specific case and therefore I implement this with an if-command.
>
> For my varlist, I want certain commands to be executed but when var "PF_ret6" occurs, I need different commands.
>
> I implemented this in the following way (Stata SE 11.2):
>
> foreach var of varlist PF_dy-PF_ret6 {
>         if `var' == PF_ret6 {
> ...
> }
> else
> {
> }
> }
>
> The weird behavior is, that for the first variables everything works as expected. But when the variable prior to PF_ret6 is reached (named PF_lret6), it also enters the if-condition.
> Is there a way to assure that the if-command only uses PF_ret6 but not PF_lret6?
>
> Kind regards,
>
> Daniel
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