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Re: st: Combining ifs


From   "Eva Poen" <eva.poen@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Combining ifs
Date   Fri, 25 Apr 2008 16:57:59 +0100

2008/4/25 Maarten buis <maartenbuis@yahoo.co.uk>:
> --- Gabi Huiber <ghuiber@gmail.com> wrote:
>  > Can you combine the programmer's if with the in-line if?
>  >
>  > General idea:
>  >
>  > if var1<`k' {
>  > replace var2=. if var3=="`w'"
>  > }
>
>  This is legal, i.e. Stata won't complain, but it will probably not do
>  what you want: -if var1 < `k'- means "if the first value of the
>  variable var1 is less then `k'"

I second Maarten. In your application, however, this should not be a
problem, since you compare the value of one local macro to the value
of another:

if `hi'<`myseries_n' {
  ...
}

The -if- programming command is just the way to do that. Be careful
when using variables in the -if- programming command, though, as
Maarten explained. -if var1<`k'- is interpreted by Stata as -if
var1[1] < `k'-.

Eva
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