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Re: st: Re: Loop syntax


From   "Vladimir Vakhitov" <vvakhitov@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Re: Loop syntax
Date   Wed, 26 Mar 2008 14:10:47 -0400

Janet,

Talking just on a syntax matter, -then tcount==tcount+1- is incorrect.
If you need just a number at the end, announce a local first before
the loop and then increment this local within the loop:

local tcount=0
forvalues <...> {
  if <...> {
  local ++tcount
  }
}
di `tcount'

However, I think the other solutions proposed here are better, and I
just wanted to make a comment on the proper syntax of your command.

Vladimir.



2008/3/26, Janet Hill <janethill73@yahoo.co.uk>:
> I have some results on 236 patients and each patient has 57 recordings stored in a single variable t. I am trying to count how many of these patients have a score of t>0. I tried the following code:
>
>  gen tcount=0
>  forvalues i=1/236{
>     forvalues j=1/57{
>     if patient==`i' & t>0 {
>     then tcount==tcount+1
>     continue
>  }
>  }
>  }
>
>  but the value of tcount never changes from 0.
>
>  Could somebody please explain the correct syntax.
>  Thanks,
>  Janet
>
>
>
>
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__________________
Volodymyr Vakhitov
vvakhitov@gmail.com
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