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AW: st: AW: Problem looping over spells for an individual


From   "Martin Weiss" <martin.weiss1@gmx.de>
To   <statalist@hsphsun2.harvard.edu>
Subject   AW: st: AW: Problem looping over spells for an individual
Date   Wed, 25 Feb 2009 17:59:23 +0100

<> 

Well, the "__000000" thing is the internal name for the temp you created. I
wanted to point out that this compares the FIRST observation and its "touse"
value. If the first value of "touse" is one, then this statement is true,
otherwise false. Maybe that is what you want, maybe not...


*************
sysuse auto, clear

if mpg>20{
	di in red "MPG bigger than 20"
}

if mpg>25{
	di in red "MPG bigger than 25"
}

list mpg in 1
*************



HTH
Martin


-----Ursprüngliche Nachricht-----
Von: owner-statalist@hsphsun2.harvard.edu
[mailto:owner-statalist@hsphsun2.harvard.edu] Im Auftrag von Ilona Carneiro
Gesendet: Mittwoch, 25. Februar 2009 17:51
An: statalist@hsphsun2.harvard.edu
Betreff: Re: st: AW: Problem looping over spells for an individual

HI Martin

I tried checking this before, but I didn't know how to interpret it.

With tr: byid I get:
  if __000000 {

But I don't know what that means?

Ilona

On 25 Feb 2009, at 17:39, Martin Weiss wrote:

>
> <>
>
> Are you sure the line
>
> *************
> if `touse' {
> *************
>
> does what you want it to? -set trace on- or indeed use the recently
> announced -ssc d tr-  and report what happens...
>
>
> HTH
> Martin
>
>
> -----Ursprüngliche Nachricht-----
> Von: owner-statalist@hsphsun2.harvard.edu
> [mailto:owner-statalist@hsphsun2.harvard.edu] Im Auftrag von Ilona  
> Carneiro
> Gesendet: Mittwoch, 25. Februar 2009 17:24
> An: statalist@hsphsun2.harvard.edu
> Betreff: st: Problem looping over spells for an individual
>
> Hello all
>
> I am trying to write a programme that will run a command sequentially
> for observations of an individual. For each individual I have multiple
> spells and multiple failures. However, the twist is that I also need
> to exclude a period of time at risk after each treatment (prophylaxis)
> and after each failure (to prevent double-counting of failures that
> may actually be the same episode). I managed to do this without any
> problem for the treatment, but if an episode is disqualified (by a
> prior treatment or episode) I don't want it to disqualify a subsequent
> episode. Therefore I need to run the code sequentially for each spell
> of an individual, but using the marksample touse code to run it "by"
> individual doesn't seem to be working - the "forvalues" seems to
> always interpret _N as the last observation in the whole dataset, not
> the last observation for each individual.
>
> I have the following code:
>
> 		program define byid, byable(recall, noheader)
> 		marksample touse
> 		sort `id' `start'
> 		if `touse' {
> 		forvalues i = 1(1)`=_N' {
> 		replace lagend = (`end' + `lag') if ((`tx' > 0 & `tx' < .) |
> (`case'
>> 0 & `case' < .))
> 		drop if lagend[`i'-1]>`end' & `id'[`i'-1]==`id'
> 		}
> 		}
> 		end
> 		
> 		gen lagend=. 	
> 		qui by id: byid
>
> but I get the error:
> 2nd by group not found
> r(111);
>
> And the programme isn't doing what I need it to.
>
> Any ideas?
>
> Ilona
>
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