Re: st: Simulating time series with if else condition

[mweberru@students.mail.uni-mannheim.de]

Thank you very much for the replies, both answers were really helpful!
I replaced the whole part with the single line suggested by Ch. Baum  
and the results are just as desired.

Regards,
M. Weber




Zitat von Nick Cox <njcoxstata@gmail.com>:

> A separate issue is that
>
> if fyear == 1971 {
>
> }
>
> else if fyear > 1971 ...
>
> will always be interpreted as
>
> if fyear[1] == 1971 {
>
> }
> else if fyear[1] >= 1971 ...
>
> which is presumably not what is wanted. So the code not only can but
> also should be rewritten. See also
>
> FAQ     . . . . . . . . . . . . . . . . . . . . .  if command vs. if  
> qualifier
>         . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   
> J. Wernow
>         6/00    I have an if command in my program that only seems
>                 to evaluate the first observation, what's going on?
>                 http://www.stata.com/support/faqs/lang/ifqualifier.html
>
> Nick
>
> On Tue, Feb 21, 2012 at 11:09 PM, Christopher Baum <kit.baum@bc.edu> wrote:
> > <>
> > Untested, but I think you can replace
> >
> >
> > if fyear==1971{
> >     by id: replace debtlevel_sim=actual_debtlevel
> > /*start with actual debt-level in 1971*/
> >     }
> > else if fyear>1971 & (L.debtlevel_sim+debtissue_sim)<=0 {        /*in
> > years following 1971: no negative debt-level*/
> >     by id: replace debtlevel_sim=0
> >     }
> > else {
> >     by id: replace debtlevel_sim=L.debtlevel_sim+debtissue_sim
> >
> >
> > with one line:
> >
> >
> > by id: replace debtlevel_sim = cond( fyear==1971, actual_debtlevel,  
> > max(0, L.debtlevel_sim+debtissue_sim ))
>
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