Re: AW: st: AW: Quotes for scalar within local (was efficiently run three loops (or do without them))

[Ronnie Babigumira <rb.glists@gmail.com>]

True true, and Nick did propose something along those lines yesterday, however (and I may be wrong), 
having the `i''s and `j''s gives me more documentation options so I can produce something like this 
where product, unit, and price codes call come from these scalars

Potential error in the price for product 25 & unit 11
Average price is 777.7
  +------------------------------------------------+
  | houscode | qtr | fup_pdt | fup_unit | fup_unpx |
  |----------+-----+---------+----------+----------|
  |      407 |   2 |      25 |       11 |    15000 |
  +------------------------------------------------+

Anyway I think I can safely close this thread. As always, a great learning experience (and a 
reminder that I should give back more to this great community)

Thank you.

Ronnie

Martin Weiss wrote:
> <> 
>
> The line -g x = foreign == `i' & rep78 == `j'- smacks of 
>
> *************
> egen mygroups=group(for rep)
> *************
>
> as a more easily intelligible alternative...
>
>
> HTH
> Martin
>
>
> -----Ursprüngliche Nachricht-----
> Von: owner-statalist@hsphsun2.harvard.edu
> [mailto:owner-statalist@hsphsun2.harvard.edu] Im Auftrag von Ronnie
> Babigumira
> Gesendet: Dienstag, 14. April 2009 09:36
> An: statalist@hsphsun2.harvard.edu
> Betreff: Re: st: AW: Quotes for scalar within local (was efficiently run
> three loops (or do without them))
>
> Thanks Martin.
>
> That it is not a recommended strategy tells me I am doing something "wrong"
> or that I need to be
> careful. Might you know why it is not recommended.
>
> Also, I am thinking that this revised code is closer to what Roy wrote only
> I like to put this kind
> of stuff out of the the main body of the code so that I can easily change
> them (but I can live with
> this anyway)
>
> sysuse auto, clear
> levelsof foreign, local(source)
> foreach i of local source {
> 	levelsof rep78 if foreign == `i', local(rep)
> 		foreach j of local rep {
> 			g x = foreign == `i' & rep78 == `j'
> 			sum mpg if x
> 			drop x
> 			}
> }
>
> Martin Weiss wrote:
> > <> 
> >
> > If you wanted to make the -local- work here, you would have to delay
> > evaluation with the "\" character. This is not a recommended strategy, but
> > note the difference here:
> >
> > *************
> > sysuse auto, clear
> > local x "foreign == `i' & rep78 == `j'"
> > local y "foreign == \`i' & rep78 == \`j'"
> > macro dir
> > *************
> >
> >
> >
> > HTH
> > Martin
> >
> > -----Ursprüngliche Nachricht-----
> > Von: owner-statalist@hsphsun2.harvard.edu
> > [mailto:owner-statalist@hsphsun2.harvard.edu] Im Auftrag von Ronnie
> > Babigumira
> > Gesendet: Dienstag, 14. April 2009 08:00
> > An: statalist@hsphsun2.harvard.edu
> > Betreff: st: Quotes for scalar within local (was efficiently run three
> loops
> > (or do without them))
> >
> > Thanks
> > Exploring your suggestion but wanting to put the checks in a macro rather
> > than a variable, however,
> > I am stuck (I have checked the archives but I cannot find a solution)
> >
> > An illustration using the auto data
> >
> > local x "foreign == `i' & rep78 == `j'"
> > sysuse auto, clear
> > levelsof foreign, local(source)
> > foreach i of local source {
> > 	levelsof rep78 if foreign == `i', local(rep)
> > 		foreach j of local rep {
> > 			sum mpg if `x'
> > 			}
> > }	
> >
> > I have set the trace on and this is where it fails
> > - sum mpg if `x'
> > = sum mpg if foreign ==  & rep78 ==
> >
> > Looks like the `i' and `j' disappear. I have fiddled around with different
> > combinations of quotes
> > but no luck.
> >
> > Ronnie
> >
> >
> >
> > Roy Wada wrote:
> > > > gen check=1 if fup_pdt>`x' | fup_unit=`Y' | fup_qtycoll`x' &
> fup_unit=`Y'
> > & fup_qtycoll
> > > where x, y, z are some conditions to be met. Then you would list them,
> > i.e.
> > >  
> > > list fup_pdt fup_unit if check==1
> > >
> > > And you'll know they aren't good at all.
> > >  
> > > _________________________________________________________________
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