<>
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: [email protected]
[mailto:[email protected]] Im Auftrag von Ronnie
Babigumira
Gesendet: Dienstag, 14. April 2009 09:36
An: [email protected]
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: [email protected]
> [mailto:[email protected]] Im Auftrag von Ronnie
> Babigumira
> Gesendet: Dienstag, 14. April 2009 08:00
> An: [email protected]
> 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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