Oh, I see.. It's really a trick^^ but works perfect.
Thanks,
Martin
======= 2008-05-15 17:23:28 Original Message：=======
>
>Fixing thread index by reposting:
>
>>Hi Roy Wada,
>>
>>I see this solution, but not so sure how does the following two lines work:
>> outreg using myfiles, `append'
>> local append "append"
>>
>>Can anyone please explain a little? In the first line, without previous definition
>> of append, what's their initial value? what if in the first loop I want to use
>>"replace" option, and in the following I want to use "Append"?
>>
>>Thanks,
>>
>>Martin
>
>It's an old trick that makes a clever use of macros. See Nick
>Cox's explanation here:
>
>http://www.stata.com/statalist/archive/2004-06/msg00238.html
>
>When the loop runs the first time, `append' takes null value, meaning
>empty space. -outreg- sees nothing. During the subsequent loops,
>it will see "append".
>
>If it makes it easier for you, then the example can be adjusted the
>following way by adding -local append "replace"-
>
>* the relevant part
>local append "replace"
>foreach var in `r(levels)' {
> xi: areg price mpg turn i.rep if year==`var', absorb(id)
> outreg using myfiles, `append'
> local append "append">
>}
>
>In fact, this is how values are passed between subroutines within
>-outreg-.
>
>Roy
>
>
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