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Re: st: How do i substitute the return local of program in the if expression of the egen command?


From   A Loumiotis <antonis.loumiotis@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: How do i substitute the return local of program in the if expression of the egen command?
Date   Tue, 30 Mar 2010 13:27:20 +0300

Thanks for your help!

using `r(andpve)' resolves the first problem...

but for !('r(andpve)') i get the following

invalid syntax
r(198);

any ideas?

Best,
Antonis

On Tue, Mar 30, 2010 at 12:57 PM, Maarten buis <maartenbuis@yahoo.co.uk> wrote:
> --- On Tue, 30/3/10, A Loumiotis wrote:
>> I have written a program (with the name andpve) that
>> generates an expression of the form:
>>
>> var1>=0 & var2>=0 & ... & varN>=0
>>
>> and returns this value as a local with name r(andpve).
>>
>> I then want to use r(andpve) in another progam (rowctotal)
>> where U substitute it in the if expression of the egen command.
>>
>> egen `left'_a = rowtotal(`right') if r(andpve), missing
>> egen `left'_b = rowmin(`right') if !(r(andpve))
>
> egen `left'_a = rowtotal(`right') if `r(andpve)', missing
> egen `left'_b = rowmin(`right') if !(`r(andpve)')
>
> Hope this helps,
> Maarten
>
> --------------------------
> Maarten L. Buis
> Institut fuer Soziologie
> Universitaet Tuebingen
> Wilhelmstrasse 36
> 72074 Tuebingen
> Germany
>
> http://www.maartenbuis.nl
> --------------------------
>
>
>
>>
>> But the egen command does not seem understand the r(andpve)
>> as an if
>> expression or the !(r(andpve)) as an if expression.
>>
>> What did I do wrong?  I'm new to Stata.  The code is
>> below.
>>
>> Best regards,
>>
>> Antonis Loumiotis
>> Athens, Greece
>>
>>
>> ------------------------------
>> ---------
>> program rowctotal, rclass
>>     version 11
>> gettoken left right: 0
>> capture drop `left'
>> andpve `right'
>>     di r(andpve)
>>     egen `left'_a = rowtotal(`right') if r(andpve),
>> missing
>>     egen `left'_b = rowmin(`right') if !(r(andpve))
>>     egen `left' = rowtotal(`left'_*), missing
>>     *drop `left'_*
>> end
>>
>> program andpve, rclass
>>     local k = 1
>>     while "``k''" != "" {
>>     local ++k
>>     }
>> local --k
>> local i = 1
>> local andpve ""
>> while `i' <= `k'-1 {
>>     local andpve "`andpve'``i''>=0 & "
>>     local ++i
>> }
>> local andpve "`andpve'``i''>=0"
>> return local andpve `andpve'
>> end
>>
>> -----------------------------------------------------------
>>
>> *
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>>
>
>
>
>
> *
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