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RE: st: modifications to egen to handle multiple variables


From   Pradipto Banerjee <pradipto.banerjee@adainvestments.com>
To   "statalist@hsphsun2.harvard.edu" <statalist@hsphsun2.harvard.edu>
Subject   RE: st: modifications to egen to handle multiple variables
Date   Wed, 25 Jul 2012 13:40:23 -0500

Nick,

I am exploring write the codes more elegantly. I have around 40-45 codes, each having 3-4 instances of the code snippet I mentioned below; in total perhaps around 150. In each instance, to write a loop, I have to write 2-4 lines to define a varlist, e.g. in the snippet below, I may have to define a varlist of {varx1 varx2 varx3}, a varlist of {varb1 varb2 varb3}), etc., and then one line for "foreach ... {", one line for the -egen- part, one line for "}" and so on. Further, the "myfunc" in the code snippet below varies. In total, perhaps 4-6 lines per snippet in the case of a loop. So, I am looking for a solution where I can reduce it to 1 line - and make the codes look more elegant (most of the codes have 100-200 lines).


-----Original Message-----
From: owner-statalist@hsphsun2.harvard.edu [mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Nick Cox
Sent: Wednesday, July 25, 2012 12:38 PM
To: statalist@hsphsun2.harvard.edu
Subject: Re: st: modifications to egen to handle multiple variables

My suggestion (again) is that you would gain essentially nothing over
using loops to call -egen- multiple times, something that can be done
without pain.

Nick

On 25 Jul 2012, at 16:58, Pradipto Banerjee <pradipto.banerjee@adainvestments.com
 > wrote:

> I'm interested to define a new "generic" version of egen, called
> egenmult that can, if used as, for instance:
>
> . bysort var1 var2: egenmult {varx1 varx2 varx3} = myfunc(vara
> {varb1 varb2 varb3}), myoptions({vary1 vary2 vary3} varz)
>
> then Stata can interpret/replace the items within the "{" and "}"
> above as:
>
> . bysort var1 var2: egen varx1 = myfunc(vara varb1), myoptions(vary1
> varz)
>
> . bysort var1 var2: egen varx2 = myfunc(vara varb2), myoptions(vary2
> varz)
>
> . bysort var1 var2: egen varx3 = myfunc(vara varb3), myoptions(vary3
> varz)
>
>
> This question is related to my earlier post: http://www.stata.com/statalist/archive/2012-07/msg00732.html
>  . I had checked the source code for -rowsort-, -rowranks-, as was
> suggested in the response, but to my understanding, I would need to
> write a new program for every function where I want a multiple
> variable return feature.
>
> On the other hand, there is an extensive list of functions already
> available for -egen- / -egenmore-, and it might be just nice to have
> an -egenmult- program described above that can handle any "generic"
> functions already available for -egen-.
>
> Would it be possible to offer suggestions on how to achieve the
> above, i.e. how can one program the above
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