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Re: st: modifications to egen to handle multiple variables
From
Nick Cox <[email protected]>
To
"[email protected]" <[email protected]>
Subject
Re: st: modifications to egen to handle multiple variables
Date
Wed, 25 Jul 2012 20:54:35 +0100
Given that you want to do this, I'd recommend writing a parser that
writes loops that call -egen-. Don't try rewriting -egen-. That's my
take.
Nick
On 25 Jul 2012, at 19:40, Pradipto Banerjee <[email protected]
> wrote:
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: [email protected] [mailto:owner-
[email protected]] On Behalf Of Nick Cox
Sent: Wednesday, July 25, 2012 12:38 PM
To: [email protected]
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 <[email protected]
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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