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RE: st: modifying egen to add a replace feature


From   Pradipto Banerjee <pradipto.banerjee@adainvestments.com>
To   "statalist@hsphsun2.harvard.edu" <statalist@hsphsun2.harvard.edu>
Subject   RE: st: modifying egen to add a replace feature
Date   Thu, 19 Jul 2012 08:36:04 -0500

That's exactly the issue I had. I had tried to use -replace- as an option, but Stata threw a error message saying that the variable is already defined.

-----Original Message-----
From: owner-statalist@hsphsun2.harvard.edu [mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Nick Cox
Sent: Thursday, July 19, 2012 4:09 AM
To: statalist@hsphsun2.harvard.edu
Subject: Re: st: modifying egen to add a replace feature

Not so. Writing a new -egen- function so that it takes a -replace-
option is not the issue here. -egen- will throw out the call if -y- is
an existing variable before the function code is even entered. The
issue is cloning -egen- to do the replacement.

As I've signalled elsewhere, I think  it is easiest just to -drop-
what you don't want and/or do a -replace- afterwards.

Nick

On Thu, Jul 19, 2012 at 8:13 AM, Maarten Buis <maartenlbuis@gmail.com> wrote:
> On Wed, Jul 18, 2012 at 5:00 PM, Pradipto Banerjee wrote:
>> Is it possible to rewrite or modify egen, or create an ado file, such that I can simply write like this:
>>
>> bysort x: egen y = myfunc (y, a, b, ...), replace
>
> Yes, the logic behind the way -egen- works is that if you type -egen y
> = myfunc()-, -egen- will look for a file _gmyfunc.ado, which
> implements the function myfunc() and it also passes the option you
> have specified to that .ado file. So you can write your own -egen-
> functions. The easiest way to get started is to look at an existing
> similar function and addept that, e.g. look at -viewsource _gmean.ado.
>
>
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