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RE: st: RE: Re: label (automatically)


From   "Feiveson, Alan H. (JSC-SK311)" <alan.h.feiveson@nasa.gov>
To   <statalist@hsphsun2.harvard.edu>
Subject   RE: st: RE: Re: label (automatically)
Date   Thu, 25 Sep 2008 16:14:10 -0500

1. -defv- may let you (re)generate a variable, but putting the
definition in notes is a nuisance:
2. -defv- seems to require spaces

By contrast -labgen- puts the definition directly in the variable label
and doesn't require spaces - however -labgen won't allow regeneration.

Al F.


. drop temp*

. defv temp1 = log(day)

. defv temp2=log(day)
r(7);

. labgen temp3=log(day)

. des temp*

              storage  display     value
variable name   type   format      label      variable label
------------------------------------------------------------------------
---------------------------
temp1           float  %9.0g                * 
temp3           float  %9.0g                  log(day)

. notes temp1

temp1:
  1.  generate temp1 = log(day)

. 





-----Original Message-----
From: owner-statalist@hsphsun2.harvard.edu
[mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Nick Cox
Sent: Thursday, September 25, 2008 2:39 PM
To: statalist@hsphsun2.harvard.edu
Subject: Re: st: RE: Re: label (automatically)

I'd forgotten about this. Thanks for the plug.

I think this predates SSC. Either way, it is probably not on SSC because
I just posted it there and did not bother to write a help file. Stuff
like that never makes the grade to SSC and thus to -njc_stuff- on SSC.

Twelve years on, that's still my inclination.

A very good reason for that, as already pointed out, is that -defv-
already exists to do the job.

A key detail for Kit's program is that -gettoken- should parse on equals
signs as well.

Also, what happens if people write -mygen double lprice = log(price)-?

Nick
n.j.cox@durham.ac.uk

Feiveson, Alan H. (JSC-SK311) wrote:

>  Yes - Nick Cox wrote -labgen.ado- which does excactly that. FOr some 
> reason this is not on SSC. Perhaps Nick could make it avaliable.
> 
> *! version 1.0.1  7/17/1996
> program define labgen
> 	version 4.0
> 	parse "`*'", parse(" =")
> 	if "`2'"=="=" {
> 		local var `1'
> 		mac shift 2
> 	}
> 	else if "`3'"=="=" {
> 		local type `1'
> 		mac shift
> 		local var `1'
> 		mac shift 2
> 	}
> 	else { error 198 }
> 	gen `type' `var' = `*'
> 	label var `var' "`*'"
> end

Christopher

> Not to my knowledge.
> Probably the best way of documenting this is to use variable -notes-.

> Try this:
> 
> program mygen
> qui gen `0'
> gettoken name rest: 0
> note `name': `0'
> end
> 
> mygen lprice = log(price)
> mygen gpm = 1/mpg
> notes
> 
> 
> Kit Baum, Boston College Economics and DIW Berlin 
> http://ideas.repec.org/e/pba1.html
> An Introduction to Modern Econometrics Using Stata:
> http://www.stata-press.com/books/imeus.html
> 
> On Sep 25, 2008, at 1:47 PM, Alessandro Oliveira wrote:

> I wonder if you could help me with an Stata issue.
>> Is it possible for stata to automatically label a new variable with 
>> the formula used in "gen"? ex: gen y = x+1 automatically yielding 
>> label variable y with "gen y = x+1"

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