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

From   Nick Cox <[email protected]>
To   [email protected]
Subject   Re: st: RE: Re: label (automatically)
Date   Thu, 25 Sep 2008 16:38:01 -0500

That's a good case. I'll work it up for SSC in due course.

Thanks, Nick

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

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)

. 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

1. generate temp1 = log(day)

-----Original Message-----
From: [email protected]
[mailto:[email protected]] On Behalf Of Nick Cox

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)-?

[email protected]

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' "`*'"

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'

mygen lprice = log(price)
mygen gpm = 1/mpg

Kit Baum, Boston College Economics and DIW Berlin
An Introduction to Modern Econometrics Using Stata:

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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