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Re: st: Recode non-integers to positive integers


From   Frank Gallo <fjgallo@mac.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Recode non-integers to positive integers
Date   Mon, 24 Aug 2009 06:21:45 -0400

Hi Tirthankar,

Yes. Thank you very much.

Best,
Frank


On Aug 24, 2009, at 6:16 AM, Tirthankar Chakravarty wrote:

Frank,

I am sure you know this, but just to make sure, the line

recode newvar (18=0)

was specific to the "auto" dataset, and I included it because the
variable "mpg" had no zeros which I could use to illustrate the
solution.

T

On Mon, Aug 24, 2009 at 10:59 AM, Frank Gallo<fjgallo@mac.com> wrote:
Hi Nick & Tirthankar,

Thank you for the suggestions. Here is what I did, which solved my problem:

egen newvar = group(oldvar)
recode newvar (18=0)
replace newvar = newvar - 1


Best,
Frank


On Aug 23, 2009, at 12:05 PM, Nick Cox wrote:

Alternatively,

egen newvar = group(oldvar) if oldvar != 0
replace newvar = 0 if newvar == .

This exploits the fact the -egen, group()- never yields 0 as a result.

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

Tirthankar Chakravarty

Well, in your case (non-negative values) it is easy. Simply subtract 1
from the -group-ed variable:
*******************
sysuse auto, clear
tab mpg
recode mpg (18=0) // change 18 to 0
egen new = group(mpg)
replace new = new - 1
tab new
*******************

On Sat, Aug 22, 2009 at 4:24 PM, Frank Gallo<fjgallo@mac.com> wrote:

So the syntax "egen newvar = group(oldvar)" achieves my goal for one
variable. But for another variable, I have "0" values that I want to keep and do not include in the grouping. I tried adding the if qualifier [egen
newvar = group(oldvar) if oldvar > 0] but this transformed the 0s to
missing. I would greatly appreciate any suggestions. Thank you.

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