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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 21:01:15 -0400 |

Thank you. On Aug 24, 2009, at 12:10 PM, Nick Cox wrote: One advantage of using egen newvar = group(oldvar) if oldvar != 0 replace newvar = 0 if newvar == . is that it extends easily to assignment of value labels, e.g. egen newvar = group(oldvar) if oldvar != 0, label replace newvar = 0 if newvar == . The subtracting 1 route extends only messily to having labels as well. As sooner or later you are likely to want to see labelled output, this is a notable detail. Nick n.j.cox@durham.ac.uk Frank Gallo 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 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. 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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**References**:**Re: st: Recode non-integers to positive integers***From:*Mike Wazowski <mike.wazowski@ymail.com>

**Re: st: Recode non-integers to positive integers***From:*Frank Gallo <fjgallo@mac.com>

**Re: st: Recode non-integers to positive integers***From:*Frank Gallo <fjgallo@mac.com>

**Re: st: Recode non-integers to positive integers***From:*Tirthankar Chakravarty <tirthankar.chakravarty@gmail.com>

**RE: st: Recode non-integers to positive integers***From:*"Nick Cox" <n.j.cox@durham.ac.uk>

**Re: st: Recode non-integers to positive integers***From:*Frank Gallo <fjgallo@mac.com>

**RE: st: Recode non-integers to positive integers***From:*"Nick Cox" <n.j.cox@durham.ac.uk>

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