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Re: st: AW: Carry over information on time-invariant covariate to all observations of a household?


From   Jen Zhen <jenzhen99@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: AW: Carry over information on time-invariant covariate to all observations of a household?
Date   Tue, 3 Aug 2010 11:02:14 +0200

Great, thanks!


On Tue, Aug 3, 2010 at 10:35 AM, Dr. Martin Weiss <martin.weiss1@gmx.de> wrote:
>
> <>
>
> Use
>
> *************
> bysort HH (X): replace X = X[1]
> *************
>
> then!
>
>
> HTH
> Martin
>
> -----Ursprüngliche Nachricht-----
> Von: owner-statalist@hsphsun2.harvard.edu
> [mailto:owner-statalist@hsphsun2.harvard.edu] Im Auftrag von Jen Zhen
> Gesendet: Dienstag, 3. August 2010 10:29
> An: statalist@hsphsun2.harvard.edu
> Betreff: st: Carry over information on time-invariant covariate to all
> observations of a household?
>
> Dear Listers,
>
> suppose I have a panel with dimensions Household and Year. I have the
> time-invariant household characteristic X. Information on it is
> currently given for each household in only one of the years, but I
> would like to carry over this information to all observations of each
> household.
>
> To illustrate, the dataset looks like this:
>
> HH   Year    X
> 1     1990     5
> 1     1991     .
> 1     1992     .
> 2     1990     .
> 2     1991     3
> 2     1992     .
> 3     1990     .
> 3     1991     .
> 3     1992     2
>
> and I would like to fill in the missing values.
>
> Currently my way of doing it is this:
> - bysort HH: egen X2 = max(X) -
> - replace X = X2 -
>
> However, in a large dataset running this command takes forever, so I
> am wondering whether there is a faster way to do this?
>
> Many thanks,
> JZ
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