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st: 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   st: Carry over information on time-invariant covariate to all observations of a household?
Date   Tue, 3 Aug 2010 10:28:30 +0200

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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