st: How do I fill in missing values using last-observation-carried-fo rward (LOCF) in stata

[z-da@kellogg.northwestern.edu]

Is there an easy way of implementing the following task in STATA? (It
sounds a very easy task, but it goes beyond my limited knowledge of STATA.)

Say, I have a data series with two variables: date, dummy

date      dummy
1/1/03      1
1/2/03      .
1/3/03      3
1/4/03      .
1/5/03      .
1/7/03      2
1/8/03      .
1/9/03      .
1/10/03    .
1/11/03    4
1/12/03    .
1/13/03    .
.......

I just want to fill the missing value, using the previous value until it
changes (or the last-observation-carried-forward method), ie, to get

date      dummy
1/1/03      1
1/2/03      1
1/3/03      3
1/4/03      3
1/5/03      3
1/7/03      2
1/8/03      2
1/9/03      2
1/10/03    2
1/11/03    4
1/12/03    4
1/13/03    4
.......




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