st: inserting new observations between two consecutive observations

[James Bernard <jamesstatalist@gmail.com>]

Hi all,

I was wondering if you know of any way for adding new observations
between two consecutive observations.

Firm           Year
--------         ----------
A               1990
A               1991
A               1992
B               1990
B                1991
B               1992
C                1990
C                 1991
C                  1992

I want to add years 1993 and 1994 to the year, so it has to be
replaced between A-1992 and B-1990.

I thought of -replace- command and using the loop (knowing that the
length for each panel is 3). but that would not work as it replaces
the observations. It does not insert.

Any idea?

Thanks,
James
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