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st: Keep specific observation

From   Yun <>
To   "" <>
Subject   st: Keep specific observation
Date   Sat, 3 Sep 2011 00:12:44 +1000

I need help in stata command to drop/keep certain observations using stata 11.0

There are two column of different data. Fisrt column is A,B,C (unique ID). The second column has data 1,2,3.

Column 1 Column2
A                  1
A                  2
A                  3
B                  1
B                  2
C                  1
C                  2
C                  3
D                  1
D                  3

I need all the observations that satisfy this condition --> column 1 will have group of column 2 (1,2,3)--> for instance A & C.

I do not know the command for this.

Thank you.



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