Hi

b1 is month of birth and b2 is year of birth. I want to drop all the observations below March 2000.

How I can do that, please

Code:
* Example generated by -dataex-. To install: ssc install dataex
clear
input int DHSCLUST byte b1 int b2
1  3 1973
1  6 1974
1  4 1975
1  3 1978
1  6 1978
1 12 1979
1  1 1980
1  1 1981
1  3 1982
1  5 1982
1  6 1983
1  6 1984
1  4 1985
1  8 1986
1  9 1988
1  5 1992
1 12 1992
1  3 1993
1 11 1993
1  9 1994
1 10 1994
1  6 1995
1  6 1996
1  1 1999
1  2 2000
1  6 2000
1  9 2001
1  6 2004
1 11 2004
1  7 2005
1  9 2006
2  2 1988
2  2 1988
2 11 1988
2  7 1989
2 12 1989
2 11 1990
2 10 1991
2  7 1992
2 11 1992
2  4 1994
2  6 1994
2  2 1995
2  6 1996
2  9 1996
end