Dear all
I've got mysefl stuck on this little problem. My data is in the following form:
regno lboyear exityear X....
1 1992 2003
1 2000 .
1 1992 1996
1 1996 2000
2 2000 2003
2 1993 2000
3 1997 .
3 1993 1997
4 2000 .
5 1999 2002
I would like to:
1. Keep the earliest lboyear and the X variables associated with this earliest lboyear
2. Keep the latest exit year. Note that . indicates no exit, so I would want to keep the dot and not the latest year. I think this is handy as Stata stores it as +infinity.
Any advice is much appreciated.
Kevin
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