I have an unbalanced panel data(cross-setion and
time-series) which looks like below:
ID year x1 x2
1 1993 .. ..
1 1994 .. ..
1 1995 .. ..
2 1995 .. ..
2 1996 .. ..
2 1997 .. ..
3 1993 .. ..
3 1994 .. ..
3 1995 .. ..
The data is about firms' survival analysis. The last
year of my sample is 2003. In the example above, firm
1 dies in 1996 because the last year of this firm
is 1995 and firm 2 dies in 1998, and so on. I want to
add a record at the end of each subject (firm)
indicating the year when the fird dies. Can anyone
tell me how to accomplish this? Thank you in advance.
Xiaoyi
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