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how to refer to a previous value in longitudinal data set

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how to refer to a previous value in longitudinal data set

Hi all,

I am working with a longitudinal data; students received a degree at a certain time; I wonder how I can change all the values to 1 after degree attainment. For example, this is what my data looks like now:

Id     time     award

1       1           .

1        2          .

1       3           1

1       4           .

1        5           .

What I would like to do is to change the two missing values for time=5 and time=6 into 1. Any help is appreciated~!

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