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timee
2011 Jul 28
1
Calculating difference in variable values (e.g. elapsed time) in data frame
Hello,
I have a data frame containing time (e.g. GMT), and I would like to
create/add a new variable that would be the computation of the elapsed
time since the first observation. Does anyone have a suggestion for an
easy way to do this? I am having trouble creating a new variable that
would contain just the first time observation (then I could take
difference between actual time and