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datediff
2011 Mar 21
3
Computing row differences in new columns
...sed on the previous row. Obviously the last entry for each subject should be a NA.
Which would be the best way to accomplished that ?
I guess questions like that have been already answered a thousand times, so I apologize for asking one more time.
Thanks
Roberto
SUBJECT
Date
Result
DateDiff
ResultDiff
10751
22-Jul-03
3.5
10751
13-Feb-04
1.3
10751
20-Aug-04
1.6
10751
08-Mar-05
1.7
10751
30-Aug-05
1.6
10751
21-Feb-06
1.3
10751
31-Aug-06
1.2
10751
27-Feb-07
1.5
10751
29-Aug-07
1
10752
29-Jul-03
5.9
10752
24-Feb-04
5
10752
25-Aug-04
3.6
10752
11-Mar-0...