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causecode
2010 Jul 13
1
Equivalent of SAS's FIRST. And LAST. Variable in R?
Hi all,
I'm just wondering if there is a equivalent of SAS's FIRST. and LAST.
variables in R?
For example, suppose this is a snapshot of the data:
ClientCode CaseCode open close Important
1 37 28 2003-07-08 2003-09-02 1
2 37 310 2003-11-01 2004-09-10 1
3 37 1562 2007-04-03 2007-07-27 1
4 38 29 2003-02-28 2007-09-05 1
5 38 599 2004-07-1...