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2011 Apr 20
3
[test message] Can R replicate this data manipulation in SAS?
...specific periods of time and decides whether that constitutes HAART or not. To me, this is a pretty tricky data manipulation in SAS. Is there any way to get the equivalent result in R? Thanks, Paul **** SAS syntax for coding HAART in HIV patients; **** Read in test data; data haart; input id book_class $ start_date :mmddyy. stop_date :mmddyy.; format start_date stop_date mmddyy8.; cards; 1004 NRTI 07/24/95 01/05/99 1004 NRTI 11/20/95 12/10/95 1004 NRTI 01/10/96 01/05/99 1004 PI 05/09/96 11/16/97 1004 NRTI 06/01/96 02/01/97 1004 NRTI 07/01/96 03/01/97 9999 PI 01/02/03 . 9999 NNRTI 04/05...