DATA HAVE;
INPUT ID $ BEGINDT MMDDYY10. +1 ENDDT MMDDYY10. DRUG $;
FORMAT BEGINDT ENDDT MMDDYY10.;
CARDS;
1 01/01/2017 01/10/2017 A
1 02/15/2017 03/15/2017 A
1 04/01/2017 04/10/2017 B
1 05/01/2017 05/02/2017 A
1 06/01/2017 07/31/2017 B
1 06/15/2017 06/26/2017 C
1 07/01/2017 07/02/2017 A
1 07/19/2017 07/20/2017 D
1 08/01/2017 09/10/2017 A
2 05/02/2017 06/01/2017 B
2 06/10/2017 07/10/2017 B
2 06/10/2017 07/10/2017 B
2 08/16/2017 09/15/2017 C
3 11/11/2016 11/16/2016 A
3 11/12/2016 11/15/2016 A
3 11/12/2016 11/15/2016 B
3 11/15/2016 12/15/2016 C
3 12/02/2016 12/03/2016 D
;
RUN;
但是其中有些病人不会吃四种药,那么吃三种药也要被记录下来,作为次一级危险的信号。
希望有大拿可以帮我一下子,拜谢拜谢



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