
Dear list, 
  How can I calculate the difference in days between the eventdate and basedate in the below dataset? 
  
     id basedate   outcome.3 eventdate     daydiff
1  1001 1999-09-28         2 1999-10-01    3
2  1002 1999-09-22         1           
3  1003 2000-01-19         1           
4  1004 2004-01-25         2 2004-02-03    9
5  1005 2005-08-11         1           
6  1006 2000-07-04         1 2001-05-29    
7  1007 2004-02-12         1 2004-11-18
8  1008 2006-01-18         2 2006-02-02
9  1009 2005-04-29         2 2005-06-14
10 1010 2006-03-17         2 2006-03-31
11 1011 2000-03-21         2 2000-03-28
12 1012 2004-07-12         1 2006-11-28
13 1013 2000-02-24         1           
14 1014 2003-04-17         1           
15 1015 2000-04-05         1         
  
Thanks for any help,
Tom

       
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