Hello! I am working with a claims dataset across multiple years, which includes an enrollment file. There is one binary variable indicating enrollment in a certain plan (ENROLLFLAG), with multiple rows per person per record each year. In an ideal scenario, these multiple records correspond to all 12 months. However, some individuals may only have some of the months available, so the data is not set up from 1-12 rows for each person. There is a start and end date (STARTDATE, ENDDATE) associated with each record. How can I generate a dummy variable corresponding to the month associated with each record (FLAGMONTHLY) so that I am able to create a long dataset in this way: ENROLID ENROLLFLAG STARTDATE ENDDATE FLAGMONTHLY 1234 1 March 1 2011 March 31 2011 3 1234 1 April 1 2011 April 30 2011 4 1234 1 May 1 2011 May 31 2011 5 1234 1 June 1 2011 June 30 2011 6 1234 1 July 1 2011 July 31 2011 7 1234 1 August 1 2011 August 31 2011 8 1234 1 Sep 1 2011 Sep 30 2011 9 1234 1 Oct 1 2011 Oct 31 2011 10 1234 1 Nov 1 2011 Nov 30 2011 11 1234 1 Dec 1 2011 Dec 31 2011 12 1235 1 Jan 1 2011 Jan 31 2011 1 1235 1 Feb 1 2011 Feb 30 2011 2 1235 1 March 1 2011 March 31 2011 3 1235 1 April 1 2011 April 30 2011 4 1235 1 May 1 2011 May 31 2011 5 1235 1 June 1 2011 June 30 2011 6 1235 1 July 1 2011 July 31 2011 7 1235 1 August 1 2011 August 31 2011 8 1235 1 Sep 1 2011 Sep 30 2011 9 1235 1 Oct 1 2011 Oct 31 2011 10 1235 1 Nov 1 2011 Nov 30 2011 11 1235 1 Dec 1 2011 Dec 31 2011 12 Thank you very much!!
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