data have;
infile cards ;
input ID first_Date last_Date ;
cards;
001 1/1/2004 1/5/2004
001 1/5/2004 1/10/2004
003 1/1/2005 4/5/2009
004 4/4/2010 4/5/2010
004 4/5/2010 4/15/2010
;
Hi everyone, I have the above data, I am trying to merge any intervals when the last date for that id equals the first date of a subsequent interval. For example for id number 1: I want the start date to be 1/1/2004 and the last date to be a/10/2004. Same for id number 4.
output data
001 1/1/2004 1/10/2004
003 1/1/2005 4/5/2009
004 4/4/2010 4/15/2010
;
That is complicated . There too many scenario you need to consider.
data have;
infile cards ;
input ID (first_Date last_Date) (: mmddyy10.) ;
cards;
001 1/1/2004 1/5/2004
001 1/5/2004 1/10/2004
003 1/1/2005 4/5/2009
004 4/4/2010 4/5/2010
004 4/5/2010 4/15/2010
;
data temp;
set have;
do date=first_date to last_date;
output;
end;
drop first_date last_date;
run;
proc sort data=temp out=temp1 nodupkey;
by id date;
run;
data temp2;
set temp1;
by id;
if first.id or dif(date) ne 1 then group+1;
run;
data want;
do until(last.group);
set temp2;
by group;
if first.group then first_date=date;
if last.group then last_date=date;
end;
format first_date last_date mmddyy10.;
drop group date;
run;
Does it always happen that the first_date of one record is always equal to the last_date for the previous record, within an ID? Or can there be cases where this is not true, for example:
001 1/1/2004 1/5/2004 001 1/6/2004 1/10/2004
Hi PaigeMiller, yes plenty. But in that case, I want to keep them as-is and only merge the one where the last date equals the first date of a subsequent record within the same ID.
Hi @lillymaginta1 Please post a more comprehensive/representative sample of your HAVE and WANT that covers all your scenarios. Explain your requirements for those. That would help in providing a solution in one shot.
That is complicated . There too many scenario you need to consider.
data have;
infile cards ;
input ID (first_Date last_Date) (: mmddyy10.) ;
cards;
001 1/1/2004 1/5/2004
001 1/5/2004 1/10/2004
003 1/1/2005 4/5/2009
004 4/4/2010 4/5/2010
004 4/5/2010 4/15/2010
;
data temp;
set have;
do date=first_date to last_date;
output;
end;
drop first_date last_date;
run;
proc sort data=temp out=temp1 nodupkey;
by id date;
run;
data temp2;
set temp1;
by id;
if first.id or dif(date) ne 1 then group+1;
run;
data want;
do until(last.group);
set temp2;
by group;
if first.group then first_date=date;
if last.group then last_date=date;
end;
format first_date last_date mmddyy10.;
drop group date;
run;
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