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fengyuwuzu
Pyrite | Level 9
data have;
    input id $ line startdate $10.;
datalines;
    A 1 2015-06-20
    A 2 2015-07-31
    A 3 2015-08-27
    B 1 2016-05-01
    B 2 2016-08-02
;
RUN;

 

what I want:

ID  line   startdate         enddate

A    1    2015-06-20    2015-07-30

A    2    2015-07-31    2015-08-26

A    3    2015-08-27    .

B    1    2016-05-01    2016-08-01

1 ACCEPTED SOLUTION

Accepted Solutions
PaigeMiller
Diamond | Level 26
data have;
    input id $ line startdate yymmdd10.;
	format startdate yymmdd10.;
datalines;
a 1 2015-06-20
a 2 2015-07-31
a 3 2015-08-27    
b 1 2016-05-01    
b 2 2016-08-02
;
run;

proc sql;
	create table want as select h.*,j.startdate-1 as enddate format=yymmdd10.
		from have as h left join have as j
		on h.id=j.id and h.line=j.line-1;
quit;
--
Paige Miller

View solution in original post

3 REPLIES 3
PaigeMiller
Diamond | Level 26
data have;
    input id $ line startdate yymmdd10.;
	format startdate yymmdd10.;
datalines;
a 1 2015-06-20
a 2 2015-07-31
a 3 2015-08-27    
b 1 2016-05-01    
b 2 2016-08-02
;
run;

proc sql;
	create table want as select h.*,j.startdate-1 as enddate format=yymmdd10.
		from have as h left join have as j
		on h.id=j.id and h.line=j.line-1;
quit;
--
Paige Miller
Tom
Super User Tom
Super User

First thing is to define your date variable to have dates and not character strings.

You can use this trick using an extra SET with FIRSTOBS=2 to create a "look ahead" or "lead" value for start date.

 

Take care that when you are on the last observation for a group that you not try to use the date from the first observation of the next group by using BY variable processing.

data have;
  input id $ line startdate :yymmdd10.;
  format startdate yymmdd10.;
datalines;
A 1 2015-06-20
A 2 2015-07-31
A 3 2015-08-27
B 1 2016-05-01
B 2 2016-08-02
;

data want ;
  set have ;
  by id;
  set have(firstobs=2 keep=startdate rename=(startdate=enddate)) have(drop=_all_ obs=1);
  if last.id then call missing(enddate);
  if not missing(enddate) then enddate=enddate-1;
run;
Obs    id    line     startdate       enddate

 1     A       1     2015-06-20    2015-07-30
 2     A       2     2015-07-31    2015-08-26
 3     A       3     2015-08-27             .
 4     B       1     2016-05-01    2016-08-01
 5     B       2     2016-08-02             .

 

fengyuwuzu
Pyrite | Level 9

Thank you Tom and Paige!

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