https://communities.sas.com/t5/SAS-Programming/how-to-create-a-copy-of-first-observation-of-each-subject-in-sas/m-p/288121#M59363 <P>Thats just controlling the output statement:</P> <PRE>data want; /* assumes sorted!! */ set have; by subject; if first.subject then do; output; output; end; else output; run;</PRE> <P>The above will output two rows if first.subject. &nbsp;Note needs to be sorted by subject and then the rows in the order you want.</P> Fri, 29 Jul 2016 13:58:13 GMT RW9 2016-07-29T13:58:13Z https://communities.sas.com/t5/SAS-Programming/how-to-create-a-copy-of-first-observation-of-each-subject-in-sas/m-p/288117#M59362 <P>I have a dataset with 10 observations per subject. I want to create &nbsp;a copy of the first observation &nbsp;so that &nbsp;new datset will contain 11 observations per subject.</P><P>&nbsp;</P><P>Thanks</P> Fri, 29 Jul 2016 13:54:34 GMT https://communities.sas.com/t5/SAS-Programming/how-to-create-a-copy-of-first-observation-of-each-subject-in-sas/m-p/288117#M59362 ari 2016-07-29T13:54:34Z https://communities.sas.com/t5/SAS-Programming/how-to-create-a-copy-of-first-observation-of-each-subject-in-sas/m-p/288121#M59363 <P>Thats just controlling the output statement:</P> <PRE>data want; /* assumes sorted!! */ set have; by subject; if first.subject then do; output; output; end; else output; run;</PRE> <P>The above will output two rows if first.subject. &nbsp;Note needs to be sorted by subject and then the rows in the order you want.</P> Fri, 29 Jul 2016 13:58:13 GMT https://communities.sas.com/t5/SAS-Programming/how-to-create-a-copy-of-first-observation-of-each-subject-in-sas/m-p/288121#M59363 RW9 2016-07-29T13:58:13Z