https://communities.sas.com/t5/SAS-Programming/Comparing-two-observations/m-p/72828#M15685 Hi, <BR /> <BR /> I don't know how to compare two rows for a same variable. For instance, if I have<BR /> <BR /> obs1 56<BR /> obs2 57<BR /> <BR /> I wanna check if 57-56 = 1. <BR /> <BR /> Thanks. Thu, 05 Feb 2009 17:29:06 GMT deleted_user 2009-02-05T17:29:06Z https://communities.sas.com/t5/SAS-Programming/Comparing-two-observations/m-p/72828#M15685 Hi, <BR /> <BR /> I don't know how to compare two rows for a same variable. For instance, if I have<BR /> <BR /> obs1 56<BR /> obs2 57<BR /> <BR /> I wanna check if 57-56 = 1. <BR /> <BR /> Thanks. Thu, 05 Feb 2009 17:29:06 GMT https://communities.sas.com/t5/SAS-Programming/Comparing-two-observations/m-p/72828#M15685 deleted_user 2009-02-05T17:29:06Z https://communities.sas.com/t5/SAS-Programming/Comparing-two-observations/m-p/72829#M15686 Try <BR /> if x-lag(x) = 1 Thu, 05 Feb 2009 17:46:57 GMT https://communities.sas.com/t5/SAS-Programming/Comparing-two-observations/m-p/72829#M15686 Flip 2009-02-05T17:46:57Z https://communities.sas.com/t5/SAS-Programming/Comparing-two-observations/m-p/72830#M15687 thank you, it works <span class="lia-unicode-emoji" title=":slightly_smiling_face:">🙂</span> Tue, 10 Feb 2009 14:33:44 GMT https://communities.sas.com/t5/SAS-Programming/Comparing-two-observations/m-p/72830#M15687 deleted_user 2009-02-10T14:33:44Z