https://communities.sas.com/t5/New-SAS-User/How-to-fix-ascending-sequence-error/m-p/902718#M40311 <P>I believe <A href="https://communities.sas.com/t5/Statistical-Procedures/The-data-set-WORK-CLSS-is-not-sorted-in-ascending-sequence-with/td-p/406885" target="_self">this forum discussion</A> should provide all the guidance you need.</P> Sun, 12 Nov 2023 20:02:31 GMT Patrick 2023-11-12T20:02:31Z https://communities.sas.com/t5/New-SAS-User/How-to-fix-ascending-sequence-error/m-p/902717#M40310 <P>Hi so I keep trying to do a first difference approach and end it with the code:</P><P>&nbsp;</P><P>proc panel Data=MM6 plots=none;<BR />&nbsp; &nbsp;ID Statefips Year;<BR />&nbsp; &nbsp;Model ND = treatment / FIXONE noint HCCME=2 Cluster;<BR />run;</P><P>&nbsp;</P><P>However I keep recieving this error:</P><P>&nbsp;</P><P>The data set WORK.MM6 is not sorted in ascending sequence with respect to the time series ID. The current time period has<BR />year=2009 and the previous time period has year=2009 in cross section statefips=1.</P><P>&nbsp;</P><P>How would I go about to fix this? Thanks for the help!</P> Sun, 12 Nov 2023 19:37:09 GMT https://communities.sas.com/t5/New-SAS-User/How-to-fix-ascending-sequence-error/m-p/902717#M40310 ccherrub 2023-11-12T19:37:09Z https://communities.sas.com/t5/New-SAS-User/How-to-fix-ascending-sequence-error/m-p/902718#M40311 <P>I believe <A href="https://communities.sas.com/t5/Statistical-Procedures/The-data-set-WORK-CLSS-is-not-sorted-in-ascending-sequence-with/td-p/406885" target="_self">this forum discussion</A> should provide all the guidance you need.</P> Sun, 12 Nov 2023 20:02:31 GMT https://communities.sas.com/t5/New-SAS-User/How-to-fix-ascending-sequence-error/m-p/902718#M40311 Patrick 2023-11-12T20:02:31Z