https://communities.sas.com/t5/Statistical-Procedures/Proc-Traj-1-group-model-error/m-p/882589#M43654 I believe I have seen a post in the past where runing with double byte character support (DBCS) solved an issue with proc traj. <BR />Can you try to run the same code in SAS 9.4 session with DBCS support?<BR /><BR /> Tue, 27 Jun 2023 09:29:20 GMT JosvanderVelden 2023-06-27T09:29:20Z https://communities.sas.com/t5/Statistical-Procedures/Proc-Traj-1-group-model-error/m-p/881807#M43625 <P>Hi,</P><P>&nbsp;</P><P>I am trying to estimate a one group model with quadratic trajectory controlling for time-varying and time-independent covariates, it is showing me an error which says "risk statement is only meaningful for model with groups &gt;1". Is there a way to include time invariant covariates in a 1 group model?&nbsp;</P><P>&nbsp;</P><P>Kindly advise.&nbsp;</P><P><span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="Swarnali_0-1687379931915.png" style="width: 400px;"><img src="https://communities.sas.com/t5/image/serverpage/image-id/85229iE11383D9713DDB12/image-size/medium?v=v2&amp;px=400" role="button" title="Swarnali_0-1687379931915.png" alt="Swarnali_0-1687379931915.png" /></span></P><P>&nbsp;</P> Wed, 21 Jun 2023 20:41:28 GMT https://communities.sas.com/t5/Statistical-Procedures/Proc-Traj-1-group-model-error/m-p/881807#M43625 SG1993 2023-06-21T20:41:28Z https://communities.sas.com/t5/Statistical-Procedures/Proc-Traj-1-group-model-error/m-p/882589#M43654 I believe I have seen a post in the past where runing with double byte character support (DBCS) solved an issue with proc traj. <BR />Can you try to run the same code in SAS 9.4 session with DBCS support?<BR /><BR /> Tue, 27 Jun 2023 09:29:20 GMT https://communities.sas.com/t5/Statistical-Procedures/Proc-Traj-1-group-model-error/m-p/882589#M43654 JosvanderVelden 2023-06-27T09:29:20Z