https://communities.sas.com/t5/New-SAS-User/PROC-Mixed-WARNING-Stopped-because-of-infinite-likelihood/m-p/534591#M6347 <PRE><CODE class=" language-sas">proc mixed data=DIS.THEFINAL noclprint; class provfs year wave georegion ARF_code; model srrexp = YEAR pctratio georegion ARF_code RNRatio TOTSTAS certdate cream hemom hgm mefavfm nephunkmissm nm / solution ddfm=kr; repeated wave / subject=provfs type=ar(1); lsmeans year georegion ARF_code/ adjust=tukey; run;</CODE></PRE><P>I'm working with healthcare facility longitudinal data (2013-2016) to predict readmission performance considering a host of variables (captured above in the model statement).&nbsp;</P><P>&nbsp;</P><P>I've run this model a number of times working my way backwards to significant p-values among variables. After several removals I got this error in the log "<SPAN> WARNING: Stopped because of infinite likelihood". I've read various Q&amp;A's on this forum trying to identify how to move forward and overcome this problem but nothing seems to provide a clear direction of what to do next. It's not duplicate data because that is intended with the structure of this model (facilities with 4 data points over time). Thoughts?</SPAN></P> Mon, 11 Feb 2019 19:38:15 GMT paulusab 2019-02-11T19:38:15Z https://communities.sas.com/t5/New-SAS-User/PROC-Mixed-WARNING-Stopped-because-of-infinite-likelihood/m-p/534591#M6347 <PRE><CODE class=" language-sas">proc mixed data=DIS.THEFINAL noclprint; class provfs year wave georegion ARF_code; model srrexp = YEAR pctratio georegion ARF_code RNRatio TOTSTAS certdate cream hemom hgm mefavfm nephunkmissm nm / solution ddfm=kr; repeated wave / subject=provfs type=ar(1); lsmeans year georegion ARF_code/ adjust=tukey; run;</CODE></PRE><P>I'm working with healthcare facility longitudinal data (2013-2016) to predict readmission performance considering a host of variables (captured above in the model statement).&nbsp;</P><P>&nbsp;</P><P>I've run this model a number of times working my way backwards to significant p-values among variables. After several removals I got this error in the log "<SPAN> WARNING: Stopped because of infinite likelihood". I've read various Q&amp;A's on this forum trying to identify how to move forward and overcome this problem but nothing seems to provide a clear direction of what to do next. It's not duplicate data because that is intended with the structure of this model (facilities with 4 data points over time). Thoughts?</SPAN></P> Mon, 11 Feb 2019 19:38:15 GMT https://communities.sas.com/t5/New-SAS-User/PROC-Mixed-WARNING-Stopped-because-of-infinite-likelihood/m-p/534591#M6347 paulusab 2019-02-11T19:38:15Z https://communities.sas.com/t5/New-SAS-User/PROC-Mixed-WARNING-Stopped-because-of-infinite-likelihood/m-p/534593#M6348 How many observations do you have? Mon, 11 Feb 2019 19:40:29 GMT https://communities.sas.com/t5/New-SAS-User/PROC-Mixed-WARNING-Stopped-because-of-infinite-likelihood/m-p/534593#M6348 Reeza 2019-02-11T19:40:29Z https://communities.sas.com/t5/New-SAS-User/PROC-Mixed-WARNING-Stopped-because-of-infinite-likelihood/m-p/534598#M6349 <P>21,676</P> Mon, 11 Feb 2019 19:52:14 GMT https://communities.sas.com/t5/New-SAS-User/PROC-Mixed-WARNING-Stopped-because-of-infinite-likelihood/m-p/534598#M6349 paulusab 2019-02-11T19:52:14Z