PROC MIXED procedure crashes when I use influence option and by statement at the same time. Below are my SAS code and error message in the log. Any idea? Thanks, proc sort data=blood; by OrderName ObservationName; run; proc mixed data=blood; class subjectID Diet; model value = Diet / influence(iter=5 estimates) ; random SubjectID; by OrderName ObservationName; estimate 'trt effect' diet 1 -1; quit; Error message in log NOTE: Convergence criteria met. NOTE: The above message was for the following BY group: OrderName=C-Peptide ObservationName=C-Peptide, Serum ERROR: File WORK.UTRAW.UTILITY is damaged. ERROR: Utility file I/O. ERROR: File WORK.UTRAW.UTILITY is damaged. NOTE: PROCEDURE MIXED used (Total process time): real time 1.18 seconds cpu time 0.39 seconds
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