PROC MIXED might produce incorrect results when the following conditions are met:

• You specify the DDFM=KR, DDFM=KR2, or DDFM=SAT option in the MODEL statement.
• You specify the TYPE=FA(q), TYPE=FA0(q), or TYPE=FA1(q) option in the RANDOM statement when t=1 regardless of the q value (where t is the dimension of the G matrix).
• At least one of the following conditions is also met:
  • You specify the OUTP= option in the MODEL statement.
  • You specify the SOLUTION option in the RANDOM statement.
  • You specify a CONTRAST or ESTIMATE statement involving random effects.

Click the Hot Fix tab in this note to access the hot fix for this issue.

Operating System and Release Information

Viya on Linux: An update for this issue is available for SAS Viya 3.5. For instructions on how to access and apply software updates, see the Updating Your SAS Viya software section in the SAS Viya 3.5 for Linux Deployment Guide at

A fix for this issue for SAS/STAT 15.3 is available at:

A fix for this issue for SAS/STAT 15.2 is available at: