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Problem Note 19432: Incorrect output possible with the GROUP= option on RANDOM statement

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If your PROC MIXED code contains a RANDOM statement and both of the following conditions are met:

  1. there are missing values in any of the CLASS variables or covariates used on the CLASS, MODEL, or RANDOM statements
  2. the RANDOM statement uses a GROUP= option with no SUBJECT= option on that statement

then the output from PROC MIXED might be incorrect. The above two conditions must hold for the output to be incorrect, but the two conditions above do not guarantee that the output will be wrong.

To circumvent the problem, either drop the observations with missing values in the predictor variables before running PROC MIXED or (if possible) rewrite your RANDOM statement so that it contains a SUBJECT= effect.

Missing values in the dependent variable on the MODEL statement do not trigger this problem. There must be missing values in the predictor variables for the problem to occur.

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



Operating System and Release Information

Product FamilyProductSystemSAS Release
ReportedFixed*
SAS SystemSAS/STATMicrosoft Windows XP Professional9.1 TS1M09.2 TS1M0
Microsoft Windows NT Workstation9.1 TS1M0
Microsoft® Windows® for 64-Bit Itanium-based Systems9.1 TS1M09.2 TS1M0
Microsoft Windows Server 2003 Standard Edition9.1 TS1M09.2 TS1M0
Microsoft Windows Server 2003 Enterprise Edition9.1 TS1M09.2 TS1M0
Microsoft Windows Server 2003 Datacenter Edition9.1 TS1M09.2 TS1M0
Microsoft Windows 2000 Professional9.1 TS1M0
Microsoft Windows 2000 Server9.1 TS1M0
Microsoft Windows 2000 Datacenter Server9.1 TS1M0
64-bit Enabled Solaris9.1 TS1M09.2 TS1M0
Solaris for x649.1 TS1M3 SP49.2 TS1M0
Microsoft Windows 2000 Advanced Server9.1 TS1M0
z/OS9.1 TS1M09.2 TS1M0
Linux9.1 TS1M09.2 TS1M0
Linux on Itanium9.1 TS1M39.2 TS1M0
HP-UX IPF9.1 TS1M09.2 TS1M0
64-bit Enabled HP-UX9.1 TS1M09.2 TS1M0
OpenVMS Alpha9.1 TS1M09.2 TS1M0
64-bit Enabled AIX9.1 TS1M09.2 TS1M0
Tru64 UNIX9.1 TS1M09.2 TS1M0
* For software releases that are not yet generally available, the Fixed Release is the software release in which the problem is planned to be fixed.