Problem Note 35127: Equivalent Models Produce Different Results in PROC MIXED
PROC MIXED returns incorrect results when you have a RANDOM statement, and a REPEATED statement with no repeated effect specified, and any one of the following situations:
- the response variable has a missing value for the first observation for the 2nd subject and/or any subsequent subject, or
- WEIGHT statement and the WEIGHT variable has a missing value for the first observation for the 2nd subject and/or any subsequent subject, or
- INFLUENCE option in the MODEL statement.
The circumvention is to always specify the repeated effect in the REPEATED statement.
The problem has been fixed in SAS 9.2 TS2M2.
Operating System and Release Information
| SAS System | SAS/STAT | OpenVMS VAX | 8.2 TS2M0 | 9.2 TS2M2 |
| OS/2 | 8.2 TS2M0 | |
| Microsoft Windows 95/98 | 8.2 TS2M0 | |
| Microsoft Windows 2000 Advanced Server | 8.2 TS2M0 | |
| Microsoft Windows 2000 Datacenter Server | 8.2 TS2M0 | |
| Microsoft Windows 2000 Server | 8.2 TS2M0 | |
| Microsoft Windows 2000 Professional | 8.2 TS2M0 | |
| Windows Millennium Edition (Me) | 8.2 TS2M0 | |
| 64-bit Enabled AIX | 8.2 TS2M0 | 9.2 TS2M2 |
| 64-bit Enabled HP-UX | 8.2 TS2M0 | 9.2 TS2M2 |
| 64-bit Enabled Solaris | 8.2 TS2M0 | 9.2 TS2M2 |
| ABI+ for Intel Architecture | 8.2 TS2M0 | 9.2 TS2M2 |
| AIX | 8.2 TS2M0 | 9.2 TS2M2 |
| HP-UX | 8.2 TS2M0 | 9.2 TS2M2 |
| IRIX | 8.2 TS2M0 | 9.2 TS2M2 |
| Linux | 8.2 TS2M0 | 9.2 TS2M2 |
| OpenVMS Alpha | 8.2 TS2M0 | 9.2 TS2M2 |
| Solaris | 8.2 TS2M0 | 9.2 TS2M2 |
| Tru64 UNIX | 8.2 TS2M0 | 9.2 TS2M2 |
| Microsoft Windows NT Workstation | 8.2 TS2M0 | |
| Microsoft Windows Server 2003 Datacenter Edition | 8.2 TS2M0 | 9.2 TS2M2 |
| Microsoft Windows Server 2003 Enterprise Edition | 8.2 TS2M0 | 9.2 TS2M2 |
| Microsoft Windows Server 2003 Standard Edition | 8.2 TS2M0 | 9.2 TS2M2 |
| Microsoft Windows XP Professional | 8.2 TS2M0 | 9.2 TS2M2 |
| z/OS | 8.2 TS2M0 | 9.2 TS2M2 |
*
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.
PROC MIXED returns incorrect results when the model has a RANDOM statement, and a REPEATED statement with no repeated effect, and one of the following: missing values in certain position for the response variable or the WEIGHT variable, or you have the INFLUENCE option in the MODEL statement.
| Type: | Problem Note |
| Priority: | alert |
| Date Modified: | 2011-02-23 10:09:32 |
| Date Created: | 2009-03-13 11:06:02 |
