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SUPPORT / SAMPLES & SAS NOTES
 

Support

Problem Note 42805: PROC MIXED incorrectly produces predicted values as 0 for certain situations

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PROC MIXED might produce incorrect predicted values as 0 for a new subject in the input dataset. The following must be true for this problem to occur:

  • There is a REPEATED statement with the SUBJECT= option, and
  • There is an OUTP= option on the MODEL statement, and
  • At least one subject has all missing repsonses and a new fixed effect class level that does not occur in another subject that has at least one non-missing response.

    • For example, suppose the data contains a treatment effect TRT. TRT has 2 levels observed in the input dataset, A and B. However, there exists at least one subject on which no dependent variable data was collected. The observations for the dependent variable on this subject have all missing values. This subject also has a new level of TRT, C. With a REPEATED statement and the OUTP= option on the model statement, then this and other subjects in the data that have all missing values for the dependent variable might have predictions set to 0 in the OUTP= dataset.

    To circumvent the problem, delete those observations that have both missng response and a new level of fixed effect.

    A hot fix is available for this issue. Click on the Hot Fix tab above to download the hot fix.



    Operating System and Release Information

    Product FamilyProductSystemProduct ReleaseSAS Release
    ReportedFixed*ReportedFixed*
    SAS SystemSAS/STATz/OS9.229.39.2 TS2M39.3 TS1M0
    Microsoft® Windows® for 64-Bit Itanium-based Systems9.229.39.2 TS2M39.3 TS1M0
    Microsoft Windows Server 2003 Datacenter 64-bit Edition9.229.39.2 TS2M39.3 TS1M0
    Microsoft Windows Server 2003 Enterprise 64-bit Edition9.229.39.2 TS2M39.3 TS1M0
    Microsoft Windows XP 64-bit Edition9.229.39.2 TS2M39.3 TS1M0
    Microsoft® Windows® for x649.229.39.2 TS2M39.3 TS1M0
    Microsoft Windows Server 2003 Datacenter Edition9.229.39.2 TS2M39.3 TS1M0
    Microsoft Windows Server 2003 Enterprise Edition9.229.39.2 TS2M39.3 TS1M0
    Microsoft Windows Server 2003 Standard Edition9.229.39.2 TS2M39.3 TS1M0
    Microsoft Windows Server 2003 for x649.229.39.2 TS2M39.3 TS1M0
    Microsoft Windows Server 20089.229.39.2 TS2M39.3 TS1M0
    Microsoft Windows Server 2008 for x649.229.39.2 TS2M39.3 TS1M0
    Microsoft Windows XP Professional9.229.39.2 TS2M39.3 TS1M0
    Windows 7 Enterprise 32 bit9.229.39.2 TS2M39.3 TS1M0
    Windows 7 Enterprise x649.229.39.2 TS2M39.3 TS1M0
    Windows 7 Home Premium 32 bit9.229.39.2 TS2M39.3 TS1M0
    Windows 7 Home Premium x649.229.39.2 TS2M39.3 TS1M0
    Windows 7 Professional 32 bit9.229.39.2 TS2M39.3 TS1M0
    Windows 7 Professional x649.229.39.2 TS2M39.3 TS1M0
    Windows 7 Ultimate 32 bit9.229.39.2 TS2M39.3 TS1M0
    Windows 7 Ultimate x649.229.39.2 TS2M39.3 TS1M0
    Windows Vista9.229.39.2 TS2M39.3 TS1M0
    Windows Vista for x649.229.39.2 TS2M39.3 TS1M0
    64-bit Enabled AIX9.229.39.2 TS2M39.3 TS1M0
    64-bit Enabled HP-UX9.229.39.2 TS2M39.3 TS1M0
    64-bit Enabled Solaris9.229.39.2 TS2M39.3 TS1M0
    HP-UX IPF9.229.39.2 TS2M39.3 TS1M0
    Linux9.229.39.2 TS2M39.3 TS1M0
    Linux for x649.229.39.2 TS2M39.3 TS1M0
    OpenVMS on HP Integrity9.229.39.2 TS2M39.3 TS1M0
    Solaris for x649.229.39.2 TS2M39.3 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.