SAS Note V6-MIXED-G977

From: SAS Technical Support (LISTSERV@VM.SAS.COM)
Date: Tue Jun 19 2001 - 07:57:17 EDT

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    V6-MIXED-G977 ***Alert Note***

    PROC MIXED Produces Incorrect Satterthwaite DF in Certain Situations

    Product: STAT
    Component: MIXED
    Priority: HIGH

      PROC MIXED will produce incorrect Satterthwaite or KR degrees of freedom
      when TYPE=FA0(2) is specified on the RANDOM statement and the G matrix
      is singular. PROC MIXED will produce a message in the log indicating
      that the G matrix is nonpositive definite in this case, but there is no
      indication that the degrees of freedom for the model are incorrect.

      There is no circumvention for this problem.

    Keywords:
      proc mixed fa0(2) random satterthwaite kr ddfm= incorrect df degrees
      freedom incorrout incorrstat
      G977

    SAS Note Revised On: Fri, 15 Jun 2001

    System Release Reported Release Fixed

    AIX/6000 6.12 TS020
    HP-UX Operating Systems 6.12 TS020
    IBM OS/2 6.12 TS020
    Solaris 6.12 TS020
    OpenVMS Alpha 6.12 TS020
    Windows 3.11 6.12 TS020
    Windows NT 6.12 TS020
    Windows 95 6.12 TS020
    Compaq Tru64 Unix 6.12 TS040
    Macintosh 6.12 TS040
    AIX/6000 6.11 TS020
    HP-UX Operating Systems 6.11 TS020
    IBM OS/2 6.11 TS020
    Solaris 6.11 TS020
    Windows 3.11 6.11 TS020
    Intel ABI 6.11 TS040
    Silicon Graphics Unix 6.11 TS040
    Compaq Tru64 Unix 6.11 TS040
    Windows NT 6.11 TS040
    Windows 95 6.11 TS040
    VM/ESA (CMS) 6.09 TS450
    OS/390 (MVS) 6.09 TS450
    OpenVMS VAX 6.09 TS450

    No Fixes Available

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