SAS Institute Alert Note SN-008867

From: SAS Technical Support (tsdlist@unx.sas.com)
Date: Tue Jan 14 2003 - 07:21:35 EST

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    SN-008867 ***Alert Note***

    Incorrect sample with METHOD=PPS or METHOD=SAMPFORD and CERTSIZE

    Product: SAS/STAT
    Component: SURVEYSELECT procedure
    Priority: ALERT

      When any of the CERTSIZE options are used with METHOD=PPS or
      METHOD=SAMPFORD on the PROC SURVEYSELECT statement, if the number of
      certainty units equals the specified sample size in any stratum, then
      the resulting sample from that stratum will be incorrect. The output
      sample data set will contain the first N units of the stratum, where
      units are ordered by size for METHOD=PPS and are in input order for
      METHOD=SAMPFORD, instead of the N certainty units. The following log
      message is issued:

         NOTE: The number of certainty units equals the specified sample size.

      but there is no indication that the sample is wrong.

      There is no circumvention for this problem. The certainty units will
      have to be manually selected for strata where this occurs.

    Keywords:
      method pps sampford certsize certainty units equal equals sample size
      incorrout incorrstat wrong incorrect
      incorrect sample with method=pps or method=sampford and certsize
      008867 8867

    SAS Note Revised On: Wed, 8 Jan 2003

    System Version Reported Version Fixed

    AIX 64 bit 8.2 TS2M0 9.1 TS1M0
    AIX/6000 8 TSM0
    VM/ESA (CMS) 8 TSM0
    Compaq Tru64 UNIX 8 TSM0 9.1 TS1M0
    HP-UX Operating Systems 8 TSM0
    HP-UX Itanium 9 TSM0 9.1 TS1M0
    HP-UX 64 bit 8.2 TS2M0 9.1 TS1M0
    Intel ABI 8 TSM0
    Intel Itanium Processor Family(IPF) 9 TSM0 9.1 TS1M0
    Linux 8.2 TS2M0 9.1 TS1M0
    MIPS ABI 8 TSM0
    OS/390 (MVS) 8 TSM0 9.1 TS1M0
    IBM OS/2 8 TSM0
    Solaris 8 TSM0
    Solaris 64 bit 8.2 TS2M0 9.1 TS1M0
    OpenVMS VAX 8 TSM0
    OpenVMS Alpha 8 TSM0 9.1 TS1M0
    Windows NT 8 TSM0 9.1 TS1M0
    Windows 2000 Datacenter Server 8 TSM0 9.1 TS1M0
    Windows 2000 Professional 8 TSM0 9.1 TS1M0
    Windows 2000 Server and Advanced Server 8 TSM0 9.1 TS1M0
    Windows 95 8 TSM0
    Windows 98 8 TSM0
    Windows ME 8.2 TS2M0
    Windows XP 8.2 TS2M0 9.1 TS1M0

    No Fixes Available

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