Problem Note 48111: PROC SURVEYMEANS may produce incorrect variance estimates with poststratification
When poststratification is done in PROC SURVEYMEANS using the POSTSTRATA statement, the following conditions can produce incorrect variance estimates and related statistics:
- the default VARMETHOD=TAYLOR method is used, a CLUSTER statement is not specified, and with or without a STRATA statement specified
- the default VARMETHOD=TAYLOR method is used, a DOMAIN statement is specified and a categorical analysis variable is specified on the VAR statement
- a replication method is specified with VARMETHOD=BRR or VARMETHOD=JK and the REPWEIGHTS statement is specified
- a replication method is specified with VARMETHOD=BRR or VARMETHOD=JK and a RATIO statement is specified
- a categorical analysis variable that has one or more missing values is specified on the VAR statement
The following is a list of statistics keywords that might be affected and the corresponding column label in the output:
Click the Hot Fix tab in this note to access Hot Fix I41003 which provides corrections for all of these problems.
Operating System and Release Information
| SAS System | SAS/STAT | z/OS | 12.1 | 12.3 | 9.3 TS1M2 | 9.4 TS1M0 |
| Microsoft® Windows® for x64 | 12.1 | 12.3 | 9.3 TS1M2 | 9.4 TS1M0 |
| Microsoft Windows Server 2003 Datacenter Edition | 12.1 | | 9.3 TS1M2 | |
| Microsoft Windows Server 2003 Enterprise Edition | 12.1 | | 9.3 TS1M2 | |
| Microsoft Windows Server 2003 Standard Edition | 12.1 | | 9.3 TS1M2 | |
| Microsoft Windows Server 2003 for x64 | 12.1 | | 9.3 TS1M2 | |
| Microsoft Windows Server 2008 | 12.1 | | 9.3 TS1M2 | |
| Microsoft Windows Server 2008 for x64 | 12.1 | 12.3 | 9.3 TS1M2 | 9.4 TS1M0 |
| Microsoft Windows XP Professional | 12.1 | | 9.3 TS1M2 | |
| Windows 7 Enterprise 32 bit | 12.1 | | 9.3 TS1M2 | |
| Windows 7 Enterprise x64 | 12.1 | 12.3 | 9.3 TS1M2 | 9.4 TS1M0 |
| Windows 7 Home Premium 32 bit | 12.1 | | 9.3 TS1M2 | |
| Windows 7 Home Premium x64 | 12.1 | | 9.3 TS1M2 | |
| Windows 7 Professional 32 bit | 12.1 | | 9.3 TS1M2 | |
| Windows 7 Professional x64 | 12.1 | 12.3 | 9.3 TS1M2 | 9.4 TS1M0 |
| Windows 7 Ultimate 32 bit | 12.1 | | 9.3 TS1M2 | |
| Windows 7 Ultimate x64 | 12.1 | | 9.3 TS1M2 | |
| Windows Vista | 12.1 | | 9.3 TS1M2 | |
| Windows Vista for x64 | 12.1 | | 9.3 TS1M2 | |
| 64-bit Enabled AIX | 12.1 | 12.3 | 9.3 TS1M2 | 9.4 TS1M0 |
| 64-bit Enabled HP-UX | 12.1 | 12.3 | 9.3 TS1M2 | 9.4 TS1M0 |
| 64-bit Enabled Solaris | 12.1 | 12.3 | 9.3 TS1M2 | 9.4 TS1M0 |
| HP-UX IPF | 12.1 | 12.3 | 9.3 TS1M2 | 9.4 TS1M0 |
| Linux | 12.1 | 12.3 | 9.3 TS1M2 | 9.4 TS1M0 |
| Linux for x64 | 12.1 | 12.3 | 9.3 TS1M2 | 9.4 TS1M0 |
| Solaris for x64 | 12.1 | 12.3 | 9.3 TS1M2 | 9.4 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.
The variance estimates and related statistics are wrong in most cases when the POSTSTRATA statement is specified in PROC SURVEYMEANS. A Hot Fix addresses this issue.
| Type: | Problem Note |
| Priority: | alert |
| Topic: | SAS Reference ==> Procedures ==> SURVEYMEANS
|
| Date Modified: | 2013-06-17 17:48:47 |
| Date Created: | 2012-10-09 15:57:06 |
