Problem Note 37728: Stratified trend tests in PROC LIFETEST may be incorrect for Peto, Modified Peto and Fleming tests
Some stratified trend test in results in PROC LIFETEST might be in error unless the data is sorted by the GROUP= variable on the STRATA statement. Example syntax for the STRATA statement to invoke the affected Peto, Modified Peto and Fleming tests is:
strata m / group=k tests=(Peto ModPeto Fleming) trend;
No other stratified trend tests are affected by this problem.
A work around is to sort the input data by the GROUP= variable first before calling PROC LIFETEST.
Operating System and Release Information
| SAS System | SAS/STAT | Microsoft Windows 2000 Advanced Server | 9.1 TS1M0 | |
| Microsoft Windows 2000 Datacenter Server | 9.1 TS1M0 | |
| Microsoft Windows 2000 Server | 9.1 TS1M0 | |
| Microsoft Windows 2000 Professional | 9.1 TS1M0 | |
| Microsoft Windows NT Workstation | 9.1 TS1M0 | |
| Microsoft Windows Server 2003 Datacenter Edition | 9.1 TS1M0 | 9.2 TS2M3 |
| Microsoft Windows Server 2003 Enterprise Edition | 9.1 TS1M0 | 9.2 TS2M3 |
| Microsoft Windows Server 2003 Standard Edition | 9.1 TS1M0 | 9.2 TS2M3 |
| Tru64 UNIX | 9.1 TS1M0 | 9.2 TS2M3 |
| OpenVMS Alpha | 9.1 TS1M0 | 9.2 TS2M3 |
| Linux | 9.1 TS1M0 | 9.2 TS2M3 |
| HP-UX IPF | 9.1 TS1M0 | 9.2 TS2M3 |
| 64-bit Enabled Solaris | 9.1 TS1M0 | 9.2 TS2M3 |
| 64-bit Enabled HP-UX | 9.1 TS1M0 | 9.2 TS2M3 |
| 64-bit Enabled AIX | 9.1 TS1M0 | 9.2 TS2M3 |
| Microsoft Windows XP Professional | 9.1 TS1M0 | 9.2 TS2M3 |
| Microsoft Windows Server 2003 Enterprise 64-bit Edition | 9.1 TS1M0 | 9.2 TS2M3 |
| Microsoft Windows Server 2003 Datacenter 64-bit Edition | 9.1 TS1M0 | 9.2 TS2M3 |
| Microsoft® Windows® for 64-Bit Itanium-based Systems | 9.1 TS1M0 | 9.2 TS2M3 |
| z/OS | 9.1 TS1M0 | 9.2 TS2M3 |
*
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.
Stratified trend tests may be incorrect for the Peto, ModPeto and Fleming tests unless the data are sorted by the GROUP= variable.
| Type: | Problem Note |
| Priority: | alert |
| Topic: | Analytics ==> Survival Analysis
SAS Reference ==> Procedures ==> LIFETEST
|
| Date Modified: | 2010-09-16 15:07:24 |
| Date Created: | 2009-11-04 18:49:09 |
