Problem Note 7143: Weights incorrectly applied when REPEATED statement is used
If you specify both the REPEATED and WEIGHT statements, the results of
the GEE estimation method are incorrect because the square roots of the
weights are used in computing the working correlation matrix, rather
than the weights themselves. However, since the default empirical
covariance estimator is robust to misspecificiation of the correlation
matrix, the results are asymptotically correct.
A Technical Support hot fix for Release 8.2 TSLEVEL TS2M0 for this
issue is available at:
http://www.sas.com/techsup/download/hotfix/82_sbcs_prod_list.html#007143
Operating System and Release Information
| SAS System | SAS/STAT | Microsoft Windows 95/98 | 8 TS M0 | |
| Microsoft Windows NT Workstation | 8 TS M0 | 9 TS M0 |
| Microsoft Windows XP Professional | 8.2 TS2M0 | 9 TS M0 |
| Windows Millennium Edition (Me) | 8.2 TS2M0 | |
| Microsoft Windows 2000 Datacenter Server | 8 TS M0 | 9 TS M0 |
| Microsoft Windows 2000 Professional | 8 TS M0 | 9 TS M0 |
| Microsoft Windows 2000 Server | 8 TS M0 | 9 TS M0 |
| Solaris | 8 TS M0 | |
| OpenVMS VAX | 8 TS M0 | |
| Microsoft Windows 2000 Advanced Server | 8 TS M0 | 9 TS M0 |
| IRIX | 8 TS M0 | |
| 64-bit Enabled Solaris | 8 TS M0 | |
| Linux | 8.2 TS2M0 | 9 TS M0 |
| z/OS | 8 TS M0 | 9 TS M0 |
| OS/2 | 8 TS M0 | |
| ABI+ for Intel Architecture | 8.2 TS2M0 | |
| OpenVMS Alpha | 8 TS M0 | 9 TS M0 |
| HP-UX | 8 TS M0 | |
| 64-bit Enabled HP-UX | 8 TS M0 | |
| CMS | 8 TS M0 | |
| 64-bit Enabled AIX | 8 TS M0 | |
| AIX | 8 TS M0 | |
| Tru64 UNIX | 8 TS M0 | 9 TS M0 |
*
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.
| Type: | Problem Note |
| Priority: | alert |
| Topic: | Analytics ==> Bayesian Analysis
Analytics ==> Categorical Data Analysis
Analytics ==> Longitudinal Analysis
SAS Reference ==> Procedures ==> GENMOD
Analytics ==> Regression
Analytics ==> Analysis of Variance
|
| Date Modified: | 2002-05-01 15:13:40 |
| Date Created: | 2002-03-20 10:33:17 |
