Problem Note 69853: The CAUSALMED procedure reports incorrect p-values for Poisson models
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When you specify the DIST=POISSON option in the MODEL statement, PROC CAUSALMED reports an incorrect p-value for each of the following mean ratios in the Summary of Effects table:
- Mean Ratio Total Effect
- Mean Ratio Controlled Direct Effect (CDE)
- Mean Ratio Natural Direct Effect (NDE)
- Mean Ratio Natural Indirect (NIE)
The reported p-values are associated with the test that the mean ratio is equal to zero rather than equal to one.
The confidence intervals are correct and should be used instead of the tests. There is no workaround for getting the proper test of H0: Mean Ratio=1.
A hot fix for is planned this issue.
Operating System and Release Information
| Product Family | Product | System | Product Release | SAS Release | ||
| Reported | Fixed* | Reported | Fixed* | |||
| SAS System | SAS/STAT | Microsoft® Windows® for x64 | 14.3 | 9.4 TS1M5 | ||
| Microsoft Windows 8 Enterprise 32-bit | 14.3 | 9.4 TS1M5 | ||||
| Microsoft Windows 8 Enterprise x64 | 14.3 | 9.4 TS1M5 | ||||
| Microsoft Windows 8 Pro 32-bit | 14.3 | 9.4 TS1M5 | ||||
| Microsoft Windows 8 Pro x64 | 14.3 | 9.4 TS1M5 | ||||
| Microsoft Windows 8.1 Enterprise 32-bit | 14.3 | 9.4 TS1M5 | ||||
| Microsoft Windows 8.1 Enterprise x64 | 14.3 | 9.4 TS1M5 | ||||
| Microsoft Windows 8.1 Pro 32-bit | 14.3 | 9.4 TS1M5 | ||||
| Microsoft Windows 8.1 Pro x64 | 14.3 | 9.4 TS1M5 | ||||
| Microsoft Windows 10 | 14.3 | 9.4 TS1M5 | ||||
| Microsoft Windows Server 2008 | 14.3 | 9.4 TS1M5 | ||||
| Microsoft Windows Server 2008 R2 | 14.3 | 9.4 TS1M5 | ||||
| Microsoft Windows Server 2008 for x64 | 14.3 | 9.4 TS1M5 | ||||
| Microsoft Windows Server 2012 Datacenter | 14.3 | 9.4 TS1M5 | ||||
| Microsoft Windows Server 2012 R2 Datacenter | 14.3 | 9.4 TS1M5 | ||||
| Microsoft Windows Server 2012 R2 Std | 14.3 | 9.4 TS1M5 | ||||
| Microsoft Windows Server 2012 Std | 14.3 | 9.4 TS1M5 | ||||
| Microsoft Windows Server 2016 | 14.3 | 9.4 TS1M5 | ||||
| Windows 7 Enterprise 32 bit | 14.3 | 9.4 TS1M5 | ||||
| Windows 7 Enterprise x64 | 14.3 | 9.4 TS1M5 | ||||
| Windows 7 Home Premium 32 bit | 14.3 | 9.4 TS1M5 | ||||
| Windows 7 Home Premium x64 | 14.3 | 9.4 TS1M5 | ||||
| Windows 7 Professional 32 bit | 14.3 | 9.4 TS1M5 | ||||
| Windows 7 Professional x64 | 14.3 | 9.4 TS1M5 | ||||
| Windows 7 Ultimate 32 bit | 14.3 | 9.4 TS1M5 | ||||
| Windows 7 Ultimate x64 | 14.3 | 9.4 TS1M5 | ||||
| 64-bit Enabled AIX | 14.3 | 9.4 TS1M5 | ||||
| 64-bit Enabled Solaris | 14.3 | 9.4 TS1M5 | ||||
| HP-UX IPF | 14.3 | 9.4 TS1M5 | ||||
| Linux for x64 | 14.3 | 9.4 TS1M5 | ||||
| Solaris for x64 | 14.3 | 9.4 TS1M5 | ||||
| z/OS 64-bit | 14.3 | 9.4 TS1M5 | ||||
| z/OS | 14.3 | 9.4 TS1M5 | ||||
A fix for this issue for SAS/STAT 15.3 is available at:
https://tshf.sas.com/techsup/download/hotfix/HF2/L9L.html#69853A fix for this issue for SAS/STAT 15.2 is available at:
https://tshf.sas.com/techsup/download/hotfix/HF2/I5J.html#69853
PROC CAUSALMED reports the p-value for testing the mean ratio equal to 0 instead of testing the mean ratio equal to 1.
| Type: | Problem Note |
| Priority: | alert |
| Topic: | Analytics ==> Categorical Data Analysis SAS Reference ==> Procedures ==> CAUSALMED |
| Date Modified: | 2023-02-09 12:30:52 |
| Date Created: | 2023-02-08 09:48:08 |