Problem Note 66370: The GLMSELECT procedure might display incorrect axis values in the model fit criteria plots when SELECTION=BACKWARD
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If the PLOTS=(CRITERIA) or PLOTS=(CRITERIONPANEL) option is specified in PROC GLMSELECT with SELECTION=BACKWARD, the Effect Sequence tick mark values in the Fit Criteria Plot might indicate incorrectly that terms are added to the model. The respective plots are correct. The following example illustrates the problem:
proc glmselect data=test plots=(CriterionPanel);
class c1 c2;
model y = x1 x2 x1*x1 x1*x2 x2*x2 c1|c2 / selection=backward(select=press);
run;
class c1 c2;
model y = x1 x2 x1*x1 x1*x2 x2*x2 c1|c2 / selection=backward(select=press);
run;
Since the backward elimination method is used, there should be a minus sign at every step to denote the removed term. The horizontal axis indicates "3 + c1" and "4 + c2" for the last two steps. The correct values are "3 - c1" and "4 - c2".
Click the Hot Fix tab in this note to access the hot fix for this issue.
Operating System and Release Information
| Product Family | Product | System | Product Release | SAS Release | ||
| Reported | Fixed* | Reported | Fixed* | |||
| SAS System | SAS/STAT | z/OS | 14.1 | 14.2 | 9.4 TS1M3 | 9.4 TS1M4 |
| z/OS 64-bit | 14.1 | 14.2 | 9.4 TS1M3 | 9.4 TS1M4 | ||
| Microsoft® Windows® for x64 | 14.1 | 14.2 | 9.4 TS1M3 | 9.4 TS1M4 | ||
| Microsoft Windows 8 Enterprise 32-bit | 14.1 | 14.2 | 9.4 TS1M3 | 9.4 TS1M4 | ||
| Microsoft Windows 8 Enterprise x64 | 14.1 | 14.2 | 9.4 TS1M3 | 9.4 TS1M4 | ||
| Microsoft Windows 8 Pro 32-bit | 14.1 | 14.2 | 9.4 TS1M3 | 9.4 TS1M4 | ||
| Microsoft Windows 8 Pro x64 | 14.1 | 14.2 | 9.4 TS1M3 | 9.4 TS1M4 | ||
| Microsoft Windows 8.1 Enterprise 32-bit | 14.1 | 14.2 | 9.4 TS1M3 | 9.4 TS1M4 | ||
| Microsoft Windows 8.1 Enterprise x64 | 14.1 | 14.2 | 9.4 TS1M3 | 9.4 TS1M4 | ||
| Microsoft Windows 8.1 Pro 32-bit | 14.1 | 14.2 | 9.4 TS1M3 | 9.4 TS1M4 | ||
| Microsoft Windows 8.1 Pro x64 | 14.1 | 14.2 | 9.4 TS1M3 | 9.4 TS1M4 | ||
| Microsoft Windows 10 | 14.1 | 14.2 | 9.4 TS1M3 | 9.4 TS1M4 | ||
| Microsoft Windows Server 2008 | 14.1 | 14.2 | 9.4 TS1M3 | 9.4 TS1M4 | ||
| Microsoft Windows Server 2008 R2 | 14.1 | 14.2 | 9.4 TS1M3 | 9.4 TS1M4 | ||
| Microsoft Windows Server 2008 for x64 | 14.1 | 14.2 | 9.4 TS1M3 | 9.4 TS1M4 | ||
| Microsoft Windows Server 2012 Datacenter | 14.1 | 14.2 | 9.4 TS1M3 | 9.4 TS1M4 | ||
| Microsoft Windows Server 2012 R2 Datacenter | 14.1 | 14.2 | 9.4 TS1M3 | 9.4 TS1M4 | ||
| Microsoft Windows Server 2012 R2 Std | 14.1 | 14.2 | 9.4 TS1M3 | 9.4 TS1M4 | ||
| Microsoft Windows Server 2012 Std | 14.1 | 14.2 | 9.4 TS1M3 | 9.4 TS1M4 | ||
| Windows 7 Enterprise 32 bit | 14.1 | 14.2 | 9.4 TS1M3 | 9.4 TS1M4 | ||
| Windows 7 Enterprise x64 | 14.1 | 14.2 | 9.4 TS1M3 | 9.4 TS1M4 | ||
| Windows 7 Home Premium 32 bit | 14.1 | 14.2 | 9.4 TS1M3 | 9.4 TS1M4 | ||
| Windows 7 Home Premium x64 | 14.1 | 14.2 | 9.4 TS1M3 | 9.4 TS1M4 | ||
| Windows 7 Professional 32 bit | 14.1 | 14.2 | 9.4 TS1M3 | 9.4 TS1M4 | ||
| Windows 7 Professional x64 | 14.1 | 14.2 | 9.4 TS1M3 | 9.4 TS1M4 | ||
| Windows 7 Ultimate 32 bit | 14.1 | 14.2 | 9.4 TS1M3 | 9.4 TS1M4 | ||
| Windows 7 Ultimate x64 | 14.1 | 14.2 | 9.4 TS1M3 | 9.4 TS1M4 | ||
| 64-bit Enabled AIX | 14.1 | 14.2 | 9.4 TS1M3 | 9.4 TS1M4 | ||
| 64-bit Enabled Solaris | 14.1 | 14.2 | 9.4 TS1M3 | 9.4 TS1M4 | ||
| HP-UX IPF | 14.1 | 14.2 | 9.4 TS1M3 | 9.4 TS1M4 | ||
| Linux for x64 | 14.1 | 14.2 | 9.4 TS1M3 | 9.4 TS1M4 | ||
| Solaris for x64 | 14.1 | 14.2 | 9.4 TS1M3 | 9.4 TS1M4 | ||
A fix for this issue for SAS/STAT 14.1 is available at:
https://tshf.sas.com/techsup/download/hotfix/HF2/V34.html#66370
When the backward elimination method is used in PROC GLMSELECT and PLOTS=(CRITERIA) is specified, the Effect Sequence axis might be incorrect.
| Type: | Problem Note |
| Priority: | high |
| Topic: | Analytics ==> Model Selection SAS Reference ==> Procedures ==> GLMSELECT |
| Date Modified: | 2021-12-02 11:05:53 |
| Date Created: | 2020-07-22 11:30:38 |