Problem Note 59054: The IRT procedure might fail to converge or it might produce an unreasonable estimate for the guessing parameter when RESFUNC=THREEP
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If you specify the RESFUNC=THREEP option in the PROC IRT statement or in the MODEL statement, the procedure might report an estimate of zero for the guessing parameter or it might issue the following message in the log:
WARNING: The estimation algorithm did not converge.
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 | SAS Release | |
| Reported | Fixed* | |||
| SAS System | SAS/STAT | Microsoft Windows NT Workstation | ||
| z/OS | 9.4 TS1M5 | |||
| z/OS 64-bit | 9.4 TS1M5 | |||
| OpenVMS VAX | 9.4 TS1M5 | |||
| Microsoft® Windows® for 64-Bit Itanium-based Systems | ||||
| Microsoft Windows Server 2003 Datacenter 64-bit Edition | ||||
| Microsoft Windows Server 2003 Enterprise 64-bit Edition | ||||
| Microsoft Windows XP 64-bit Edition | ||||
| Microsoft® Windows® for x64 | 9.4 TS1M5 | |||
| OS/2 | ||||
| Microsoft Windows 8 Enterprise 32-bit | 9.4 TS1M5 | |||
| Microsoft Windows 8 Enterprise x64 | 9.4 TS1M5 | |||
| Microsoft Windows 8 Pro 32-bit | 9.4 TS1M5 | |||
| Microsoft Windows 8 Pro x64 | 9.4 TS1M5 | |||
| Microsoft Windows 8.1 Enterprise 32-bit | 9.4 TS1M5 | |||
| Microsoft Windows 8.1 Enterprise x64 | 9.4 TS1M5 | |||
| Microsoft Windows 8.1 Pro 32-bit | 9.4 TS1M5 | |||
| Microsoft Windows 8.1 Pro x64 | 9.4 TS1M5 | |||
| Microsoft Windows 10 | 9.4 TS1M5 | |||
| Microsoft Windows 95/98 | ||||
| Microsoft Windows 2000 Advanced Server | ||||
| Microsoft Windows 2000 Datacenter Server | ||||
| Microsoft Windows 2000 Server | ||||
| Microsoft Windows 2000 Professional | ||||
| Microsoft Windows Server 2003 Datacenter Edition | ||||
| Microsoft Windows Server 2003 Enterprise Edition | ||||
| Microsoft Windows Server 2003 Standard Edition | ||||
| Microsoft Windows Server 2003 for x64 | ||||
| Microsoft Windows Server 2008 | ||||
| Microsoft Windows Server 2008 R2 | ||||
| Microsoft Windows Server 2008 for x64 | ||||
| Microsoft Windows Server 2012 Datacenter | 9.4 TS1M5 | |||
| Microsoft Windows Server 2012 R2 Datacenter | 9.4 TS1M5 | |||
| Microsoft Windows Server 2012 R2 Std | 9.4 TS1M5 | |||
| Microsoft Windows Server 2012 Std | 9.4 TS1M5 | |||
| Microsoft Windows XP Professional | ||||
| Windows 7 Enterprise 32 bit | 9.4 TS1M5 | |||
| Windows 7 Enterprise x64 | 9.4 TS1M5 | |||
| Windows 7 Home Premium 32 bit | 9.4 TS1M5 | |||
| Windows 7 Home Premium x64 | 9.4 TS1M5 | |||
| Windows 7 Professional 32 bit | 9.4 TS1M5 | |||
| Windows 7 Professional x64 | 9.4 TS1M5 | |||
| Windows 7 Ultimate 32 bit | 9.4 TS1M5 | |||
| Windows 7 Ultimate x64 | 9.4 TS1M5 | |||
| Windows Millennium Edition (Me) | ||||
| Windows Vista | ||||
| Windows Vista for x64 | ||||
| 64-bit Enabled AIX | 9.4 TS1M5 | |||
| 64-bit Enabled HP-UX | 9.4 TS1M5 | |||
| 64-bit Enabled Solaris | 9.4 TS1M5 | |||
| ABI+ for Intel Architecture | 9.4 TS1M5 | |||
| AIX | 9.4 TS1M5 | |||
| HP-UX | 9.4 TS1M5 | |||
| HP-UX IPF | 9.4 TS1M5 | |||
| IRIX | 9.4 TS1M5 | |||
| Linux | 9.4 TS1M5 | |||
| Linux for x64 | 9.4 TS1M5 | |||
| Linux on Itanium | 9.4 TS1M5 | |||
| OpenVMS Alpha | 9.4 TS1M5 | |||
| OpenVMS on HP Integrity | 9.4 TS1M5 | |||
| Solaris | 9.4 TS1M5 | |||
| Solaris for x64 | 9.4 TS1M5 | |||
| Tru64 UNIX | 9.4 TS1M5 | |||
A fix for this issue for SAS/STAT 14.1 is available at:
https://tshf.sas.com/techsup/download/hotfix/HF2/V34.html#59054
If you specify a three-parameter model in PROC IRT, the default estimation method might not converge or the guessing parameter might be zero.
| Type: | Problem Note |
| Priority: | alert |
| Topic: | Analytics ==> Psychometrics Analytics ==> analytics SAS Reference ==> Procedures ==> IRT |
| Date Modified: | 2017-07-13 12:37:46 |
| Date Created: | 2016-09-29 15:33:23 |