PROC QUANTREG with the ALGORITH=INTERIOR option might produce a floating point zero divide error. The source of the error is that for the data at hand, the underlying linear program is very sensitive to small numerical perturbations and zero divide errors might occur at different quantiles on different hardware configurations.

The log file may show the following error messages and note:

ERROR: Floating Point Zero Divide.

ERROR: Termination due to Floating Point Exception

NOTE: The SAS System stopped processing this step because of errors.

A Hot Fix is available for this problem; see the Hot Fix tab.

Operating System and Release Information

Product Family	Product	System	SAS Release
			Reported	Fixed*
SAS System	SAS/STAT	z/OS	9.2 TS1M0	9.2 TS2M2
		Microsoft® Windows® for 64-Bit Itanium-based Systems	9.2 TS1M0	9.2 TS2M2
		Microsoft Windows Server 2003 Datacenter 64-bit Edition	9.2 TS1M0	9.2 TS2M2
		Microsoft Windows Server 2003 Enterprise 64-bit Edition	9.2 TS1M0	9.2 TS2M2
		Microsoft Windows XP 64-bit Edition	9.2 TS1M0	9.2 TS2M2
		Microsoft® Windows® for x64	9.2 TS1M0	9.2 TS2M2
		Microsoft Windows Server 2003 Datacenter Edition	9.2 TS1M0	9.2 TS2M2
		Microsoft Windows Server 2003 Enterprise Edition	9.2 TS1M0	9.2 TS2M2
		Microsoft Windows Server 2003 Standard Edition	9.2 TS1M0	9.2 TS2M2
		Microsoft Windows XP Professional	9.2 TS1M0	9.2 TS2M2
		Windows Vista	9.2 TS1M0	9.2 TS2M2
		64-bit Enabled AIX	9.2 TS1M0	9.2 TS2M2
		64-bit Enabled HP-UX	9.2 TS1M0	9.2 TS2M2
		64-bit Enabled Solaris	9.2 TS1M0	9.2 TS2M2
		HP-UX IPF	9.2 TS1M0	9.2 TS2M2
		Linux	9.2 TS1M0	9.2 TS2M2
		Linux for x64	9.2 TS1M0	9.2 TS2M2
		OpenVMS on HP Integrity	9.2 TS1M0	9.2 TS2M2
		Solaris for x64	9.2 TS1M0	9.2 TS2M2

* 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.

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A fix for SAS 9.2 (TS1M0) for this issue is available at:

http://www.sas.com/techsup/download/hotfix/f9_sbcs_prod_list.html#034523

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A fix for SAS 9.2 (TS1M0) with Asian Language Support (DBCS) for this issue is available at:

http://www.sas.com/techsup/download/hotfix/f9_dbcs_prod_list.html#034523

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This particular FPZD error has been found in SAS 9.2 but not in SAS 9.1.3. PROC QUANTREG is production in SAS 9.2 and experimental and available via web-download in SAS 9.1.3 (for stand-alone Windows installations only).

Type:	Problem Note
Priority:	high
Topic:	Analytics ==> Regression

Date Modified:	2009-02-03 16:31:27
Date Created:	2009-01-16 18:32:57