In SAS 9.2 TS1M0, the results on the ODS Graphics survival plot from the ATRISK= option are incorrect when there are multiple (tied) censored observations at a particular time where no event observations occur.

In this situation, the number at risk is incorrectly reported at the tied censored times where no event observations occur.

There is no circumvention for this problem.

Operating System and Release Information

Product Family	Product	System	SAS Release
			Reported	Fixed*
SAS System	SAS/STAT	z/OS	9.2 TS1M0	9.2 TS2M0
		Microsoft® Windows® for 64-Bit Itanium-based Systems	9.2 TS1M0	9.2 TS2M0
		Microsoft Windows Server 2003 Datacenter 64-bit Edition	9.2 TS1M0	9.2 TS2M0
		Microsoft Windows Server 2003 Enterprise 64-bit Edition	9.2 TS1M0	9.2 TS2M0
		Microsoft Windows XP 64-bit Edition	9.2 TS1M0	9.2 TS2M0
		Microsoft® Windows® for x64	9.2 TS1M0	9.2 TS2M0
		Microsoft Windows Server 2003 Datacenter Edition	9.2 TS1M0	9.2 TS2M0
		Microsoft Windows Server 2003 Enterprise Edition	9.2 TS1M0	9.2 TS2M0
		Microsoft Windows Server 2003 Standard Edition	9.2 TS1M0	9.2 TS2M0
		Microsoft Windows XP Professional	9.2 TS1M0	9.2 TS2M0
		Windows Vista	9.2 TS1M0	9.2 TS2M0
		Windows Vista for x64	9.2 TS1M0	9.2 TS2M0
		64-bit Enabled AIX	9.2 TS1M0	9.2 TS2M0
		64-bit Enabled HP-UX	9.2 TS1M0	9.2 TS2M0
		64-bit Enabled Solaris	9.2 TS1M0	9.2 TS2M0
		HP-UX IPF	9.2 TS1M0	9.2 TS2M0
		Linux	9.2 TS1M0	9.2 TS2M0
		Linux for x64	9.2 TS1M0	9.2 TS2M0
		OpenVMS on HP Integrity	9.2 TS1M0	9.2 TS2M0
		Solaris for x64	9.2 TS1M0	9.2 TS2M0

* 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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There is a problem with the results of the ATRISK= option in SAS9.2 TS1M0 under certain conditions.

Type:	Problem Note
Priority:	alert
Topic:	Analytics ==> Survival Analysis

Date Modified:	2010-10-04 13:11:47
Date Created:	2010-09-20 16:23:09