Problem Note 19320: Subgroup means used to indicate out-of-control points with
CONTROLSTAT=MEDIAN
When the CONTROLSTAT=MEDIAN option is specified on a BOXCHART statement
in PROC SHEWHART, the OUTLABEL and COUT options will be applied to
subgroup means outside the control limits, whereas they should only be
applied to subgroup medians outside the control limits.
There is no direct circumvention for this problem. However, the
following approach may provide an alternative when incorrect OUTLABEL
results are observed. First specify an OUTTABLE= data set on the
BOXCHART statement. Then, in a DATA step, modify the output data set by
creating a new label variable for the observations where
EXLIM='LOWER' or 'UPPER'. If OUTLABEL=(variable) is specified in PROC
SHEWHART, then specify NewLabelVar=(variable) in the DATA step. If
OUTLABEL=VALUE is specified in PROC SHEWHART, then specify
NewLabelVar=_SUBMED_ . Finally, run PROC SHEWHART again using the option
ALLLABEL=NewLabelVar in place of the OUTLABEL= option. The correct
subgroups will now be labeled, although the labels will be placed at the
means and not the medians.
Operating System and Release Information
| SAS System | SAS/QC | Microsoft Windows NT Workstation | 8 TS M0 | |
| Microsoft Windows XP Professional | 8.2 TS2M0 | 9.2 TS1M0 |
| Microsoft Windows 95/98 | 8 TS M0 | |
| Microsoft Windows Server 2003 Standard Edition | 8.2 TS2M0 | 9.2 TS1M0 |
| Microsoft® Windows® for 64-Bit Itanium-based Systems | 9 TS M0 | 9.2 TS1M0 |
| Windows Millennium Edition (Me) | 8.2 TS2M0 | |
| Microsoft Windows Server 2003 Datacenter Edition | 8.2 TS2M0 | 9.2 TS1M0 |
| Microsoft Windows Server 2003 Enterprise Edition | 8.2 TS2M0 | 9.2 TS1M0 |
| Microsoft Windows 2000 Professional | 8 TS M0 | 9.2 TS1M0 |
| Microsoft Windows 2000 Server | 8 TS M0 | 9.2 TS1M0 |
| OpenVMS VAX | 8 TS M0 | |
| Microsoft Windows 2000 Advanced Server | 8 TS M0 | 9.2 TS1M0 |
| Microsoft Windows 2000 Datacenter Server | 8 TS M0 | 9.2 TS1M0 |
| 64-bit Enabled Solaris | 8 TS M0 | 9.2 TS1M0 |
| Solaris for x64 | 9.1 TS1M3 SP4 | 9.2 TS1M0 |
| Solaris | 8 TS M0 | 9.2 TS1M0 |
| IRIX | 8 TS M0 | |
| OS/2 | 8 TS M0 | |
| z/OS | 8 TS M0 | 9.2 TS1M0 |
| Linux | 8.2 TS2M0 | 9.2 TS1M0 |
| Linux on Itanium | 9.1 TS1M3 | |
| ABI+ for Intel Architecture | 8 TS M0 | |
| HP-UX | 8 TS M0 | 9.2 TS1M0 |
| HP-UX IPF | 9 TS M0 | 9.2 TS1M0 |
| OpenVMS Alpha | 8 TS M0 | 9.2 TS1M0 |
| 64-bit Enabled HP-UX | 8 TS M0 | 9.2 TS1M0 |
| CMS | 8 TS M0 | |
| 64-bit Enabled AIX | 8 TS M0 | 9.2 TS1M0 |
| Tru64 UNIX | 8 TS M0 | 9.2 TS1M0 |
| AIX | 8 TS M0 | 9.2 TS1M0 |
*
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.
| Type: | Problem Note |
| Priority: | medium |
| Topic: | SAS Reference ==> Procedures ==> SHEWHART
Analytics ==> Statistical Process Control
|
| Date Modified: | 2007-01-31 07:52:41 |
| Date Created: | 2007-01-11 10:54:31 |
