Problem Note 9036: OUTHISTOGRAM= and low-res plot may be incorrect with specs far from data
When an OUTHISTOGRAM= data set is specified on the HISTOGRAM statement
in PROC CAPABILITY, specification limits that are far away from the data
are used and the NOPLOT option is specified, then the OUTHISTOGRAM= data
set may contain incorrect values for the variables _MIDPT_ and _OBSPCT_.
The data set may contain observed percents at midpoints where no data
values actually exist. If instead of the NOPLOT option, a low resolution
graph is specified with the LINEPRINTER or LP option, then the histogram
bars may also be incorrect. The bars may be drawn where no data points
exist.
There is no way to predict with certainty when this problem will occur,
but it only happens with spec limits that are many multiples of the data
range away from the data. To avoid the problem, either generate a
high-resolution histogram along with the OUTHISTOGRAM= data set or omit
the spec limits that are too far from the data.
Operating System and Release Information
| SAS System | SAS/QC | Microsoft Windows XP Professional | 8.2 TS2M0 | 9.1 TS1M0 |
| Microsoft Windows NT Workstation | 8 TS M0 | 9.1 TS1M0 |
| Microsoft Windows 95/98 | 8 TS M0 | |
| Windows Millennium Edition (Me) | 8.2 TS2M0 | |
| Microsoft® Windows® for 64-Bit Itanium-based Systems | 9 TS M0 | 9.1 TS1M0 |
| Microsoft Windows 2000 Server | 8 TS M0 | 9.1 TS1M0 |
| Microsoft Windows 2000 Datacenter Server | 8 TS M0 | 9.1 TS1M0 |
| Microsoft Windows 2000 Professional | 8 TS M0 | 9.1 TS1M0 |
| Microsoft Windows 2000 Advanced Server | 8 TS M0 | 9.1 TS1M0 |
| 64-bit Enabled Solaris | 8 TS M0 | |
| OpenVMS VAX | 8 TS M0 | |
| Solaris | 8 TS M0 | |
| IRIX | 8 TS M0 | |
| OS/2 | 8 TS M0 | |
| z/OS | 8 TS M0 | 9.1 TS1M0 |
| ABI+ for Intel Architecture | 8 TS M0 | |
| Linux | 8.2 TS2M0 | 9.1 TS1M0 |
| HP-UX | 8 TS M0 | |
| 64-bit Enabled HP-UX | 8 TS M0 | |
| HP-UX IPF | 9 TS M0 | 9.1 TS1M0 |
| OpenVMS Alpha | 8 TS M0 | 9.1 TS1M0 |
| CMS | 8 TS M0 | |
| AIX | 8 TS M0 | |
| Tru64 UNIX | 8 TS M0 | 9.1 TS1M0 |
| 64-bit Enabled AIX | 8 TS M0 | |
*
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: | alert |
| Topic: | Analytics ==> Distribution Analysis
SAS Reference ==> Procedures ==> CAPABILITY
Analytics ==> Descriptive Statistics
Analytics ==> Process Capability Analysis
|
| Date Modified: | 2002-12-23 12:48:04 |
| Date Created: | 2002-12-11 09:56:40 |
