SAS/QC 12.3 is essentially a maintenance release of SAS/QC software that runs on SAS 9.4.
For more information, see the software product page for SAS/QC.
SAS/QC 13.1 is a major release that runs on the first maintenance release of SAS 9.4 and later releases.
Here are some of the new features and enhancements:
The CAPABILITY procedure now provides the following:
improved parameter estimation for the Johnson SU distribution
support for the OVERLAY option, which overlays, onto a single plot, histograms that are associated with different levels of a CLASS variable
The MVPMONITOR procedure supports the new SCORECHART statement, which produces control charts of principal component score. ...