🚀 go-pugleaf

We have SPC-PCII which is perhaps the best of the available SPC packages,
BUT --  it is write-protected.   The master disk is deliberately corrupted
so that it cannot be copied - hence you cannot make a back-up.   (Yes - we
have tried some of those programs for copying such disks but it has defeated
those we tried.)   It took a long while to install, include sending a fax
to Quality America.   The installation program conflicts with TSR's and cache
programs - in our case it was fighting with FASTOPEN (we were installing
under DOS 4.01).

The strong point of SPC-PCII is that it is not wedded to the normal
distribution, as are almost all of the others.  By default it fits the
Johnson curves NOT the normal distribution, though you can select other
distributions including normal and folded normal.

The documentation is miserable for a package costing over US$1000.

The package provides for direct memory access for a number of data collectors
and I suspect that this is partly responsible for the high price.

QC is becoming available now in most statistical packages.   I have the QC
module of NCSS.   It is much easier to use than SPC-PCII, and much cheaper,
but is limited in what it can do.   It costs US$59 on top of US$125 for the
basic NCSS package.

Let me put in a plug for an Australian product (I have no connection with
the producers) called SPC 2000.   It claims to be 'unique because we believe
it is the only SPC package with a comprehensive set of sophisticated
diagnostic routines'.   It is priced at Aus$750 + postage.   At the moment
this is about US$570 + postage.   It is being marketed through two quality
organizations in Australia:
AQPS (located in Victoria)  Tel: (+61) 3 - 801-4259 (same number used for fax)
AOQ (in NSW) Tel: (+61) 2 - 746-2411 (ask for Len King)
             Fax: (+61) 2 - 746-2377