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1985-06-24
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Lotus 1-2-3 Statistical Quality Control Programs
------------------------------------------------
Mark Horvatich
3310 Portal Dr. W. #1006
Colo. Springs, CO 80901
These programs are distributed without warranty or obligation of any
kind. You can distribute these programs as you see fit; however, they
should be distributed as a set. If you find these programs of value, a
contribution of $50 is suggested.
Here's an added bonus for your contribution: for the $50, you will
receive two additional files which will turn the individual programs
into an integrated SQC package with on-line HELP facilities. In
addition, you will be notified of any updates in the programs and will
receive them free of charge. For both of these "incentives", you will
need to send me your SQC program disc. I promise to make the
appropriate changes on the disk and have it in the mail within 48
hours. Good luck!
SQC - Page 1
Introduction
------------
Despite the vast wealth of software for the IBM PC and compatibles,
very little software exists in the area of quality control. Even worse,
what does exist is written mainly with UCSD Pascal and uses the UCSD
p-system. This is not an acceptable situation if one wants to use the
data or the output in other (MSDOS) applications, such as Lotus 1-2-3,
WordStar, or dBASE II.
Being a statistician by trade and generally working in the quality
control department, this situation had a direct impact on me. When the
situation became desperate, the SQC programs became a reality.
The SQC programs should run with any version of 1-2-3 on any computer
which supports 1-2-3. They have been tested on the IBM PC & XT, the
HP150, and the TI Professional with versions 1A and 1A*. Memory
requirements vary from machine to machine, but as a general rule, you
will need 256K of memory to run the programs.
Several new modules are being written or are being planned. The next
module will be an X-BAR/S-chart program. Planned enhancements include
the ability for the user to specify points which should not be included
in calculations. Contributors will be notified of these changes as they
occur. NOTE: I do NOT plan any BBS distribution of new programs or
enhancements - you MUST be a contributor to obtain them. The only
changes which will be distributed freely will be potential bugs in the
current SQC programs.
Due to my own limitations on hardware (after all, I'm not exactly rich,
or I wouldn't be doing this!), the enhancements will be distributed in
either IBM PC format, or on 3 1/2 inch discs in HP150 format. It will be
the responsibility of the user to convert the files to their
appropriate format. If a disc is sent in any other format, regretfully
I'll have to send the disc back to you, and I'll keep $5 of your money
to cover my time and expenses. So, PLEASE read this and remember...
SQC - Page 2
Program Descriptions
--------------------
HISTO - This program will produce histograms for up to eight
(Histogram) variables. The user has the ability to modify the way
that the histogram is displayed, or let the program
choose appropriate cutpoints for the bins. You can
create a histogram with up to 1600 data points (one
variable case), or with up to 200 data points (more than
one variable). Columns A through H in the 1-2-3
worksheet correspond to the eight possible variables. If
you have only one variable, data can be entered anywhere
in these columns - be sure to choose the appropriate
graphing option, however.
The example given in the program is a histogram of
exponentially distributed random numbers. For those who
may not know what an exponential distribution is, it can
be thought of as a decay curve; for example, radioactive
materials decay exponentially. You will notice that the
numbers change each time you perform a calculation - this
is true for every SQC program. There is a sample data
file for the HISTO program named HIST1 which contains
random numbers. You can try retrieving it and displaying
histograms of the individual columns or construct a
histogram of the entire data file.
XRCHART - This program constructs and displays several types of
(X-BAR, R, X, control charts. The user has the ability to change the
and moving control limits and center lines of the charts if the
range Charts) data warrants the change. Up to 50 subgroups can be
charted, with up to 8 data points per subgroup. If a
subgroup has no data points, i.e., no measurements were
taken that day, the program will leave a blank spot for
that subgroup on the chart to signify that no data
exists for that subgroup. A feature of the SQC programs
is the transportability of data between the programs.
The data created by the XRCHART program can be used in
the HISTO program. This allows you to make control
charts and also check the data for a normal distribution.
The sample data are random numbers between 1 and 10.
PCHART - The PCHART program will construct P-charts of up to 50
(P-Charts) data points. As with the XRCHART program, a missing data
point will not be plotted. The format and use of this
program is quite similar to the XRCHART program. The
sample data are 50 random percentages between 0 and 25%.
PARETO - The PARETO program will construct Pareto charts of up to
(Pareto 20 events. You have the choice of displaying the chart
Charts) with the raw numbers or the numbers converted to
percentages. The sample data are actual data from a chart
generated in 1983 for a drug tabletting machine.
SQC - Page 3
Using the SQC Programs
----------------------
The SQC programs are very simple to use. Since they have been
constructed with 1-2-3, knowledge of 1-2-3 is all that should be
required to use them. The programs utilize some specific features of
1-2-3 that require explanation, however.
You will quickly notice that the SQC graphs have generic titles. If you
would like to change them, simply press Ctrl-Break to remove the menus
from the screen. You will now be able to type in any 1-2-3 command;
simply type in an appropriate /GOT... command to change the graph
titles. When you have completed your customizations, save the graph,
dump it to a printer, or if the new graph is more appropriate for your
application, use the /GN command to rename the graph, and use the /FS
command to save the program with the new graph settings. The menus can
now be displayed by typing Alt-M.
When each of the programs are stopped via the QUIT menu selection, you
should get an error that a file could not be found. The reason for this
is that the SQC programs are looking for the SQC Driver that you receive
when you become a contributor. You can disregard this error, or better,
you can type Ctrl-Break to remove the menus and then exit 1-2-3 via the
/QY command. You will not damage anything either way.
That's it. Good luck, and I hope to hear from you.
Mark Horvatich