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- Lotus 1-2-3 Statistical Quality Control Programs
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- Mark Horvatich
- 3310 Portal Dr. W. #1006
- Colo. Springs, CO 80901
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- 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
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- Program Descriptions
- --------------------
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- 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.
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- 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.
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- 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.
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- 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%.
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- 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
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- Using the SQC Programs
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- 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.
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- 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.
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- 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
-