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- Control Charts Made EASY!
- Copyright (c) 1989 Mark H. Libert
- All Rights Reserved
-
- Control Charts Made EASY! is an interactive BASIC program designed
- to let your IBM or compatable computer take the place of a hand calculator
- when making common calculations from control charts. Control charts are
- used for statistical process control throughout the manufacturing industry.
- Many companies handle SPC data electronically from measurement to computer
- generated charts. Others use partially computerized systems, or they
- perform SPC manually. Unless a system is 100% computerized and no
- calculations are made by the operator or inspector, Control Charts Made EASY!
- will simplify the use of the control chart. The chance for operator error
- is eliminated when the computer calculates a complex formula typical to
- statistics.
- Control Charts Made EASY! will calculate control limits for the
- following charts:
- _
- x & R Average and range
- median charts
- x & s Average and standard deviation
- individuals and moving range
- p charts
- c charts
- np charts
- u charts
- It will also calculate Cpk, CP, and CR for the variable data charts.
- It will calculate Cpk from mean and standard deviation, and calculate
- P-C line values for pre-control / stoplight control charts. Control Charts
- Made EASY! is simple to use, and has many features to check for errors in
- data entry or incorrect use of a chart. USE THE HELP FEATURE OFTEN when
- operating the program. There are fifteen different screens of help and
- information to assist with operation and describe the uses of each chart
- type.
- Using Control Charts Made EASY! is not difficult and each chart
- section operates in a similar fashion. Prompts for part number and check-
- point number begin each section. Entering a number or name in these places
- will cause them to be displayed with the calculated results. If you do not
- wish to enter anything in these places, simply strike the ENTER key when
- prompted. You will then be prompted to enter other information needed to
- calculate control limits for SPC charts such as subgroup size, number of
- subgroups, lot sample size etc. Once these things have been entered, the
- entering of data can begin. Prompts on the screen always help you to know
- what to do next. Once the data has been entered, control limits will be
- displayed instantly if you choose; or enter specification limits to also
- calculate and display Cpk, CP, and CR. At almost any point of the program,
- the <E> key will help you back up or get out. An E to Exit sign at
- the bottom of the screen appears most of the time. When it does not, the
- <E> key might still help out. Here's how. When entering data, mistakes can
- be made. That's normal. If you look at the screen and see you have made
- an error, enter an E in place of any next data. At that point, you have
- entered the error recovery route. You can then choose to go back to any
- point and resume. Control Charts Made EASY! does not make charts, but
- will make all the calculations needed for making SPC charts. If a hand
- calculator is ever used for control chart calculations, Faster, easier,
- more dependable results can be obtained by using the computer.
- Control Charts Made EASY! is protected under the copyright laws and
- registered with the Library of Congress. It is prohibited to edit Control
- Charts Made EASY! or distribute it for profit. You are, however, encouraged
- to distribute it freely to anyone who might benefit from its use.
-
- Libert Computer Systems 2655 Fox Rd. Greenville, OH 45331 1989
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-