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1989-12-28
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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