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Interpreting Control Charts
Control charts fall into two
categories: Variable and Attribute Control Charts.
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Variable data
are data that can be measured on a continuous scale such as a
thermometer, a weighing scale, or a tape rule.
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Attribute data are
data that are counted, for example, as good or defective, as
possessing or not possessing a particular characteristic.
The type
of control chart you use will depend on the type of data you are
working with.
It is always preferable to use variable data.
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Variable data will provide better information about the process than
attribute data.
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Additionally, variable data require fewer samples
to draw meaningful conclusions.
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