Control Charts for Attributes
Control Chart Tutorial
Introduction
p
chart
c
chart
Example
u
chart
Introduction
Many quality characteristics cannot be conveniently represented numerically. In such cases, each item inspected is classified as either conforming or nonconforming to the specifications on that quality characteristic. Quality characteristics of this type are called attributes. Examples are nonfunctional semiconductorchips, warped connecting rods, etc,.
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p
charts
This chart shows the fraction of nonconforming or defective product produced by a manufacturing process. It is also called the control chart for fraction nonconforming.
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c
charts
This shows the number of defects or nonconformities produced by a manufacturing process.
An
Example for construction of
c
chart
is provided.
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u
charts
This chart shows the nonconformities per unit produced by a manufacturing process.
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Control Chart Tutorial
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