Introduction . Data that can be classified into one of several categories or classifications is known as attribute data . Classifications such as conforming and nonconforming are commonly used in quality control. Another example of attributes data is the count of defects .
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Control Charts for Attributes
Control Charts for Attributes
Control Charts for Attributes
1. All trials are independent.
2. Each outcome is either a “success” or “failure”.
3. The probability of success on any trial is given as p. The probability of a failure is
1p.
4. The probability of a success is constant.
Control Charts for Attributes
Control Charts for Attributes
Assume
Control Charts for Attributes
where is a random variable with mean and variance
Control Charts for Attributes
Standard Given
Control Charts for Attributes
No Standard Given
where
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Trial Control Limits
Control Charts for Attributes
A process that produces bearing housings is investigated. Ten samples of size 100 are selected.
Control Charts for Attributes
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Example4Control Charts for Attributes
Control Charts for Attributes
Control Charts for Attributes
Control Charts for Attributes
Control Charts for Attributes
Control Charts for Attributes
Therefore,
Control Charts for Attributes
Control Charts for Attributes
and
Control Charts for Attributes
Control Charts for Attributes
Control Charts for Attributes
Control Charts for Attributes
(if a standard, p, is not given, use )
Control Charts for Attributes
Control Charts for Attributes
1.Variable Width Control Limits
2.Control Limits Based on Average Sample Size
3.Standardized Control Chart
Control Charts for Attributes
Control Charts for Attributes
Control Charts for Attributes
Control Charts for Attributes
Control Charts for Attributes
Control Charts for Attributes
Control Charts for Attributes
Control Charts for Attributes
Poisson Distribution
Control Charts for Attributes
Control Charts for Attributes
Control Charts for Attributes
Control Charts for Attributes
Control Charts for Attributes
Control Charts for Attributes
Control Charts for Attributes
Control Charts for Attributes
di = 100ciA + 50ciB + 10ciC + ciD
di  the number of demerits in an inspection unit
Control Charts for Attributes
where n = number of inspection units
D =
Control Charts for Attributes
Control Charts for Attributes
Control Charts for Attributes
Control Charts for Attributes
Control Charts for Attributes
Control Charts for Attributes
Control Charts for Attributes