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L13-14 - Chapter 13:Shewhart Control Charts for Attribute...

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Chapter 13:Shewhart Control Charts for Attribute Data Lecture 13 March, 3rd, 2008 IQC
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Outline Introduction Control charts for fraction defective (p-charts) Control charts for number of defectives Control charts for number of defects (c-charts) Control charts for number of defects per unit
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Introduction Variable measurement: Diameter in inches, weight in ounces Quality characteristics defined in “presence or absence of” sense: Cracks in drawn wire, color inconsistencies on a painted surface, wrinkles on a sheet. “Defective” or “non-defective” Conforming or non-conforming
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Important Definitions Defect: A fault or nonconformity Defective: An item with at least one defect Number of defectives Number of defects Fraction defective
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Operational Definitions Precise and quantitative operational definitions must be set down for all to observe uniformly The length or depth of a scratch Diameter of a surface blemish Product control vs. process control issues Only product control: Not all defects need to be observed Process control: Each occurrence of each defect type must be noted
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Control Chart for Fraction Defective 079 . 0
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