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Unformatted text preview: Chapter 13:Shewhart Control Charts for Attribute Data Lecture 13 March, 3rd, 2008 IQC Outline Introduction Control charts for fraction defective (pcharts) Control charts for number of defectives Control charts for number of defects (ccharts) Control charts for number of defects per unit 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 “nondefective” Conforming or nonconforming Important Definitions Defect: A fault or nonconformity Defective: An item with at least one defect Number of defectives Number of defects Fraction defective 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 Control Chart for Fraction Defective 079 ....
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This note was uploaded on 04/07/2008 for the course ERROR Error taught by Professor Error during the Fall '08 term at University of Illinois at Urbana–Champaign.
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