CHAPTER 4

Basic Control Charts for Variables

The idea of control involves action for the purpose of achieving a desired end.

—Walter Shewhart

Data used to create SPC control charts can be divided into two basic types: attributes and variables. Attribute data are go/no-go or count information. Examples include the number of defective units, the number of complaints received from dissatisfied customers, and the number of patients whose meals were delivered more than 15 minutes late. Control charts for attribute data will be the subject of Chapter 6. Variable data are continuous measurement information. Examples include measurements of height, weight, length, concentration, and pressure (psig). Control charts for variable data are the subject of ...

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