Defects are not free. Somebody makes them, and gets paid for making them.
—W. Edwards Deming
The previous two chapters discussed control charts for variable data, which are continuous measurement information such as height, weight, length, concentration, and pressure. This chapter discusses control charts for attribute data that are go/no-go or count information. Examples include the number of defective units, the number of defects in a unit, the number of complaints received from dissatisfied customers, and the number of patients whose meals were delivered more than 15 minutes late. The theory supporting control charts for attributes is the same as has been discussed in Chapter 3. However, while the ...
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