16Control Chart PlatformShewhart Control Charts for Attributes371
16Quality Control with Control Charts
Attribute charts, like variables charts, are classified according to the subgroup sample statistic plotted
on the chart:
•p-charts display the proportion of nonconforming (defective) items in subgroup samples which can
vary in size. Since each subgroup for a P-chart consists of N
i
items, and an item is judged as either
conforming or nonconforming, the maximum number of nonconforming items in a subgroup is
N
i
.
•np-charts display the number of nonconforming (defective) items in subgroup samples. Since each
subgroup for a NP-chart consists ...
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