There is a single observation for each batch. The variable BATCH identifies the subgroup sample and is referred to as the subgroup-variable. The variable FAIL contains the number of nonconforming ...
Control charts have two general uses in an improvement project. Undeniably, the most common application is as a tool to ...
The previous example illustrates how you can create np charts using raw data (counts of nonconforming items). However, in many applications, the data are provided in summarized form as proportions or ...
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