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HBOK 1-206

Title Calculated Decision
Author(s) Robert W. Sherrill and Louis A. Johnson
Source Quality Progress
Topic Performance Measurement

Data Analysis

Abstract Control charts and capability analyses created to provide proof of process control and process capability assume data follow a normal distribution, but this is not the case and standard calculations can, therefore, be incorrect. This problem can be solved by transforming data to follow the normal transformation or by using an appropriate non-normal distribution model. Calculations illustrated by an example can be used to verify process control and calculate process capability for non-normal quality characteristics.
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Reference Code 1-206

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