Method and apparatus for statistical process control of machines and processes having non-constant mean of a response variable
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United States of America Patent
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Nov 16, 1999
Grant Date -
N/A
app pub date -
Apr 30, 1998
filing date -
Apr 30, 1998
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method and apparatus for analyzing a process or machine having a non-constant mean of a response variable using statistical process control techniques. Several measurements of a response variable are taken while the monitored machine is known to be operating in control. Through statistical regression techniques, a mathematical formula is derived to predict the value using indicator variables at various periods in the process. Then, while the process or machine is operating on an ongoing basis, actual measurements of the response variable are taken and compared to the predicted values using indicator variables calculated from the derived formula. Statistical process control rules are applied to the measured values of the response variable and the predicted value using indicator variables to determine if the machine or process has fallen out of control.
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