When control limits are computed from the input data, four methods are available for estimating the process standard deviation . Three methods (referred to as the default, MVLUE, and RMSDF) are ...
A SIMPLE graphical method of calculating standard deviations has been described by Dr. B. Woolf 1. It is sometimes useful, as a means of estimating short-term variations in a process or product, as ...
When control limits are computed from the input data, three methods (referred to as default, MAD and MMR) are available for estimating the process standard deviation .
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