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VMs: Process control method

It was easier to find than I thought. One example is here, look at the two
pictures. I think the UCL and LCL calculation can also be applied to the VMS
text properties like word length etc.:


According to the definition of "in control", the process should meet four
1.  No sample points outside of process limits
2.  Most points near average
3.  Nearly equal number of points above and below average
4.  Points are randomly distributed

According to Figure1, only conditions 3 and 4 are being met.  This process
should be examined for process upsets or interruptions in stability.

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