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Range
Chart Calculations
Plotted statistic
where x1, x2, … are
the n observations in subgroup j
Center Line
Average
Range
UCL , LCL (Upper and Lower
Control Limit)
where R-bar is the Average
Range , d3 is a function of n (available in any statistical quality control
textbook), and  x
is Process Sigma, which is calculated using the Subgroup
Range .
Notes: Some authors prefer
to write this as:
where D3 and D4 are a function
of n (available in any statistical quality control textbook).
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