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77
7Specications
No. 99MAM029A
Print Meaning Calculation formula
X¯ Subgroup average value X¯ = ΣXi/N
R Subgroup range R = Xmax - Xmin
X
=
Center value X
=
= ΣXi/N
X¯ - U C L Upper control limit X¯-UCL = X¯ + A2 • R¯
X¯ - L C L Lower control limit X¯-LCL = X¯ + A2 • R¯
R¯ Center (R control) R¯ = ΣRi/n
R¯ - U C L Upper control limit (R control) R¯-UCL = D4 • R¯
R¯ - L C L *
1
Lower control limit (R control) R¯-LCL = D3 • R¯
*
1
In case the number of samples is below 6, R¯-LCL is not printed.