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Figure 3 N=100 individual measurements of target value 75
Individual measurements can be divided into groups and the absolute spread in each group can be
calculated and referred to as Range. The Range chart is used for examining the variation in a set of
measurements. The acceptable interval for Range is defined by Equation 5 and Equation 6, its coefficients
D
3
and D
4
are found in section 9.2.2.
P
R...RRR
R
P
++++
=
321
Equation 4 Average range
RDUCL
R 4
= RDLCL
R
3
=
Equation 5 Upper Control Limit for Ranges Equation 6 Lower Control Limit for Ranges
Index i
Measured value
0
10 20 30 40 50
3 High
70 80 90 100
70
71
72
73
74
75
76
77
78
79
80
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