What is moving range chart - Definition and Meaning

Moving Range Chart :

Moving range control charts are used to determine the control and points that lie within the control limit. A typical MR chart makes use of two consecutive date points for the determination, where sub-grouping is impractical or of less benefit.


Formula :

S = √Σ(x-̄x)2/N-1 Individual chart: UCL = X̄ + 3S, LCL = X̄ - 3S Moving range chart: UCL = 3.668*MR, LCL = 0

Example :

X = (2.0,3.5,4.2,3.0,5.5) / 5
XMR
2.0-
3.52.5
4.2-1.2
3.00.7
5.51.5
Avg=3.63M̄R̄=0.875
S = 1.31 Individual chart UCL = 3.63 + (3 * 1.31) =7.56 LCL = 3.63 - (3 * 1.31) =-0.29 Moving range chart UCL = 3.668 * 0.875 =3.21 LCL = 0

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