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A
NALYZE
Control charts: Calculation of control limits
S
TEP
6. C
ALCULATE THE CONTROL LIMITS FOR THE
I-MR
CHART
Nb of data (Means/sample) Xbar=Mean of Means/sample Rbar=Mean of MR
=
Rbar/d2
Data used to calculate the control charts' limits =
Samples 1 to 10 :
0
#DIV/0!
#DIV/0!
#DIV/0!
I :
I
ndividual value control chart
MR :
M
oving
R
ange control chart
Mean of throws’
lenght per sample
Sample number (chronological order)
MR : Range between two
consecutive points
Sample number (chronological order)
Excel spreadsheet:
03/10/17
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