Quality Management 2017

A NALYZE

Control charts: Calculation of control limits

S TEP 6. C ALCULATE THE CONTROL LIMITS FOR THE I-MR CHART

MR : M oving R ange control chart

I : I ndividual value control chart

Mean of throws’

lenght per sample

MR : Range between two consecutive points

Sample number (chronological order)

Sample number (chronological order)

Excel spreadsheet:

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!

03/10/17

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