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RNANADHA
Level I

I-MR chart

When n=1, use the I-MR control chart but in that chart sigma calculated used by d2 and when we are select the d2 value as per sample size so why in that case we use d2=1.128 means d2 value of sample size 2.

 

 

 

 

 

Thanks in advance

1 REPLY 1
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P_Bartell
Level VI

Re: I-MR chart

Because the default number of observations to create each moving range data point is 2, and those 2 observations are successive wrt to the time series sequence.

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