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Gadsdon
Level III

Degrees of Freedom and control charts

Hi Is there any clever way that I can see the degrees of freedom when I create a control chart (XbarR, XbarS and Xm/Individual):

Regards Ian

3 REPLIES 3
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Byron_JMP
Staff

Re: Degrees of Freedom and control charts

Ian,

No. 

Are you thinking of the span for x-bar and R or S charts?

-B

JMP Systems Engineer, Pharm and BioPharm Sciences
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Gadsdon
Level III

Re: Degrees of Freedom and control charts

Hi Byron, this comes from work done by Wheeler (https://www.qualitydigest.com/june97/html/spctool.html). I use the tables in EMP III Evaluating the measurement process & using imperfect data (Chapt 17.6). Its applicable to Xm, XbarR etc

Regards Ian

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Re: Degrees of Freedom and control charts

These values are given in the Measurement Systems Analysis platform under the Quality menu.

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