R Chart with probability limits

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The discussion centers on calculating control limits for X and R charts using probability limits with a specified alpha level of 0.002 and a sample size of 5. The value of W is crucial, with W0.999 given as 5.483754 and W0.001 as 0.367392. Participants seek clarification on the source of these W values and how to determine the R limits. The solution provided indicates using W1 - α/2 to find the appropriate W value. Understanding the reference table for these calculations is essential for accurate charting.
abhipatel
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Am all confused...W is the relative range right?
Where do we get the value of W from - which table... proff got
W0.999 = 5.483754 & W 0.001 = 0.367392
(Que: Suppose we want to use probability limits with α = 0.002...sample size is 5)
Please help & explain.
 
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I have no idea what you are talking about. Please try and formulate your question in a more understandable way.
 
Suppose we want to use probability limits with α = 0.002. What are the control limits for theX and R charts?

Sample size is 5...All I want is how do we calculate R limits

Solution : W 1 - α/2 = W0.999 = 5.483754

Just want to know what table he has referred to get this answer?
 

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