What is the formula for the subgroup range R_i? ________ This question pertains

Question

What is the formula for the subgroup range R_i? ________
This question pertains to SPC for quality control.
Any help would be appreciated because I can't find the answer in my notes or book. What is the formula for the subgroup range R_i? ________
This question pertains to SPC for quality control.
Any help would be appreciated because I can't find the answer in my notes or book.
This question pertains to SPC for quality control.
Any help would be appreciated because I can't find the answer in my notes or book.

Explanation / Answer

Subgroup range R(i) is given by:

Biggest value in subgroup i - Smallest value in subgroup i

So find the maximum and minimum values in the subgroup, and the difference will give you the subgroup range.

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