CSSGB · Question #41
Why did you use this formula versus another formula? Answer: (R÷d2) was used instead of the formula for the sample standard deviation because (R÷d2) considers only short term variation, while the form
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Question
Why did you use this formula versus another formula? Answer:
(R÷d2) was used instead of the formula for the sample standard deviation because (R÷d2) considers only short term variation, while the formula for the sample standard considers long term variation. (R÷d2) assumes that the process is stable. If the process is not stable, the out of control points will jump out of the control limits based on (R÷d2). The (R÷d2) limits are tighter than limits based on the sample standard deviation.
Options
- A(R÷d2) was used instead of the formula for the sample standard deviation because (R÷d2) considers only short term variation, while the formula for the sample standard considers long term variation. (R÷d2) assumes that the process is stable. If the process is not stable, the out of control points will jump out of the control limits based on (R÷d2). The (R÷d2) limits are tighter than limits based on the sample standard deviation.
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