False Alarm probability for the 3-sigma R chart.
Used to calculate the real probability of false alarm in the 3-sigma R chart.
The sample size.
This alpha risk is calculated under the exact R statistics distribution and its values for small sample sizes will be much larger than the reference value 0,0027.
Return the value of the alpha risk for a given sample size n.
Daniela R. Recchia, Emanuel P. Barbosa
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