Used to calculate the real probability of false alarm in the 3-sigma R chart.

1 | ```
alpha.risk(n)
``` |

`n` |
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

d2,d3,c4

1 | ```
alpha.risk(15)
``` |

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