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%- Also NEED an '\alias' for EACH other topic documented here.
\title{ False Alarm probability for the 3-sigma R chart. }
  Used to calculate the real probability of false alarm in the 3-sigma R chart.
%- maybe also 'usage' for other objects documented here.
  \item{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.
\author{ Daniela R. Recchia, Emanuel P. Barbosa }
\seealso{ \link{d2},\link{d3},\link{c4} }
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