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%- Also NEED an '\alias' for EACH other topic documented here.
\title{ X-bar and R control charts }
  This function builds the X-bar and R control charts in the same window.
cchart.Xbar_R(x, sizes)
%- maybe also 'usage' for other objects documented here.
  \item{x}{ The data to be plotted. }
  \item{sizes}{ A value or a vector of values specifying the sample sizes associated with each group. }
  Return the two control charts.
\author{ Daniela R. Recchia, Emanuel P. Barbosa. }
cchart.Xbar_R(pistonrings[1:25, ])
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