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%- Also NEED an '\alias' for EACH other topic documented here.
\title{ X-bar Shewhart Control Chart for phase I. }
  Builds the x-bar control chart for phase I.
cchart.Xbar1(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. }
  Even if the data is not normal the x-bar statistic will be close to the normal by the central limit theorem.
  Return a x-bar control chart for phase I.
\author{ Daniela R. Recchia, Emanuel P. Barbosa }
\seealso{ \link{cchart.Xbar2} }
cchart.Xbar1(pistonrings[1:25, ])
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