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\title{ Piston Rings Data Set. }
  The Piston Rings data set was taken from Montgomery's book. It consists of 40 samples of size 5 each of values of the diameter of the piston rings.
\usage{ data(pistonrings) }
  A data frame with 40 observations on the following 5 variables.
    \item{\code{V1}}{The fisrt measure.}
    \item{\code{V2}}{The second measure.}
    \item{\code{V3}}{The third measure.}
    \item{\code{V4}}{The fouth measure.}
    \item{\code{V5}}{The fifth measure.}
 Montgomery, D.C.,(2008)."Introduction to Statistical Quality Control".4th Ed. Wiley
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