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\title{ Plot of the Usual Cattell's Scree Test }

  \code{uScree} plot a usual scree test of the eigenvalues of a correlation matrix.

            x      = Eigenvalue,
            model  = "components",
            ylab   = "Eigenvalues",
            xlab   = "Components",
            main   = "Scree Plot",

  \item{Eigenvalue}{depreciated parameter: eigenvalues to analyse (not used if
                    x is used, recommended) }
  \item{x}{         numeric: a \code{vector} of eigenvalues, a \code{matrix} of
                    correlations or of covariances or a \code{data.frame} of data}
  \item{model}{     character: \code{"components"} or \code{"factors"} }
  \item{main}{      character: title of the plot   (default is \code{Scree Plot})      }
  \item{xlab}{      character: label of the x axis (default is \code{Component})  }
  \item{ylab}{      character: label of the y axis (default is \code{Eigenvalue}) }
  \item{...}{       variable: additionnal parameters to give to the \code{eigenComputes} function}

  Nothing returned with this function.

 Cattell, R. B. (1966). The scree test for the number of factors.
  \emph{Multivariate Behavioral Research, 1}, 245-276.


    Gilles Raiche \cr
    Centre sur les Applications des Modeles de Reponses aux Items (CAMRI) \cr
    Universite du Quebec a Montreal\cr
    \email{raiche.gilles@uqam.ca}, \url{http://www.er.uqam.ca/nobel/r17165/}

 eig = Cliff1$eigenvalues

\keyword{ Graphics }

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