R: Projections of Supplementary Columns

supcol {ade4} | R Documentation

## Projections of Supplementary Columns

### Description

performs projections of supplementary columns.

### Usage

    supcol(x, ...)
    ## S3 method for class 'dudi'
    supcol(x, Xsup, ...)
    ## S3 method for class 'coa'
    supcol(x, Xsup, ...)

### Arguments

`x` | an object used to select a method
`Xsup` | an array with the supplementary columns (`Xsup` and `x$tab` have the same row number)
`...` | further arguments passed to or from other methods

### Details

If `supcol.dudi` is used, the column vectors of `Xsup` are projected without prior modification onto the principal components of dudi with the scalar product associated to the row weightings of dudi.

### Value

A list of two components:

``tabsup`` | data frame containing the array with the supplementary columns transformed or not
``cosup`` | data frame containing the coordinates of the supplementary projections

### Author(s)

Daniel Chessel
Anne-Béatrice Dufour anne-beatrice.dufour@univ-lyon1.fr

### Examples

    data(rpjdl)
    rpjdl.coa <- dudi.coa(rpjdl$fau, scan = FALSE, nf = 4)
    rpjdl.coa$co[1:3, ]
    supcol(rpjdl.coa, rpjdl$fau[, 1:3])$cosup  #the same

    data(doubs)
    dudi1 <- dudi.pca(doubs$fish, scal = FALSE, scan = FALSE)
    if(adegraphicsLoaded()) {
      g1 <- s.arrow(dudi1$co, plot = FALSE)
      g2 <- s.arrow(supcol(dudi1, data.frame(scalewt(doubs$env)))$cosup, plab.cex = 2, plot = FALSE)
      G <- superpose(g1, g2, plot = TRUE)

    } else {
      s.arrow(dudi1$co)
      s.arrow(supcol(dudi1, data.frame(scalewt(doubs$env)))$cosup, add.p = TRUE, clab = 2)
      symbols(0, 0, circles = 1, inches = FALSE, add = TRUE)
    }

[Package ade4 version 1.7-18 Index]