supcol {ade4} | R Documentation

## Projections of Supplementary Columns

### Description

performs projections of supplementary columns.

### Usage

    supcol(x, ...)
    supcol.default (x, Xsup, ...)
    supcol.coa (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.default` 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

returns 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 chessel@biomserv.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$poi, scal = FALSE, scan = FALSE)
    s.arrow(dudi1$co)
    s.arrow(supcol.default(dudi1,data.frame(scalewt(doubs$mil)))$cosup,
        add.p = TRUE, clab = 2)
    symbols(0, 0, circles = 1, inches = FALSE, add = TRUE)

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