Non symmetric correspondence analysis

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Description

performs a non symmetric correspondence analysis.

Usage

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dudi.nsc(df, scannf = TRUE, nf = 2)

Arguments

df

a data frame containing positive or null values

scannf

a logical value indicating whether the eigenvalues bar plot should be displayed

nf

if scannf FALSE, an integer indicating the number of kept axes

Value

Returns a list of class nsc and dudi (see dudi) containing also

N

sum of the values of the initial table

Author(s)

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

References

Kroonenberg, P. M., and Lombardo R. (1999) Nonsymmetric correspondence analysis: a tool for analysing contingency tables with a dependence structure. Multivariate Behavioral Research, 34, 367–396.

Examples

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data(housetasks)
nsc1 <- dudi.nsc(housetasks, scan = FALSE)
if(adegraphicsLoaded()) {
  g1 <- s.label(nsc1$c1, plab.cex = 1.25)
  g2 <- s.arrow(nsc1$li, add = TRUE, plab.cex = 0.75)
} else {
  s.label(nsc1$c1, clab = 1.25)
  s.arrow(nsc1$li, add.pl = TRUE, clab = 0.75) # see ref p.383
}

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