ade4 (version 1.2-2)

dudi.coa: Correspondence Analysis

Description

performs a correspondence analysis.

Usage

dudi.coa(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 coa and dudi (see dudi) containing
• N
  the sum of all the values of the initial table

References

Benz�cri, J.P. and Coll. (1973) L'analyse des donn�es. II L'analyse des correspondances, Bordas, Paris. 1--620. Greenacre, M. J. (1984) Theory and applications of correspondence analysis, Academic Press, London.

Examples

data(rpjdl)
chisq.test(rpjdl$fau)$statistic
rpjdl.coa <- dudi.coa(rpjdl$fau, scannf = FALSE, nf = 4)
sum(rpjdl.coa$eig)*rpjdl.coa$N # the same

par(mfrow = c(1,2))
s.label(rpjdl.coa$co, clab = 0.6, lab = rpjdl$frlab)
s.label(rpjdl.coa$li, clab = 0.6)
par(mfrow = c(1,1))

data(bordeaux)
db <- dudi.coa(bordeaux, scan = FALSE)
db
score(db)